diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d4b7675..31bdb39 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.91.0
+      - uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: rustfmt, clippy
 
@@ -75,7 +75,7 @@ jobs:
     if: needs.changes.outputs.rust == 'true'
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.91.0
+      - uses: dtolnay/rust-toolchain@1.99.0
 
       - name: Cache Rust dependencies
         uses: Swatinem/rust-cache@v2
@@ -91,7 +91,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@1.91.0
+        uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: rustfmt, clippy
 
@@ -131,7 +131,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@1.91.0
+        uses: dtolnay/rust-toolchain@1.99.0
 
       - name: Install cargo-nextest
         uses: taiki-e/install-action@v2
@@ -151,7 +151,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@1.91.0
+        uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: llvm-tools
 
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 08df85d..3996885 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@1.91.0
+        uses: dtolnay/rust-toolchain@1.99.0
 
       - uses: github/codeql-action/init@v4
         with:
diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
index 09d0b69..1d614da 100644
--- a/.github/workflows/copilot-setup-steps.yml
+++ b/.github/workflows/copilot-setup-steps.yml
@@ -29,7 +29,7 @@ jobs:
     # If you do not check out your code, Copilot will do this for you.
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.91.0
+      - uses: dtolnay/rust-toolchain@1.99.0
       - uses: extractions/setup-just@v3
 
       - name: Set up Python for pre-commit
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 5ffb9fc..698928a 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -28,7 +28,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@1.91.0
+        uses: dtolnay/rust-toolchain@1.99.0
         with:
           components: rustfmt, clippy
 
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index 5e8643d..18372d7 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@1.91.0
+        uses: dtolnay/rust-toolchain@1.99.0
 
       - uses: taiki-e/install-action@v2
         with: