diff --git a/.github/workflows/build-gems.yml b/.github/workflows/build-gems.yml
index 3573c8c6..0c1b72cf 100644
--- a/.github/workflows/build-gems.yml
+++ b/.github/workflows/build-gems.yml
@@ -27,8 +27,8 @@ jobs:
       - name: Setup Ruby and Rust
         uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
-          ruby-version: "3.4"
-          bundler-cache: true
+          ruby-version: "4.0"
+          bundler-cache: false # Needed so 'bundler install' doesn't run
           cargo-cache: true
           cargo-vendor: true
           working-directory: ./temporalio
@@ -41,7 +41,8 @@ jobs:
         id: cross-gem
         working-directory: ./temporalio
         run: |
-          bundle exec rb-sys-dock --platform ${{ matrix.rubyPlatform }} --ruby-versions "3.2,3.3,3.4" --mount-toolchains --build
+          gem install rb_sys --no-document
+          rb-sys-dock --platform ${{ matrix.rubyPlatform }} --ruby-versions "3.3,3.4,4.0" --mount-toolchains --build
           echo "gem-path=$(find pkg -name '*-${{ matrix.rubyPlatform }}.gem')" >> $GITHUB_OUTPUT
 
       - name: Upload gem
@@ -62,7 +63,7 @@ jobs:
       - name: Setup Ruby and Rust
         uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
           cargo-cache: true
           cache-version: v1-source
@@ -96,7 +97,7 @@ jobs:
         #   does not have updated certificates and it is not easy to update them, see
         #   https://github.com/temporalio/sdk-ruby/issues/306
         os: [ubuntu-latest, macos-latest]
-        rubyVersion: ["3.2", "3.3", "3.4"]
+        rubyVersion: ["3.3", "3.4", "4.0"]
         # Container defaults to empty/none, but additional container for Alpine
         # added later
         container: [""]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7572a45c..a38369e0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,11 +21,11 @@ jobs:
         # https://github.com/temporalio/sdk-ruby/issues/172
         os: [ubuntu-latest, macos-latest]
         # Earliest and latest supported
-        rubyVersion: ["3.2", "3.4"]
+        rubyVersion: ["3.3", "4.0"]
         
         include:
           - os: ubuntu-latest
-            rubyVersion: "3.4"
+            rubyVersion: "4.0"
             checkTarget: true
             docsTarget: true
     runs-on: ${{ matrix.os }}
diff --git a/temporalio/.rubocop.yml b/temporalio/.rubocop.yml
index 39551e8f..d4ab54a4 100644
--- a/temporalio/.rubocop.yml
+++ b/temporalio/.rubocop.yml
@@ -4,7 +4,7 @@ inherit_mode:
 
 AllCops:
   NewCops: enable
-  TargetRubyVersion: 3.2
+  TargetRubyVersion: 3.3
   SuggestExtensions: false
   Exclude:
     - ext/**/*
diff --git a/temporalio/Cargo.lock b/temporalio/Cargo.lock
index 90094c7b..38c769d5 100644
--- a/temporalio/Cargo.lock
+++ b/temporalio/Cargo.lock
@@ -190,11 +190,11 @@ dependencies = [
 
 [[package]]
 name = "axum"
-version = "0.8.7"
+version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b098575ebe77cb6d14fc7f32749631a6e44edbef6b796f89b020e99ba20d425"
+checksum = "8b52af3cb4058c895d37317bb27508dccc8e5f2d39454016b297bf4a400597b8"
 dependencies = [
- "axum-core 0.5.5",
+ "axum-core 0.5.6",
  "bytes",
  "futures-util",
  "http",
@@ -235,9 +235,9 @@ dependencies = [
 
 [[package]]
 name = "axum-core"
-version = "0.5.5"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59446ce19cd142f8833f856eb31f3eb097812d1479ab224f54d72428ca21ea22"
+checksum = "08c78f31d7b1291f7ee735c1c6780ccde7785daae9a9206026862dab7d8792d1"
 dependencies = [
  "bytes",
  "futures-core",
@@ -333,9 +333,9 @@ dependencies = [
 
 [[package]]
 name = "bumpalo"
-version = "3.19.0"
+version = "3.19.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
+checksum = "5dd9dc738b7a8311c7ade152424974d8115f2cdad61e8dab8dac9f2362298510"
 
 [[package]]
 name = "byteorder"
@@ -366,9 +366,9 @@ checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
 
 [[package]]
 name = "cc"
-version = "1.2.48"
+version = "1.2.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c481bdbf0ed3b892f6f806287d72acd515b352a4ec27a208489b8c1bc839633a"
+checksum = "7a0aeaff4ff1a90589618835a598e545176939b97874f7abc7851caa0618f203"
 dependencies = [
  "find-msvc-tools",
  "jobserver",
@@ -447,9 +447,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.53"
+version = "4.5.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9e340e012a1bf4935f5282ed1436d1489548e8f72308207ea5df0e23d2d03f8"
+checksum = "c6e6ff9dcd79cff5cd969a17a545d79e84ab086e444102a591e288a8aa3ce394"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -457,9 +457,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.53"
+version = "4.5.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d76b5d13eaa18c901fd2f7fca939fefe3a0727a953561fefdf3b2922b8569d00"
+checksum = "fa42cf4d2b7a41bc8f663a7cab4031ebafa1bf3875705bfaf8466dc60ab52c00"
 dependencies = [
  "anstream",
  "anstyle",
@@ -775,18 +775,18 @@ dependencies = [
 
 [[package]]
 name = "derive_more"
-version = "2.1.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10b768e943bed7bf2cab53df09f4bc34bfd217cdb57d971e769874c9a6710618"
+checksum = "d751e9e49156b02b44f9c1815bcb94b984cdcc4396ecc32521c739452808b134"
 dependencies = [
  "derive_more-impl",
 ]
 
 [[package]]
 name = "derive_more-impl"
-version = "2.1.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d286bfdaf75e988b4a78e013ecd79c581e06399ab53fbacd2d916c2f904f30b"
+checksum = "799a97264921d8623a957f6c3b9011f3b5492f557bbb7a5a19b7fa6d06ba8dcb"
 dependencies = [
  "convert_case",
  "proc-macro2",
@@ -931,9 +931,9 @@ dependencies = [
 
 [[package]]
 name = "find-msvc-tools"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a3076410a55c90011c298b04d0cfa770b00fa04e1e3c97d3f6c9de105a03844"
+checksum = "645cbb3a84e60b7531617d5ae4e57f7e27308f6445f5abf653209ea76dec8dff"
 
 [[package]]
 name = "fixedbitset"
@@ -943,13 +943,13 @@ checksum = "1d674e81391d1e1ab681a28d99df07927c6d4aa5b027d7da16ba32d1d21ecd99"
 
 [[package]]
 name = "flate2"
-version = "1.1.7"
+version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2152dbcb980c05735e2a651d96011320a949eb31a0c8b38b72645ce97dec676"
+checksum = "bfe33edd8e85a12a67454e37f8c75e730830d83e313556ab9ebf9ee7fbeb3bfb"
 dependencies = [
  "crc32fast",
+ "libz-rs-sys",
  "miniz_oxide",
- "zlib-rs",
 ]
 
 [[package]]
@@ -1130,9 +1130,9 @@ checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
 
 [[package]]
 name = "governor"
-version = "0.10.2"
+version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e23d5986fd4364c2fb7498523540618b4b8d92eec6c36a02e565f66748e2f79"
+checksum = "9efcab3c1958580ff1f25a2a41be1668f7603d849bb63af523b208a3cc1223b8"
 dependencies = [
  "cfg-if",
  "dashmap",
@@ -1153,9 +1153,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.4.12"
+version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3c0b69cfcb4e1b9f1bf2f53f95f766e4661169728ec61cd3fe5a0166f2d1386"
+checksum = "2f44da3a8150a6703ed5d34e164b875fd14c2cdab9af1252a9a1020bde2bdc54"
 dependencies = [
  "atomic-waker",
  "bytes",
@@ -1399,9 +1399,9 @@ checksum = "7aedcccd01fc5fe81e6b489c15b247b8b0690feb23304303a9e560f37efc560a"
 
 [[package]]
 name = "icu_properties"
-version = "2.1.1"
+version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e93fcd3157766c0c8da2f8cff6ce651a31f0810eaa1c51ec363ef790bbb5fb99"
+checksum = "020bfc02fe870ec3a66d93e677ccca0562506e5872c650f893269e08615d74ec"
 dependencies = [
  "icu_collections",
  "icu_locale_core",
@@ -1413,9 +1413,9 @@ dependencies = [
 
 [[package]]
 name = "icu_properties_data"
-version = "2.1.1"
+version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02845b3647bb045f1100ecd6480ff52f34c35f82d9880e029d329c21d1054899"
+checksum = "616c294cf8d725c6afcd8f55abc17c56464ef6211f9ed59cccffe534129c77af"
 
 [[package]]
 name = "icu_provider"
@@ -1505,9 +1505,9 @@ checksum = "469fb0b9cefa57e3ef31275ee7cacb78f2fdca44e4765491884a2b119d4eb130"
 
 [[package]]
 name = "iri-string"
-version = "0.7.9"
+version = "0.7.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f867b9d1d896b67beb18518eda36fdb77a32ea590de864f1325b294a6d14397"
+checksum = "c91338f0783edbd6195decb37bae672fd3b165faffb89bf7b9e6942f8b1a731a"
 dependencies = [
  "memchr",
  "serde",
@@ -1548,9 +1548,9 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "1.0.15"
+version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
+checksum = "92ecc6618181def0457392ccd0ee51198e065e016d1d527a7ac1b6dc7c1f09d2"
 
 [[package]]
 name = "jobserver"
@@ -1592,9 +1592,9 @@ checksum = "2c4a545a15244c7d945065b5d392b2d2d7f21526fba56ce51467b06ed445e8f7"
 
 [[package]]
 name = "libc"
-version = "0.2.178"
+version = "0.2.179"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37c93d8daa9d8a012fd8ab92f088405fb202ea0b6ab73ee2482ae66af4f42091"
+checksum = "c5a2d376baa530d1238d133232d15e239abad80d05838b4b59354e5268af431f"
 
 [[package]]
 name = "libloading"
@@ -1608,13 +1608,22 @@ dependencies = [
 
 [[package]]
 name = "libredox"
-version = "0.1.10"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "416f7e718bdb06000964960ffa43b4335ad4012ae8b99060261aa4a8088d5ccb"
+checksum = "3d0b95e02c851351f877147b7deea7b1afb1df71b63aa5f8270716e0c5720616"
 dependencies = [
  "bitflags",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.7.0",
+]
+
+[[package]]
+name = "libz-rs-sys"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c10501e7805cee23da17c7790e59df2870c0d4043ec6d03f67d31e2b53e77415"
+dependencies = [
+ "zlib-rs",
 ]
 
 [[package]]
@@ -1681,9 +1690,9 @@ checksum = "112b39cec0b298b6c1999fee3e31427f74f676e4cb9879ed1a121b43661a4154"
 
 [[package]]
 name = "magnus"
-version = "0.7.1"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d87ae53030f3a22e83879e666cb94e58a7bdf31706878a0ba48752994146dab"
+checksum = "3b36a5b126bbe97eb0d02d07acfeb327036c6319fd816139a49824a83b7f9012"
 dependencies = [
  "magnus-macros",
  "rb-sys",
@@ -1693,9 +1702,9 @@ dependencies = [
 
 [[package]]
 name = "magnus-macros"
-version = "0.6.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5968c820e2960565f647819f5928a42d6e874551cab9d88d75e3e0660d7f71e3"
+checksum = "47607461fd8e1513cb4f2076c197d8092d921a1ea75bd08af97398f593751892"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1812,9 +1821,9 @@ checksum = "38bf9645c8b145698bb0b18a4637dcacbc421ea49bef2317e4fd8065a387cf21"
 
 [[package]]
 name = "ntapi"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8a3895c6391c39d7fe7ebc444a87eb2991b2a0bc718fdabd071eec617fc68e4"
+checksum = "c70f219e21142367c70c0b30c6a9e3a14d55b4d12a204d897fbec83a0363f081"
 dependencies = [
  "winapi",
 ]
@@ -1876,9 +1885,9 @@ checksum = "d6790f58c7ff633d8771f42965289203411a5e5c68388703c06e14f24770b41e"
 
 [[package]]
 name = "openssl-probe"
-version = "0.1.6"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d05e27ee213611ffe7d6348b942e8f942b37114c00cc03cec254295a4a17852e"
+checksum = "9f50d9b3dabb09ecd771ad0aa242ca6894994c130308ca3d7684634df8037391"
 
 [[package]]
 name = "opentelemetry"
@@ -1980,7 +1989,7 @@ checksum = "2621685985a2ebf1c516881c026032ac7deafcda1a2c9b7850dc81e3dfcb64c1"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.5.18",
  "smallvec",
  "windows-link 0.2.1",
 ]
@@ -2078,9 +2087,9 @@ dependencies = [
 
 [[package]]
 name = "portable-atomic"
-version = "1.11.1"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f84267b20a16ea918e43c6a88433c2d54fa145c92a811b5b047ccbe153674483"
+checksum = "f89776e4d69bb58bc6993e99ffa1d11f228b839984854c7daeb5d37f87cbe950"
 
 [[package]]
 name = "portable-atomic-util"
@@ -2156,9 +2165,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.103"
+version = "1.0.105"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ee95bc4ef87b8d5ba32e8b7714ccc834865276eab0aed5c9958d00ec45f49e8"
+checksum = "535d180e0ecab6268a3e718bb9fd44db66bbbc256257165fc699dadf70d16fe7"
 dependencies = [
  "unicode-ident",
 ]
@@ -2422,9 +2431,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.42"
+version = "1.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a338cc41d27e6cc6dce6cefc13a0729dfbb81c262b1f519331575dd80ef3067f"
+checksum = "dc74d9a594b72ae6656596548f56f667211f8a97b3d4c3d467150794690dc40a"
 dependencies = [
  "proc-macro2",
 ]
@@ -2525,18 +2534,18 @@ dependencies = [
 
 [[package]]
 name = "rb-sys"
-version = "0.9.119"
+version = "0.9.124"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4519fc8de033923105f512c504a8f27714ef38648ccc30969362194c50b2ed08"
+checksum = "c85c4188462601e2aa1469def389c17228566f82ea72f137ed096f21591bc489"
 dependencies = [
  "rb-sys-build",
 ]
 
 [[package]]
 name = "rb-sys-build"
-version = "0.9.119"
+version = "0.9.124"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e0109499e06c85f56df4abad7d9c642ea8a2dd821d1d7132b4d1b69534677f3"
+checksum = "568068db4102230882e6d4ae8de6632e224ca75fe5970f6e026a04e91ed635d3"
 dependencies = [
  "bindgen",
  "lazy_static",
@@ -2549,9 +2558,9 @@ dependencies = [
 
 [[package]]
 name = "rb-sys-env"
-version = "0.1.2"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a35802679f07360454b418a5d1735c89716bde01d35b1560fc953c1415a0b3bb"
+checksum = "08f8d2924cf136a1315e2b4c7460a39f62ef11ee5d522df9b2750fab55b868b6"
 
 [[package]]
 name = "redox_syscall"
@@ -2562,6 +2571,15 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f3fe0889e69e2ae9e41f4d6c4c0181701d00e4697b356fb1f74173a5e0ee27"
+dependencies = [
+ "bitflags",
+]
+
 [[package]]
 name = "redox_users"
 version = "0.5.2"
@@ -2610,9 +2628,9 @@ checksum = "ba39f3699c378cd8970968dcbff9c43159ea4cfbd88d43c00b22f2ef10a435d2"
 
 [[package]]
 name = "reqwest"
-version = "0.12.24"
+version = "0.12.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d0946410b9f7b082a427e4ef5c8ff541a88b357bc6c637c40db3a68ac70a36f"
+checksum = "eddd3ca559203180a307f12d114c268abf583f59b03cb906fd0b3ff8646c1147"
 dependencies = [
  "base64 0.22.1",
  "bytes",
@@ -2737,9 +2755,9 @@ dependencies = [
 
 [[package]]
 name = "rustix"
-version = "1.1.2"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cd15f8a2c5551a84d56efdc1cd049089e409ac19a3072d5037a17fd70719ff3e"
+checksum = "146c9e247ccc180c1f61615433868c99f3de3ae256a30a43b49f67c2d9171f34"
 dependencies = [
  "bitflags",
  "errno",
@@ -2750,9 +2768,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.35"
+version = "0.23.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "533f54bc6a7d4f647e46ad909549eda97bf5afc1585190ef692b4286b198bd8f"
+checksum = "c665f33d38cea657d9614f766881e4d510e0eda4239891eea56b4cadcf01801b"
 dependencies = [
  "log",
  "once_cell",
@@ -2765,9 +2783,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-native-certs"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9980d917ebb0c0536119ba501e90834767bffc3d60641457fd84a1f3fd337923"
+checksum = "612460d5f7bea540c490b2b6395d8e34a953e52b491accd6c86c8164c5932a63"
 dependencies = [
  "openssl-probe",
  "rustls-pki-types",
@@ -2777,9 +2795,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-pki-types"
-version = "1.13.1"
+version = "1.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "708c0f9d5f54ba0272468c1d306a52c495b31fa155e91bc25371e6df7996908c"
+checksum = "21e6f2ab2928ca4291b86736a8bd920a277a399bba1589409d72154ff87c1282"
 dependencies = [
  "web-time",
  "zeroize",
@@ -2804,9 +2822,9 @@ checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
 [[package]]
 name = "ryu"
-version = "1.0.20"
+version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
+checksum = "a50f4cf475b65d88e057964e0e9bb1f0aa9bbb2036dc65c64596b42932536984"
 
 [[package]]
 name = "same-file"
@@ -2899,22 +2917,22 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.145"
+version = "1.0.149"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "402a6f66d8c709116cf22f558eab210f5a50187f702eb4d7e5ef38d9a7f1c79c"
+checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
 dependencies = [
  "itoa",
  "memchr",
- "ryu",
  "serde",
  "serde_core",
+ "zmij",
 ]
 
 [[package]]
 name = "serde_spanned"
-version = "1.0.3"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e24345aa0fe688594e73770a5f6d1b216508b4f93484c0026d521acd30134392"
+checksum = "f8bbf91e5a4d6315eee45e704372590b30e260ee83af6639d64557f51b067776"
 dependencies = [
  "serde_core",
 ]
@@ -2942,9 +2960,9 @@ dependencies = [
 
 [[package]]
 name = "shell-words"
-version = "1.1.0"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24188a676b6ae68c3b2cb3a01be17fbf7240ce009799bb56d5b1409051e78fde"
+checksum = "dc6fe69c597f9c37bfeeeeeb33da3530379845f10be461a66d16d03eca2ded77"
 
 [[package]]
 name = "shlex"
@@ -2954,18 +2972,19 @@ checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
 [[package]]
 name = "signal-hook-registry"
-version = "1.4.7"
+version = "1.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7664a098b8e616bdfcc2dc0e9ac44eb231eedf41db4e9fe95d8d32ec728dedad"
+checksum = "c4db69cba1110affc0e9f7bcd48bbf87b3f4fc7c61fc9155afd4c469eb3d6c1b"
 dependencies = [
+ "errno",
  "libc",
 ]
 
 [[package]]
 name = "simd-adler32"
-version = "0.3.7"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d66dc143e6b11c1eddc06d5c423cfc97062865baf299914ab64caa38182078fe"
+checksum = "e320a6c5ad31d271ad523dcf3ad13e2767ad8b1cb8f047f75a8aeaf8da139da2"
 
 [[package]]
 name = "siphasher"
@@ -2981,9 +3000,9 @@ checksum = "7a2ae44ef20feb57a68b23d846850f861394c2e02dc425a50098ae8c90267589"
 
 [[package]]
 name = "slotmap"
-version = "1.0.7"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dbff4acf519f630b3a3ddcfaea6c06b42174d9a44bc70c620e9ed1649d58b82a"
+checksum = "bdd58c3c93c3d278ca835519292445cb4b0d4dc59ccfdf7ceadaab3f8aeb4038"
 dependencies = [
  "version_check",
 ]
@@ -3043,9 +3062,9 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
 name = "syn"
-version = "2.0.111"
+version = "2.0.113"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "390cc9a294ab71bdb1aa2e99d13be9c753cd2d7bd6560c77118597410c4d2e87"
+checksum = "678faa00651c9eb72dd2020cbdf275d92eccb2400d568e419efdd64838145cb4"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3105,9 +3124,9 @@ checksum = "591ef38edfb78ca4771ee32cf494cb8771944bee237a9b91fc9c1424ac4b777b"
 
 [[package]]
 name = "tempfile"
-version = "3.23.0"
+version = "3.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d31c77bdf42a745371d260a26ca7163f1e0924b64afa0b688e61b5a9fa02f16"
+checksum = "655da9c7eb6305c55742045d5a8d2037996d61d8de95806335c7c86ce0f82e9c"
 dependencies = [
  "fastrand",
  "getrandom 0.3.4",
@@ -3403,9 +3422,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.48.0"
+version = "1.49.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff360e02eab121e0bc37a2d3b4d4dc622e6eda3a8e5253d5435ecf5bd4c68408"
+checksum = "72a2903cd7736441aac9df9d7688bd0ce48edccaadf181c3b90be801e81d3d86"
 dependencies = [
  "bytes",
  "libc",
@@ -3442,9 +3461,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-stream"
-version = "0.1.17"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eca58d7bba4a75707817a2c44174253f9236b2d5fbd055602e9d5c07c139a047"
+checksum = "32da49809aab5c3bc678af03902d4ccddea2a87d028d86392a4b1560c6906c70"
 dependencies = [
  "futures-core",
  "pin-project-lite",
@@ -3453,9 +3472,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.7.17"
+version = "0.7.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2efa149fe76073d6e8fd97ef4f4eca7b67f599660115591483572e406e165594"
+checksum = "9ae9cec805b01e8fc3fd2fe289f89149a9b66dd16786abd8b19cfa7b48cb0098"
 dependencies = [
  "bytes",
  "futures-core",
@@ -3466,9 +3485,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.9.8"
+version = "0.9.10+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0dc8b1fb61449e27716ec0e1bdf0f6b8f3e8f6b05391e8497b8b6d7804ea6d8"
+checksum = "0825052159284a1a8b4d6c0c86cbc801f2da5afd2b225fa548c72f2e74002f48"
 dependencies = [
  "indexmap 2.12.1",
  "serde_core",
@@ -3481,18 +3500,18 @@ dependencies = [
 
 [[package]]
 name = "toml_datetime"
-version = "0.7.3"
+version = "0.7.5+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2cdb639ebbc97961c51720f858597f7f24c4fc295327923af55b74c3c724533"
+checksum = "92e1cfed4a3038bc5a127e35a2d360f145e1f4b971b551a2ba5fd7aedf7e1347"
 dependencies = [
  "serde_core",
 ]
 
 [[package]]
 name = "toml_edit"
-version = "0.23.7"
+version = "0.23.10+spec-1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6485ef6d0d9b5d0ec17244ff7eb05310113c3f316f2d14200d4de56b3cb98f8d"
+checksum = "84c8b9f757e028cee9fa244aea147aab2a9ec09d5325a9b01e0a49730c2b5269"
 dependencies = [
  "indexmap 2.12.1",
  "toml_datetime",
@@ -3502,18 +3521,18 @@ dependencies = [
 
 [[package]]
 name = "toml_parser"
-version = "1.0.4"
+version = "1.0.6+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0cbe268d35bdb4bb5a56a2de88d0ad0eb70af5384a99d648cd4b3d04039800e"
+checksum = "a3198b4b0a8e11f09dd03e133c0280504d0801269e9afa46362ffde1cbeebf44"
 dependencies = [
  "winnow",
 ]
 
 [[package]]
 name = "toml_writer"
-version = "1.0.4"
+version = "1.0.6+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df8b2b54733674ad286d16267dcfc7a71ed5c776e4ac7aa3c3e2561f7c637bf2"
+checksum = "ab16f14aed21ee8bfd8ec22513f7287cd4a91aa92e44edfe2c17ddd004e92607"
 
 [[package]]
 name = "tonic"
@@ -3552,7 +3571,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb7613188ce9f7df5bfe185db26c5814347d110db17920415cf2fbcad85e7203"
 dependencies = [
  "async-trait",
- "axum 0.8.7",
+ "axum 0.8.8",
  "base64 0.22.1",
  "bytes",
  "h2",
@@ -3656,9 +3675,9 @@ dependencies = [
 
 [[package]]
 name = "tower-http"
-version = "0.6.7"
+version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9cf146f99d442e8e68e585f5d798ccd3cad9a7835b917e09728880a862706456"
+checksum = "d4e6559d53cc268e5031cd8429d05415bc4cb4aefc4aa5d6cc35fbf5b924a1f8"
 dependencies = [
  "bitflags",
  "bytes",
@@ -3686,9 +3705,9 @@ checksum = "8df9b6e13f2d32c91b9bd719c00d1958837bc7dec474d94952798cc8e69eeec3"
 
 [[package]]
 name = "tracing"
-version = "0.1.43"
+version = "0.1.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d15d90a0b5c19378952d479dc858407149d7bb45a14de0142f6c534b16fc647"
+checksum = "63e71662fa4b2a2c3a26f570f037eb95bb1f85397f3cd8076caed2f026a6d100"
 dependencies = [
  "pin-project-lite",
  "tracing-attributes",
@@ -3708,9 +3727,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-core"
-version = "0.1.35"
+version = "0.1.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a04e24fab5c89c6a36eb8558c9656f30d81de51dfa4d3b45f26b21d61fa0a6c"
+checksum = "db97caf9d906fbde555dd62fa95ddba9eecfd14cb388e4f491a66d74cd5fb79a"
 dependencies = [
  "once_cell",
  "valuable",
@@ -3787,9 +3806,9 @@ dependencies = [
 
 [[package]]
 name = "unicase"
-version = "2.8.1"
+version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75b844d17643ee918803943289730bec8aac480150456169e647ed0b576ba539"
+checksum = "dbc4bc3a9f746d862c45cb89d705aa10f187bb96c76001afab07a0d35ce60142"
 
 [[package]]
 name = "unicode-ident"
@@ -3817,9 +3836,9 @@ checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
 [[package]]
 name = "url"
-version = "2.5.7"
+version = "2.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08bc136a29a3d1758e07a9cca267be308aeebf5cfd5a10f3f67ab2097683ef5b"
+checksum = "ff67a8a4397373c3ef660812acab3268222035010ab8680ec4215f38ba3d0eed"
 dependencies = [
  "form_urlencoded",
  "idna",
@@ -4443,9 +4462,15 @@ dependencies = [
 
 [[package]]
 name = "zlib-rs"
-version = "0.5.3"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40990edd51aae2c2b6907af74ffb635029d5788228222c4bb811e9351c0caad3"
+
+[[package]]
+name = "zmij"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36134c44663532e6519d7a6dfdbbe06f6f8192bde8ae9ed076e9b213f0e31df7"
+checksum = "2fc5a66a20078bf1251bde995aa2fdcc4b800c70b5d92dd2c62abc5c60f679f8"
 
 [[package]]
 name = "zopfli"
diff --git a/temporalio/Gemfile b/temporalio/Gemfile
index 7b81f446..4b8c6673 100644
--- a/temporalio/Gemfile
+++ b/temporalio/Gemfile
@@ -11,6 +11,7 @@ group :development do
   gem 'base64'
   gem 'grpc', '~> 1.69'
   gem 'grpc-tools', '~> 1.69'
+  gem 'irb'
   gem 'minitest'
   # Have to explicitly depend on openssl for macos issue in GH CI described at
   # https://github.com/rails/rails/issues/55886 until 3.4.8 is released
@@ -21,10 +22,11 @@ group :development do
   gem 'opentelemetry-sdk'
   gem 'rake'
   gem 'rake-compiler'
-  gem 'rbs', '~> 3.5.3'
-  gem 'rb_sys', '~> 0.9.63'
+  gem 'rbs', '~> 3.10'
+  gem 'rb_sys', '~> 0.9'
+  gem 'rdoc'
   gem 'rubocop'
   gem 'sqlite3'
-  gem 'steep', '~> 1.7.1'
+  gem 'steep', '~> 1.10'
   gem 'yard'
 end
diff --git a/temporalio/Steepfile b/temporalio/Steepfile
index 3d19063c..9c1ab004 100644
--- a/temporalio/Steepfile
+++ b/temporalio/Steepfile
@@ -2,17 +2,32 @@
 
 D = Steep::Diagnostic
 
-target :lib do
-  signature 'sig', 'test/sig'
+common_diagnostics = {
+  # TODO(cretz): Needed because lack of proto RBS, waiting on https://github.com/protocolbuffers/protobuf/pull/15633
+  D::Ruby::UnknownConstant => :information,
 
-  check 'lib', 'test'
+  # Steep >= 1.9 started becoming too noisy in these cases
+  D::Ruby::UnannotatedEmptyCollection => :information,
+  D::Ruby::UndeclaredMethodDefinition => :information
+}
 
+target :lib do
+  signature 'sig'
+  check 'lib'
   ignore 'lib/temporalio/api', 'lib/temporalio/internal/bridge/api'
-
   library 'uri', 'objspace'
+  configure_code_diagnostics do |hash|
+    hash.update(common_diagnostics)
+  end
+end
 
+target :test do
+  signature 'sig', 'test/sig'
+  check 'test'
+  library 'uri', 'objspace'
   configure_code_diagnostics do |hash|
-    # TODO(cretz): Fix as more protos are generated
-    hash[D::Ruby::UnknownConstant] = :information
+    hash.update(common_diagnostics)
+    # Steep cannot infer some things, so we can ignore them in tests
+    hash[D::Ruby::InsufficientKeywordArguments] = :information
   end
 end
diff --git a/temporalio/ext/Cargo.toml b/temporalio/ext/Cargo.toml
index da818637..7331c809 100644
--- a/temporalio/ext/Cargo.toml
+++ b/temporalio/ext/Cargo.toml
@@ -13,7 +13,7 @@ crate-type = ["cdylib"]
 async-trait = "0.1"
 futures = "0.3"
 log = "0.4"
-magnus = "0.7"
+magnus = "0.8"
 parking_lot = "0.12"
 prost = { workspace = true }
 rb-sys = "0.9"
diff --git a/temporalio/ext/src/client.rs b/temporalio/ext/src/client.rs
index 7311eb8c..22d3792a 100644
--- a/temporalio/ext/src/client.rs
+++ b/temporalio/ext/src/client.rs
@@ -6,8 +6,8 @@ use temporalio_client::{
 };
 
 use magnus::{
-    DataTypeFunctions, Error, RHash, RString, Ruby, TypedData, Value, class, function, method,
-    prelude::*, scan_args,
+    DataTypeFunctions, Error, RHash, RString, Ruby, TypedData, Value, function, method, prelude::*,
+    scan_args,
 };
 use tonic::{Status, metadata::MetadataKey};
 use url::Url;
@@ -29,7 +29,7 @@ pub(crate) const SERVICE_HEALTH: u8 = 5;
 pub fn init(ruby: &Ruby) -> Result<(), Error> {
     let root_mod = ruby.get_inner(&ROOT_MOD);
 
-    let class = root_mod.define_class("Client", class::object())?;
+    let class = root_mod.define_class("Client", ruby.class_object())?;
     class.const_set("SERVICE_WORKFLOW", SERVICE_WORKFLOW)?;
     class.const_set("SERVICE_OPERATOR", SERVICE_OPERATOR)?;
     class.const_set("SERVICE_CLOUD", SERVICE_CLOUD)?;
@@ -45,7 +45,7 @@ pub fn init(ruby: &Ruby) -> Result<(), Error> {
     inner_class.define_method("message", method!(RpcFailure::message, 0))?;
     inner_class.define_method("details", method!(RpcFailure::details, 0))?;
 
-    let inner_class = class.define_class("CancellationToken", class::object())?;
+    let inner_class = class.define_class("CancellationToken", ruby.class_object())?;
     inner_class.define_singleton_method("new", function!(CancellationToken::new, 0))?;
     inner_class.define_method("cancel", method!(CancellationToken::cancel, 0))?;
     Ok(())
@@ -333,7 +333,11 @@ impl RpcFailure {
         if self.status.details().is_empty() {
             None
         } else {
-            Some(RString::from_slice(self.status.details()))
+            Some(
+                Ruby::get()
+                    .expect("Ruby missing")
+                    .str_from_slice(self.status.details()),
+            )
         }
     }
 }
@@ -407,7 +411,7 @@ where
             match result {
                 // TODO(cretz): Any reasonable way to prevent byte copy that is just going to get decoded into proto
                 // object?
-                Ok(val) => callback.push(&ruby, RString::from_slice(&val)),
+                Ok(val) => callback.push(&ruby, ruby.str_from_slice(&val)),
                 Err(status) => callback.push(&ruby, RpcFailure { status }),
             }
         },
diff --git a/temporalio/ext/src/envconfig.rs b/temporalio/ext/src/envconfig.rs
index adece43c..baea6676 100644
--- a/temporalio/ext/src/envconfig.rs
+++ b/temporalio/ext/src/envconfig.rs
@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use magnus::{Error, RHash, RString, Ruby, class, function, prelude::*, scan_args};
+use magnus::{Error, RHash, RString, Ruby, function, prelude::*, scan_args};
 use temporalio_common::envconfig::{
     ClientConfig as CoreClientConfig, ClientConfigCodec,
     ClientConfigProfile as CoreClientConfigProfile, ClientConfigTLS as CoreClientConfigTLS,
@@ -14,7 +14,7 @@ use crate::{ROOT_MOD, error};
 pub fn init(ruby: &Ruby) -> Result<(), Error> {
     let root_mod = ruby.get_inner(&ROOT_MOD);
 
-    let class = root_mod.define_class("EnvConfig", class::object())?;
+    let class = root_mod.define_class("EnvConfig", ruby.class_object())?;
     class.define_singleton_method("load_client_config", function!(load_client_config, -1))?;
     class.define_singleton_method(
         "load_client_connect_config",
@@ -25,7 +25,7 @@ pub fn init(ruby: &Ruby) -> Result<(), Error> {
 }
 
 fn data_source_to_hash(ruby: &Ruby, ds: &DataSource) -> Result<RHash, Error> {
-    let hash = RHash::new();
+    let hash = ruby.hash_new();
     match ds {
         DataSource::Path(p) => {
             hash.aset(ruby.sym_new("path"), ruby.str_new(p))?;
@@ -38,7 +38,7 @@ fn data_source_to_hash(ruby: &Ruby, ds: &DataSource) -> Result<RHash, Error> {
 }
 
 fn tls_to_hash(ruby: &Ruby, tls: &CoreClientConfigTLS) -> Result<RHash, Error> {
-    let hash = RHash::new();
+    let hash = ruby.hash_new();
     hash.aset(ruby.sym_new("disabled"), tls.disabled)?;
 
     if let Some(v) = &tls.client_cert {
@@ -65,7 +65,7 @@ fn tls_to_hash(ruby: &Ruby, tls: &CoreClientConfigTLS) -> Result<RHash, Error> {
 }
 
 fn codec_to_hash(ruby: &Ruby, codec: &ClientConfigCodec) -> Result<RHash, Error> {
-    let hash = RHash::new();
+    let hash = ruby.hash_new();
     if let Some(v) = &codec.endpoint {
         hash.aset(ruby.sym_new("endpoint"), ruby.str_new(v))?;
     }
@@ -76,7 +76,7 @@ fn codec_to_hash(ruby: &Ruby, codec: &ClientConfigCodec) -> Result<RHash, Error>
 }
 
 fn profile_to_hash(ruby: &Ruby, profile: &CoreClientConfigProfile) -> Result<RHash, Error> {
-    let hash = RHash::new();
+    let hash = ruby.hash_new();
 
     if let Some(v) = &profile.address {
         hash.aset(ruby.sym_new("address"), ruby.str_new(v))?;
@@ -94,7 +94,7 @@ fn profile_to_hash(ruby: &Ruby, profile: &CoreClientConfigProfile) -> Result<RHa
         hash.aset(ruby.sym_new("codec"), codec_to_hash(ruby, codec)?)?;
     }
     if !profile.grpc_meta.is_empty() {
-        let grpc_meta_hash = RHash::new();
+        let grpc_meta_hash = ruby.hash_new();
         for (k, v) in &profile.grpc_meta {
             grpc_meta_hash.aset(ruby.str_new(k), ruby.str_new(v))?;
         }
@@ -105,7 +105,7 @@ fn profile_to_hash(ruby: &Ruby, profile: &CoreClientConfigProfile) -> Result<RHa
 }
 
 fn core_config_to_hash(ruby: &Ruby, core_config: &CoreClientConfig) -> Result<RHash, Error> {
-    let profiles_hash = RHash::new();
+    let profiles_hash = ruby.hash_new();
     for (name, profile) in &core_config.profiles {
         let profile_hash = profile_to_hash(ruby, profile)?;
         profiles_hash.aset(ruby.str_new(name), profile_hash)?;
diff --git a/temporalio/ext/src/metric.rs b/temporalio/ext/src/metric.rs
index 9e07ad90..921becfa 100644
--- a/temporalio/ext/src/metric.rs
+++ b/temporalio/ext/src/metric.rs
@@ -2,7 +2,7 @@ use std::{any::Any, sync::Arc, time::Duration};
 
 use magnus::{
     DataTypeFunctions, Error, Float, Integer, RClass, RHash, RModule, RString, Ruby, StaticSymbol,
-    Symbol, TryConvert, TypedData, Value, class, function,
+    Symbol, TryConvert, TypedData, Value, function,
     gc::register_mark_object,
     method,
     prelude::*,
@@ -18,18 +18,18 @@ use crate::{ROOT_MOD, error, id, runtime::Runtime, util::SendSyncBoxValue};
 pub fn init(ruby: &Ruby) -> Result<(), Error> {
     let root_mod = ruby.get_inner(&ROOT_MOD);
 
-    let class = root_mod.define_class("Metric", class::object())?;
+    let class = root_mod.define_class("Metric", ruby.class_object())?;
     class.define_singleton_method("new", function!(Metric::new, 6))?;
     class.define_method("record_value", method!(Metric::record_value, 2))?;
 
-    let inner_class = class.define_class("Meter", class::object())?;
+    let inner_class = class.define_class("Meter", ruby.class_object())?;
     inner_class.define_singleton_method("new", function!(MetricMeter::new, 1))?;
     inner_class.define_method(
         "default_attributes",
         method!(MetricMeter::default_attributes, 0),
     )?;
 
-    let inner_class = class.define_class("Attributes", class::object())?;
+    let inner_class = class.define_class("Attributes", ruby.class_object())?;
     inner_class.define_method(
         "with_additional",
         method!(MetricAttributes::with_additional, 1),
diff --git a/temporalio/ext/src/runtime.rs b/temporalio/ext/src/runtime.rs
index 1cb7ffc0..824b6cbe 100644
--- a/temporalio/ext/src/runtime.rs
+++ b/temporalio/ext/src/runtime.rs
@@ -2,7 +2,7 @@ use super::{ROOT_MOD, error, id};
 use crate::metric::{BufferedMetricRef, convert_metric_events};
 use crate::util::{Struct, without_gvl};
 use magnus::{
-    DataTypeFunctions, Error, RArray, Ruby, TypedData, Value, class, function, method, prelude::*,
+    DataTypeFunctions, Error, RArray, Ruby, TypedData, Value, function, method, prelude::*,
 };
 use std::collections::HashMap;
 use std::net::SocketAddr;
@@ -25,7 +25,7 @@ use url::Url;
 pub fn init(ruby: &Ruby) -> Result<(), Error> {
     let class = ruby
         .get_inner(&ROOT_MOD)
-        .define_class("Runtime", class::object())?;
+        .define_class("Runtime", ruby.class_object())?;
     class.define_singleton_method("new", function!(Runtime::new, 1))?;
     class.define_method("run_command_loop", method!(Runtime::run_command_loop, 0))?;
     class.define_method(
diff --git a/temporalio/ext/src/testing.rs b/temporalio/ext/src/testing.rs
index dc2a4e4a..ac16c3b7 100644
--- a/temporalio/ext/src/testing.rs
+++ b/temporalio/ext/src/testing.rs
@@ -1,8 +1,6 @@
 use std::time::Duration;
 
-use magnus::{
-    DataTypeFunctions, Error, Ruby, TypedData, Value, class, function, method, prelude::*,
-};
+use magnus::{DataTypeFunctions, Error, Ruby, TypedData, Value, function, method, prelude::*};
 use parking_lot::Mutex;
 use temporalio_sdk_core::ephemeral_server::{
     self, EphemeralExe, EphemeralExeVersion, TemporalDevServerConfigBuilder,
@@ -20,7 +18,7 @@ pub fn init(ruby: &Ruby) -> Result<(), Error> {
 
     let module = root_mod.define_module("Testing")?;
 
-    let class = module.define_class("EphemeralServer", class::object())?;
+    let class = module.define_class("EphemeralServer", ruby.class_object())?;
     class.define_singleton_method(
         "async_start_dev_server",
         function!(EphemeralServer::async_start_dev_server, 3),
diff --git a/temporalio/ext/src/util.rs b/temporalio/ext/src/util.rs
index acd57940..c7b1f237 100644
--- a/temporalio/ext/src/util.rs
+++ b/temporalio/ext/src/util.rs
@@ -26,18 +26,23 @@ impl Struct {
     where
         T: TryConvert,
     {
+        let ruby = Ruby::get().expect("Ruby missing");
         self.inner.getmember::<_, T>(field).map_err(|err| {
             if self.field_path.is_empty() {
-                error!("Failed reading field '{}': {}", field.into_symbol(), err)
+                error!(
+                    "Failed reading field '{}': {}",
+                    field.into_symbol_with(&ruby),
+                    err
+                )
             } else {
                 error!(
                     "Failed reading field '{}.{}': {}",
                     self.field_path
                         .iter()
-                        .map(|v| v.into_symbol().to_string())
+                        .map(|v| v.into_symbol_with(&ruby).to_string())
                         .collect::<Vec<String>>()
                         .join("."),
-                    field.into_symbol(),
+                    field.into_symbol_with(&ruby),
                     err
                 )
             }
diff --git a/temporalio/ext/src/worker.rs b/temporalio/ext/src/worker.rs
index 8eff7dc3..e0eea081 100644
--- a/temporalio/ext/src/worker.rs
+++ b/temporalio/ext/src/worker.rs
@@ -19,7 +19,7 @@ use magnus::{
     DataTypeFunctions, Error, Exception, IntoValue, RArray, RClass, RModule, RString, RTypedData,
     Ruby, TypedData, Value,
     block::Proc,
-    class, function, method,
+    function, method,
     prelude::*,
     typed_data,
     value::{Lazy, LazyId},
@@ -53,7 +53,7 @@ use tokio_stream::wrappers::ReceiverStream;
 pub fn init(ruby: &Ruby) -> Result<(), Error> {
     let class = ruby
         .get_inner(&ROOT_MOD)
-        .define_class("Worker", class::object())?;
+        .define_class("Worker", ruby.class_object())?;
     class.define_singleton_method("new", function!(Worker::new, 2))?;
     class.define_singleton_method("async_poll_all", function!(Worker::async_poll_all, 2))?;
     class.define_singleton_method(
@@ -76,7 +76,7 @@ pub fn init(ruby: &Ruby) -> Result<(), Error> {
     class.define_method("replace_client", method!(Worker::replace_client, 1))?;
     class.define_method("initiate_shutdown", method!(Worker::initiate_shutdown, 0))?;
 
-    let inner_class = class.define_class("WorkflowReplayer", class::object())?;
+    let inner_class = class.define_class("WorkflowReplayer", ruby.class_object())?;
     inner_class.define_singleton_method("new", function!(WorkflowReplayer::new, 2))?;
     inner_class.define_method("push_history", method!(WorkflowReplayer::push_history, 2))?;
 
@@ -241,15 +241,15 @@ impl Worker {
                         };
                         // Call block
                         let result: Value = match poll_result.result {
-                            Ok(Some(val)) => RString::from_slice(&val).as_value(),
+                            Ok(Some(val)) => ruby.str_from_slice(&val).as_value(),
                             Ok(None) => ruby.qnil().as_value(),
                             Err(err) => new_error!("Poll failure: {}", err).as_value(),
                         };
                         callback.push(
                             &ruby,
                             ruby.ary_new_from_values(&[
-                                poll_result.worker_index.into_value(),
-                                worker_type.into_value(),
+                                poll_result.worker_index.into_value_with(&ruby),
+                                worker_type.into_value_with(&ruby),
                                 result,
                             ]),
                         )
diff --git a/temporalio/lib/temporalio/activity/definition.rb b/temporalio/lib/temporalio/activity/definition.rb
index 10637a81..413545d2 100644
--- a/temporalio/lib/temporalio/activity/definition.rb
+++ b/temporalio/lib/temporalio/activity/definition.rb
@@ -123,6 +123,11 @@ def execute(*args)
         raise NotImplementedError, 'Activity did not implement "execute"'
       end
 
+      # @!visibility private
+      def _activity_definition_details
+        self.class._activity_definition_details
+      end
+
       # Definition info of an activity. Activities are usually classes/instances that extend {Definition}, but
       # definitions can also be manually created with a block via {initialize} here.
       class Info
@@ -175,7 +180,7 @@ def self.from_activity(activity)
               result_hint: details[:activity_result_hint]
             ) { |*args| Context.current.instance&.execute(*args) }
           when Definition
-            details = activity.class._activity_definition_details
+            details = activity._activity_definition_details
             new(
               name: details[:activity_name],
               instance: activity,
diff --git a/temporalio/lib/temporalio/converters/payload_converter/binary_protobuf.rb b/temporalio/lib/temporalio/converters/payload_converter/binary_protobuf.rb
index e13f894b..b7cc2786 100644
--- a/temporalio/lib/temporalio/converters/payload_converter/binary_protobuf.rb
+++ b/temporalio/lib/temporalio/converters/payload_converter/binary_protobuf.rb
@@ -22,7 +22,10 @@ def to_payload(value, hint: nil) # rubocop:disable Lint/UnusedMethodArgument
 
           # @type var value: Google::Protobuf::MessageExts
           Api::Common::V1::Payload.new(
-            metadata: { 'encoding' => ENCODING, 'messageType' => value.class.descriptor.name },
+            metadata: {
+              'encoding' => ENCODING,
+              'messageType' => value.class.descriptor.name # steep:ignore NoMethod
+            },
             data: value.to_proto
           )
         end
diff --git a/temporalio/lib/temporalio/converters/payload_converter/json_protobuf.rb b/temporalio/lib/temporalio/converters/payload_converter/json_protobuf.rb
index db12dce7..d09228fc 100644
--- a/temporalio/lib/temporalio/converters/payload_converter/json_protobuf.rb
+++ b/temporalio/lib/temporalio/converters/payload_converter/json_protobuf.rb
@@ -21,7 +21,10 @@ def to_payload(value, hint: nil) # rubocop:disable Lint/UnusedMethodArgument
           return nil unless value.is_a?(Google::Protobuf::MessageExts)
 
           Api::Common::V1::Payload.new(
-            metadata: { 'encoding' => ENCODING, 'messageType' => value.class.descriptor.name },
+            metadata: {
+              'encoding' => ENCODING,
+              'messageType' => value.class.descriptor.name # steep:ignore NoMethod
+            },
             data: value.to_json.b
           )
         end
diff --git a/temporalio/lib/temporalio/internal/worker/workflow_instance/externally_immutable_hash.rb b/temporalio/lib/temporalio/internal/worker/workflow_instance/externally_immutable_hash.rb
index a1eeb56a..65f18773 100644
--- a/temporalio/lib/temporalio/internal/worker/workflow_instance/externally_immutable_hash.rb
+++ b/temporalio/lib/temporalio/internal/worker/workflow_instance/externally_immutable_hash.rb
@@ -9,7 +9,7 @@ class WorkflowInstance
         # Delegator to a hash that does not allow external mutations. Used for memo.
         class ExternallyImmutableHash < SimpleDelegator
           def initialize(initial_hash)
-            super(initial_hash.freeze)
+            super(initial_hash.freeze) # steep:ignore ArgumentTypeMismatch
           end
 
           def _update(&)
diff --git a/temporalio/lib/temporalio/internal/worker/workflow_instance/handler_hash.rb b/temporalio/lib/temporalio/internal/worker/workflow_instance/handler_hash.rb
index 890b8dc0..ebc58073 100644
--- a/temporalio/lib/temporalio/internal/worker/workflow_instance/handler_hash.rb
+++ b/temporalio/lib/temporalio/internal/worker/workflow_instance/handler_hash.rb
@@ -7,7 +7,7 @@ class WorkflowInstance
         # Hash for handlers that notifies when one is added. Only `[]=` and `store` can be used to mutate it.
         class HandlerHash < SimpleDelegator
           def initialize(initial_frozen_hash, definition_class, &on_new_definition)
-            super(initial_frozen_hash)
+            super(initial_frozen_hash) # steep:ignore ArgumentTypeMismatch
             @definition_class = definition_class
             @on_new_definition = on_new_definition
           end
diff --git a/temporalio/lib/temporalio/internal/worker/workflow_instance/illegal_call_tracer.rb b/temporalio/lib/temporalio/internal/worker/workflow_instance/illegal_call_tracer.rb
index 54455c1f..2852bd89 100644
--- a/temporalio/lib/temporalio/internal/worker/workflow_instance/illegal_call_tracer.rb
+++ b/temporalio/lib/temporalio/internal/worker/workflow_instance/illegal_call_tracer.rb
@@ -13,7 +13,7 @@ def self.frozen_validated_illegal_calls(illegal_calls)
             illegal_calls.to_h do |key, val|
               raise TypeError, 'Invalid illegal call map, top-level key must be a String' unless key.is_a?(String)
 
-              # @type var fixed_val: :all | Worker::IllegalWorkflowCallValidator | Hash[Symbol, TrueClass | Worker::IllegalWorkflowCallValidator] # rubocop:disable Layout/LineLength
+              # @type var fixed_val: :all | Temporalio::Worker::IllegalWorkflowCallValidator | Hash[Symbol, (true | Temporalio::Worker::IllegalWorkflowCallValidator)]
               fixed_val = case val
                           when Temporalio::Worker::IllegalWorkflowCallValidator
                             if val.method_name
@@ -86,21 +86,25 @@ def initialize(illegal_calls)
                 when Temporalio::Worker::IllegalWorkflowCallValidator
                   disable_temporarily do
                     vals.block.call(Temporalio::Worker::IllegalWorkflowCallValidator::CallInfo.new(
-                                      class_name:, method_name: tp.callee_id, trace_point: tp
+                                      class_name:,
+                                      method_name: tp.callee_id || :__unknown__,
+                                      trace_point: tp
                                     ))
                     nil
                   rescue Exception => e # rubocop:disable Lint/RescueException
                     ", reason: #{e}"
                   end
                 else
-                  per_method = vals&.[](tp.callee_id)
+                  per_method = vals&.[](tp.callee_id || :__unknown__)
                   case per_method
                   when true
                     ''
                   when Temporalio::Worker::IllegalWorkflowCallValidator
                     disable_temporarily do
                       per_method.block.call(Temporalio::Worker::IllegalWorkflowCallValidator::CallInfo.new(
-                                              class_name:, method_name: tp.callee_id, trace_point: tp
+                                              class_name:,
+                                              method_name: tp.callee_id || :__unknown__,
+                                              trace_point: tp
                                             ))
                       nil
                     rescue Exception => e # rubocop:disable Lint/RescueException
diff --git a/temporalio/lib/temporalio/internal/worker/workflow_instance/scheduler.rb b/temporalio/lib/temporalio/internal/worker/workflow_instance/scheduler.rb
index 6663e7a4..21410a72 100644
--- a/temporalio/lib/temporalio/internal/worker/workflow_instance/scheduler.rb
+++ b/temporalio/lib/temporalio/internal/worker/workflow_instance/scheduler.rb
@@ -141,6 +141,10 @@ def fiber(&block)
             fiber
           end
 
+          def fiber_interrupt(fiber, exception)
+            fiber.raise(exception) if fiber.alive?
+          end
+
           def io_wait(io, events, timeout)
             # Do not allow if IO disabled
             unless @instance.io_enabled
diff --git a/temporalio/lib/temporalio/simple_plugin.rb b/temporalio/lib/temporalio/simple_plugin.rb
index 4164c250..28854c45 100644
--- a/temporalio/lib/temporalio/simple_plugin.rb
+++ b/temporalio/lib/temporalio/simple_plugin.rb
@@ -121,7 +121,7 @@ def configure_worker(options)
     # Implements {Worker::Plugin#run_worker}.
     def run_worker(options, next_call)
       if @options.run_context
-        @options.run_context.call(options, next_call) # steep:ignore
+        @options.run_context.call(options, next_call) # steep:ignore NoMethod
       else
         next_call.call(options)
       end
@@ -151,7 +151,7 @@ def configure_workflow_replayer(options)
     # Implements {Worker::Plugin#with_workflow_replay_worker}.
     def with_workflow_replay_worker(options, next_call)
       if @options.run_context
-        @options.run_context.call(options, next_call) # steep:ignore
+        @options.run_context.call(options, next_call) # steep:ignore NoMethod
       else
         next_call.call(options)
       end
@@ -163,7 +163,7 @@ def _single_option(new:, existing:, type:, name:)
       when nil
         nil
       when Proc
-        new.call(existing).tap do |val|
+        new.call(existing).tap do |val| # steep:ignore NoMethod
           raise "Instance of #{name} required" unless val.is_a?(type)
         end
       when type
@@ -179,11 +179,11 @@ def _array_option(new:, existing:, name:)
       when nil
         nil
       when Proc
-        new.call(existing).tap do |conv|
+        new.call(existing).tap do |conv| # steep:ignore NoMethod
           raise "Array for #{name} required" unless conv.is_a?(Array)
         end
       when Array
-        existing + new # steep:ignore
+        existing + new # steep:ignore NoMethod
       else
         raise "Unrecognized #{name} type #{new.class}"
       end
diff --git a/temporalio/lib/temporalio/workflow/definition.rb b/temporalio/lib/temporalio/workflow/definition.rb
index 3f362e8b..d4caa6e6 100644
--- a/temporalio/lib/temporalio/workflow/definition.rb
+++ b/temporalio/lib/temporalio/workflow/definition.rb
@@ -102,7 +102,9 @@ def workflow_query_attr_reader(*attr_names, description: nil)
 
             # Just run this as if done manually
             workflow_query(description:)
-            define_method(attr_name) { instance_variable_get("@#{attr_name}") }
+            define_method(attr_name) do
+              instance_variable_get("@#{attr_name}") # steep:ignore NoMethod
+            end
           end
         end
 
diff --git a/temporalio/rbs_collection.lock.yaml b/temporalio/rbs_collection.lock.yaml
index b5853bb2..c266f61d 100644
--- a/temporalio/rbs_collection.lock.yaml
+++ b/temporalio/rbs_collection.lock.yaml
@@ -2,19 +2,19 @@
 path: ".gem_rbs_collection"
 gems:
 - name: activemodel
-  version: '7.0'
+  version: '7.1'
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 2275d263564ec90f749ea9ff8fce8160b9ed58e9
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: activerecord
-  version: '7.1'
+  version: '8.0'
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 2275d263564ec90f749ea9ff8fce8160b9ed58e9
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: activesupport
@@ -22,7 +22,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: async
@@ -30,30 +30,50 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: base64
-  version: '0'
+  version: 0.3.0
   source:
-    type: stdlib
+    type: rubygems
 - name: bigdecimal
-  version: '0'
+  version: '4.0'
   source:
-    type: stdlib
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
 - name: concurrent-ruby
   version: '1.1'
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: csv
+  version: '3.3'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: date
   version: '0'
   source:
     type: stdlib
-- name: date
+- name: dbm
+  version: '0'
+  source:
+    type: stdlib
+- name: delegate
+  version: '0'
+  source:
+    type: stdlib
+- name: digest
   version: '0'
   source:
     type: stdlib
@@ -74,7 +94,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: grpc
@@ -82,7 +102,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: i18n
@@ -90,9 +110,13 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
+- name: io-console
+  version: '0'
+  source:
+    type: stdlib
 - name: json
   version: '0'
   source:
@@ -102,17 +126,21 @@ gems:
   source:
     type: stdlib
 - name: minitest
-  version: '0'
+  version: '5.25'
   source:
-    type: stdlib
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
 - name: monitor
   version: '0'
   source:
     type: stdlib
 - name: mutex_m
-  version: '0'
+  version: 0.3.0
   source:
-    type: stdlib
+    type: rubygems
 - name: openssl
   version: '0'
   source:
@@ -121,12 +149,28 @@ gems:
   version: '0'
   source:
     type: stdlib
-- name: pathname
+- name: pp
+  version: '0'
+  source:
+    type: stdlib
+- name: prettyprint
+  version: '0'
+  source:
+    type: stdlib
+- name: prism
+  version: 1.7.0
+  source:
+    type: rubygems
+- name: pstore
+  version: '0'
+  source:
+    type: stdlib
+- name: psych
   version: '0'
   source:
     type: stdlib
 - name: rbs
-  version: 3.5.3
+  version: 3.10.0
   source:
     type: rubygems
 - name: rdoc
@@ -154,9 +198,13 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 7ae9e3cf731a9628e0cc39064ed6e2cf51d822da
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
+- name: stringio
+  version: '0'
+  source:
+    type: stdlib
 - name: strscan
   version: '0'
   source:
@@ -178,7 +226,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: uri
@@ -190,7 +238,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: e9bc1bf94c262e79a2d599a9c173342915b29808
+    revision: 2af46cde7fec5e4130f6c84c5b691c0538af8789
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 gemfile_lock_path: Gemfile.lock
diff --git a/temporalio/sig/temporalio/activity/definition.rbs b/temporalio/sig/temporalio/activity/definition.rbs
index 70e3c978..9e4f8b9a 100644
--- a/temporalio/sig/temporalio/activity/definition.rbs
+++ b/temporalio/sig/temporalio/activity/definition.rbs
@@ -20,6 +20,15 @@ module Temporalio
   
       def execute: (*untyped) -> untyped
 
+      def _activity_definition_details: -> {
+        activity_name: String | Symbol | nil,
+        activity_executor: Symbol,
+        activity_cancel_raise: bool,
+        activity_raw_args: bool,
+        activity_arg_hints: Array[Object]?,
+        activity_result_hint: Object?
+      }
+
       class Info
         attr_reader name: String | Symbol | nil
         attr_reader instance: Object | Proc | nil
diff --git a/temporalio/sig/temporalio/converters/payload_converter.rbs b/temporalio/sig/temporalio/converters/payload_converter.rbs
index 113de88d..5ac4c055 100644
--- a/temporalio/sig/temporalio/converters/payload_converter.rbs
+++ b/temporalio/sig/temporalio/converters/payload_converter.rbs
@@ -1,12 +1,12 @@
 module Temporalio
   module Converters
     class PayloadConverter
-      def self.default: -> PayloadConverter
+      def self.default: -> Composite
 
       def self.new_with_defaults: (
         ?json_parse_options: Hash[Symbol, untyped],
         ?json_generate_options: Hash[Symbol, untyped]
-      ) -> PayloadConverter
+      ) -> Composite
 
       def to_payload: (Object? value, ?hint: Object?) -> untyped
       def to_payloads: (Array[Object?] values, ?hints: Array[Object]?) -> untyped
diff --git a/temporalio/sig/temporalio/internal/worker/workflow_instance/context.rbs b/temporalio/sig/temporalio/internal/worker/workflow_instance/context.rbs
index 6eb15bfe..e2072ae7 100644
--- a/temporalio/sig/temporalio/internal/worker/workflow_instance/context.rbs
+++ b/temporalio/sig/temporalio/internal/worker/workflow_instance/context.rbs
@@ -81,7 +81,7 @@ module Temporalio
 
           def now: -> Time
 
-          def patched: (String patch_id) -> bool
+          def patched: (Symbol | String patch_id) -> bool
 
           def payload_converter: -> Converters::PayloadConverter
 
diff --git a/temporalio/sig/temporalio/workflow.rbs b/temporalio/sig/temporalio/workflow.rbs
index 74915080..96107332 100644
--- a/temporalio/sig/temporalio/workflow.rbs
+++ b/temporalio/sig/temporalio/workflow.rbs
@@ -17,6 +17,8 @@ module Temporalio
 
     def self.current_update_info: -> UpdateInfo?
 
+    def self.deprecate_patch: (Symbol | String patch_id) -> void
+
     def self.execute_activity: (
       singleton(Activity::Definition) | Symbol | String activity,
       *Object? args,
@@ -91,7 +93,7 @@ module Temporalio
 
     def self.now: -> Time
 
-    def self.patched: (String patch_id) -> bool
+    def self.patched: (Symbol | String patch_id) -> bool
 
     def self.payload_converter: -> Converters::PayloadConverter
 
diff --git a/temporalio/temporalio.gemspec b/temporalio/temporalio.gemspec
index b989a75e..cc89a725 100644
--- a/temporalio/temporalio.gemspec
+++ b/temporalio/temporalio.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
   spec.extensions = ['ext/Cargo.toml']
   spec.metadata['rubygems_mfa_required'] = 'true'
-  spec.required_ruby_version = '>= 3.2.0'
+  spec.required_ruby_version = '>= 3.3.0'
 
   spec.add_dependency 'google-protobuf', '>= 3.25.0'
   spec.add_dependency 'logger'
diff --git a/temporalio/test/converters/payload_converter_test.rb b/temporalio/test/converters/payload_converter_test.rb
index ac0431a2..09981cf2 100644
--- a/temporalio/test/converters/payload_converter_test.rb
+++ b/temporalio/test/converters/payload_converter_test.rb
@@ -8,13 +8,6 @@
 
 module Converters
   class PayloadConverterTest < Test
-    # @type method assert_payload: (
-    #   untyped input,
-    #   String expected_encoding,
-    #   String expected_data,
-    #   ?expected_decoded_input: untyped,
-    #   ?converter: Temporalio::Converters::PayloadConverter
-    # ) -> untyped
     def assert_payload(
       input,
       expected_encoding,
@@ -99,6 +92,8 @@ def test_binary_proto
       assert_equal 'temporal.api.common.v1.WorkflowExecution', payload.metadata['messageType']
     end
 
+    # steep:ignore:start
+
     # Need this support library for active model to work
     module ActiveRecordJSONSupport
       extend ActiveSupport::Concern
@@ -186,5 +181,7 @@ def test_active_record_and_model
       assert_instance_of MyActiveModelObject, new_obj
       assert_equal obj.attributes, new_obj.attributes
     end
+
+    # steep:ignore:end
   end
 end
diff --git a/temporalio/test/gc_utils.rb b/temporalio/test/gc_utils.rb
index a8f2aa4f..cd3c0c94 100644
--- a/temporalio/test/gc_utils.rb
+++ b/temporalio/test/gc_utils.rb
@@ -80,7 +80,7 @@ def find_retaining_path_to(target_id, max_depth: 12, max_visits: 250_000, catego
         i = parent[i]
       end
       objs = ids.reverse.map do |id|
-        ObjectSpace._id2ref(id)
+        ObjectSpace._id2ref(id) # steep:ignore
       rescue StandardError
         id
       end
diff --git a/temporalio/test/sig/converters/payload_converter_test.rbs b/temporalio/test/sig/converters/payload_converter_test.rbs
new file mode 100644
index 00000000..f22f4590
--- /dev/null
+++ b/temporalio/test/sig/converters/payload_converter_test.rbs
@@ -0,0 +1,11 @@
+module Converters
+  class PayloadConverterTest < Test
+    def assert_payload: (
+      untyped input,
+      String expected_encoding,
+      String expected_data,
+      ?expected_decoded_input: untyped,
+      ?converter: Temporalio::Converters::PayloadConverter
+    ) -> untyped
+  end
+end
\ No newline at end of file
diff --git a/temporalio/test/sig/gc_utils.rbs b/temporalio/test/sig/gc_utils.rbs
index 0c335596..f5811350 100644
--- a/temporalio/test/sig/gc_utils.rbs
+++ b/temporalio/test/sig/gc_utils.rbs
@@ -6,7 +6,7 @@ module GCUtils
     ?category_whitelist: Array[String]?
   ) -> [Array[untyped], String]
 
-  def self.print_annotated_path: (Array[untyped] path, root_category: String) -> void
+  def self.annotated_path: (Array[untyped] path, root_category: String) -> String
 
   def self.edge_labels: (untyped parent, untyped child) -> Array[String]
 
diff --git a/temporalio/test/sig/worker_workflow_test.rbs b/temporalio/test/sig/worker_workflow_test.rbs
new file mode 100644
index 00000000..18f9bd4f
--- /dev/null
+++ b/temporalio/test/sig/worker_workflow_test.rbs
@@ -0,0 +1,26 @@
+class WorkerWorkflowTest < Test
+  class NonDeterminismErrorWorkflow < Temporalio::Workflow::Definition
+    def execute: () -> void
+    def self.finish: () -> Temporalio::Workflow::Definition::Signal
+  end
+
+  class PatchWorkflowBase < Temporalio::Workflow::Definition
+    attr_writer activity_result: untyped
+  end
+
+  class ConfirmGarbageCollectWorkflow < Temporalio::Workflow::Definition
+    attr_accessor self.initialized_count: Integer
+    attr_accessor self.finalized_count: Integer
+    attr_accessor self.weak_instance: ConfirmGarbageCollectWorkflow?
+    attr_accessor self.strong_instance: ConfirmGarbageCollectWorkflow?
+    attr_accessor self.instance_object_id: Integer?
+    attr_accessor self.weak_fiber: Fiber?
+    attr_accessor self.fiber_object_id: Integer?
+    def execute: () -> void
+  end
+
+  class UnsafeIOWorkflow < Temporalio::Workflow::Definition
+    def execute: (bool unsafe_io_enabled) -> void
+    def do_http_call: () -> void
+  end
+end
\ No newline at end of file
diff --git a/temporalio/test/sig/workflow_utils.rbs b/temporalio/test/sig/workflow_utils.rbs
index 817d09e3..830b737d 100644
--- a/temporalio/test/sig/workflow_utils.rbs
+++ b/temporalio/test/sig/workflow_utils.rbs
@@ -17,6 +17,7 @@ module WorkflowUtils
     ?id_conflict_policy: Temporalio::WorkflowIDConflictPolicy::enum,
     ?max_heartbeat_throttle_interval: Float,
     ?task_timeout: duration?,
+    ?interceptors: Array[Temporalio::Worker::Interceptor::Activity | Temporalio::Worker::Interceptor::Workflow],
     ?on_worker_run: Proc?,
     ?unsafe_workflow_io_enabled: bool,
     ?priority: Temporalio::Priority,
@@ -41,6 +42,7 @@ module WorkflowUtils
     ?id_conflict_policy: Temporalio::WorkflowIDConflictPolicy::enum,
     ?max_heartbeat_throttle_interval: Float,
     ?task_timeout: duration?,
+    ?interceptors: Array[Temporalio::Worker::Interceptor::Activity | Temporalio::Worker::Interceptor::Workflow],
     ?on_worker_run: Proc?,
     ?unsafe_workflow_io_enabled: bool,
     ?priority: Temporalio::Priority,
diff --git a/temporalio/test/test.rb b/temporalio/test/test.rb
index b1c18da3..db467637 100644
--- a/temporalio/test/test.rb
+++ b/temporalio/test/test.rb
@@ -65,7 +65,7 @@ def self.method_added(method_name)
 
     original_method = instance_method(method_name)
     define_method("#{method_name}_in_fiber") do
-      Async do |_task|
+      Kernel.Async do |_task|
         original_method.bind(self).call
       end
     end
@@ -155,8 +155,7 @@ def initialize
             '--dynamic-config-value', 'system.enableDeploymentVersions=true',
             # Enable activity pause
             '--dynamic-config-value', 'frontend.activityAPIsEnabled=true'
-          ],
-          dev_server_download_version: 'v1.4.1-cloud-v1-29-0-139-2.0'
+          ]
         )
         Minitest.after_run do
           @server.shutdown
diff --git a/temporalio/test/worker_workflow_handler_test.rb b/temporalio/test/worker_workflow_handler_test.rb
index f89fcfb7..4e3fd48a 100644
--- a/temporalio/test/worker_workflow_handler_test.rb
+++ b/temporalio/test/worker_workflow_handler_test.rb
@@ -454,14 +454,14 @@ def test_unfinished_handlers_warn
       { 'name' => 'some_update1', 'id' => 'my-update-1' },
       { 'name' => 'some_update1', 'id' => 'my-update-2' },
       { 'name' => 'some_update2', 'id' => 'my-update-3' }
-    ], JSON.parse(trailing_arr)
+    ], JSON.parse(trailing_arr) # steep:ignore
 
     # Check update
     signal_lines = lines.select { |l| l.include?('signal handlers are still running') }
     assert_equal 1, signal_lines.size
     trailing_arr = signal_lines.first[signal_lines.first.rindex('[')..] # steep:ignore
     assert_equal [{ 'name' => 'some_signal1', 'count' => 2 }, { 'name' => 'some_signal2', 'count' => 1 }],
-                 JSON.parse(trailing_arr)
+                 JSON.parse(trailing_arr) # steep:ignore
   end
 
   def test_unfinished_handlers_all_finished
diff --git a/temporalio/test/worker_workflow_test.rb b/temporalio/test/worker_workflow_test.rb
index 679a0342..4fe96fb1 100644
--- a/temporalio/test/worker_workflow_test.rb
+++ b/temporalio/test/worker_workflow_test.rb
@@ -68,7 +68,7 @@ def execute(scenario)
       when :queue
         Queue.new
       when :sized_queue
-        SizedQueue.new
+        SizedQueue.new(100)
       when :mutex
         Mutex.new
       when :condvar
@@ -182,9 +182,9 @@ def test_arg_count
   class InfoWorkflow < Temporalio::Workflow::Definition
     def execute
       Temporalio::Workflow.info.to_h.tap do |h|
-        h['parent'] = Temporalio::Workflow.info.parent.to_h if Temporalio::Workflow.info.parent
-        h['root'] = Temporalio::Workflow.info.root.to_h if Temporalio::Workflow.info.root
-        h['start_time'] = Temporalio::Workflow.info.start_time.to_s
+        h[:parent] = Temporalio::Workflow.info.parent.to_h if Temporalio::Workflow.info.parent
+        h[:root] = Temporalio::Workflow.info.root.to_h if Temporalio::Workflow.info.root
+        h[:start_time] = Temporalio::Workflow.info.start_time.to_s
       end
     end
   end
@@ -755,8 +755,6 @@ def finish
   end
 
   class NonDeterminismErrorSpecificAsFailureWorkflow < NonDeterminismErrorWorkflow
-    # @type module: Temporalio::Workflow::Definition.class
-
     workflow_failure_exception_type Temporalio::Workflow::NondeterminismError
   end
 
@@ -899,6 +897,7 @@ def execute(scenario)
           Temporalio::Workflow::Future.new { Temporalio::Workflow.sleep(0.01) },
           Temporalio::Workflow::Future.new { 'done' }
         ).wait
+        # @type var result: String?
         raise unless result == 'done'
 
         # Any of with exception
@@ -1078,7 +1077,7 @@ def test_payload_codec
     new_options = env.client.options.with(
       data_converter: Temporalio::Converters::DataConverter.new(payload_codec: Base64Codec.new)
     )
-    client = Temporalio::Client.new(**new_options.to_h)
+    client = Temporalio::Client.new(**new_options.to_h) # steep:ignore InsufficientKeywordArguments
     assert_encoded = lambda do |payload|
       assert_equal 'test/base64', payload.metadata['encoding']
       Base64.strict_decode64(payload.data)
@@ -1132,7 +1131,7 @@ def test_payload_codec
 
       # Check SA and memo on describe
       desc = handle.describe
-      assert_equal 'new-sa', desc.search_attributes[ATTR_KEY_TEXT]
+      assert_equal 'new-sa', desc.search_attributes&.[](ATTR_KEY_TEXT)
       assert_equal 'new-memo', desc.memo['some-memo-key']
     end
 
@@ -1163,7 +1162,7 @@ def test_payload_codec
         payload_codec: Base64Codec.new
       )
     )
-    client = Temporalio::Client.new(**new_options.to_h)
+    client = Temporalio::Client.new(**new_options.to_h) # steep:ignore InsufficientKeywordArguments
     execute_workflow(
       PayloadCodecWorkflow, true,
       activities: [PayloadCodecActivity],
@@ -1243,7 +1242,7 @@ def test_dynamic
   class ContextFrozenWorkflow < Temporalio::Workflow::Definition
     workflow_init
     def initialize(scenario = :do_nothing)
-      do_bad_thing(scenario)
+      do_bad_thing(scenario) # steep:ignore
     end
 
     def execute(_scenario = :do_nothing)
@@ -1252,7 +1251,7 @@ def execute(_scenario = :do_nothing)
 
     workflow_query
     def some_query(scenario)
-      do_bad_thing(scenario)
+      do_bad_thing(scenario) # steep:ignore
     end
 
     workflow_update
@@ -1262,7 +1261,7 @@ def some_update(scenario)
 
     workflow_update_validator :some_update
     def some_update_validator(scenario)
-      do_bad_thing(scenario)
+      do_bad_thing(scenario) # steep:ignore
     end
 
     def do_bad_thing(scenario)
@@ -1435,7 +1434,7 @@ def execute(timeout = nil)
       queue = Temporalio::Workflow::SizedQueue.new(1)
       queue.push('some-value')
       # Timeout only works on 3.2+
-      raise 'Expected nil' if timeout && !queue.push('some-other-value', timeout:).nil?
+      raise 'Expected nil' if timeout && !queue.push('some-other-value', timeout:).nil? # steep:ignore
 
       queue.pop
     end
@@ -1942,7 +1941,7 @@ def initialize
       self.class.weak_fiber = WeakRef.new(Fiber.current)
       self.class.fiber_object_id = Fiber.current.object_id
 
-      ObjectSpace.define_finalizer(self, self.class.create_finalizer)
+      ObjectSpace.define_finalizer(self, self.class.create_finalizer) # steep:ignore
     end
 
     def execute
@@ -1971,11 +1970,14 @@ def test_confirm_garbage_collect
     loop do
       GC.start
       # Break if the instance is gone
-      break unless ConfirmGarbageCollectWorkflow.weak_fiber.weakref_alive?
+      break unless ConfirmGarbageCollectWorkflow.weak_fiber.weakref_alive? # steep:ignore
 
       # If this is last iteration, flunk w/ the path
       if Time.now - start_time > 10
-        path, cat = GCUtils.find_retaining_path_to(ConfirmGarbageCollectWorkflow.fiber_object_id, max_depth: 12)
+        path, cat = GCUtils.find_retaining_path_to(
+          ConfirmGarbageCollectWorkflow.fiber_object_id || raise,
+          max_depth: 12
+        )
         msg = GCUtils.annotated_path(path, root_category: cat)
         msg += "\nPath:\n#{path.map { |p| "    Item: #{p}" }.join("\n")}"
         # Also display any Thread/Fiber backtraces that are in the path
@@ -1985,7 +1987,7 @@ def test_confirm_garbage_collect
         path.grep(Fiber).each do |fiber|
           msg += "\nFiber trace: #{fiber.backtrace.join("\n")}"
         end
-        msg += "\nOrig fiber trace: #{ConfirmGarbageCollectWorkflow.weak_fiber.backtrace.join("\n")}"
+        msg += "\nOrig fiber trace: #{ConfirmGarbageCollectWorkflow.weak_fiber.backtrace.join("\n")}" # steep:ignore
         flunk msg
       end
       sleep(0.2)
@@ -2001,7 +2003,7 @@ def intercept_workflow(next_interceptor)
 
     class Inbound < Temporalio::Worker::Interceptor::Workflow::Inbound
       def execute(input)
-        Temporalio::Workflow.instance.events << 'interceptor-execute'
+        Temporalio::Workflow.instance.events << 'interceptor-execute' # steep:ignore
         super
       end
     end
@@ -2009,7 +2011,7 @@ def execute(input)
 
   class ContextInstanceWorkflow < Temporalio::Workflow::Definition
     def execute
-      events << 'execute'
+      events << 'execute' # steep:ignore
     end
 
     workflow_query
@@ -2360,7 +2362,7 @@ def test_workflow_metadata
       # Complete and check final details
       handle.execute_update(WorkflowMetadataWorkflow.some_update)
       handle.result
-      assert_equal 'final current details', handle.query(:__temporal_workflow_metadata).current_details
+      assert_equal 'final current details', handle.query(:__temporal_workflow_metadata).current_details # steep:ignore
     end
   end