diff --git a/Cargo.lock b/Cargo.lock
index b84370d8133ee..f217826dc8c58 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3766,7 +3766,7 @@ version = "0.0.0"
 dependencies = [
  "anyhow",
  "async-trait",
- "base64 0.13.1",
+ "base64 0.21.5",
  "bytes",
  "bytesize",
  "chrono",
@@ -4184,7 +4184,7 @@ dependencies = [
  "assert_cmd",
  "async-trait",
  "axum",
- "base64 0.13.1",
+ "base64 0.21.5",
  "bytes",
  "bytesize",
  "cc",
@@ -4414,7 +4414,7 @@ version = "0.0.0"
 dependencies = [
  "anyhow",
  "axum",
- "base64 0.13.1",
+ "base64 0.21.5",
  "clap",
  "derivative",
  "futures",
@@ -4833,7 +4833,7 @@ dependencies = [
  "aws-credential-types",
  "aws-sdk-s3",
  "aws-types",
- "base64 0.13.1",
+ "base64 0.21.5",
  "bytes",
  "deadpool-postgres",
  "differential-dataflow",
@@ -5917,7 +5917,7 @@ dependencies = [
  "aws-credential-types",
  "aws-sdk-sts",
  "aws-types",
- "base64 0.13.1",
+ "base64 0.21.5",
  "bytes",
  "dec",
  "derivative",
diff --git a/src/catalog/Cargo.toml b/src/catalog/Cargo.toml
index 345b8016cadcc..bf1d75916493f 100644
--- a/src/catalog/Cargo.toml
+++ b/src/catalog/Cargo.toml
@@ -62,7 +62,7 @@ uuid = "1.2.2"
 workspace-hack = { version = "0.0.0", path = "../workspace-hack" }
 
 [dev-dependencies]
-base64 = "0.13.1"
+base64 = "0.21.5"
 insta = "1.32"
 mz-postgres-util = { path = "../postgres-util" }
 rand = "0.8.5"
diff --git a/src/environmentd/Cargo.toml b/src/environmentd/Cargo.toml
index 0903f8e9ea71c..4e055b390d349 100644
--- a/src/environmentd/Cargo.toml
+++ b/src/environmentd/Cargo.toml
@@ -19,7 +19,7 @@ askama = { version = "0.11.1", default-features = false, features = [
 ] }
 async-trait = "0.1.68"
 axum = { version = "0.6.20", features = ["headers", "ws"] }
-base64 = "0.13.1"
+base64 = "0.21.5"
 bytes = "1.3.0"
 bytesize = "1.1.0"
 chrono = { version = "0.4.23", default-features = false, features = ["std"] }
diff --git a/src/frontegg-auth/Cargo.toml b/src/frontegg-auth/Cargo.toml
index d319b6af1b9e5..6922e1ab59ee6 100644
--- a/src/frontegg-auth/Cargo.toml
+++ b/src/frontegg-auth/Cargo.toml
@@ -11,7 +11,7 @@ workspace = true
 
 [dependencies]
 anyhow = "1.0.66"
-base64 = "0.13.1"
+base64 = "0.21.5"
 clap = { version = "3.2.24", features = ["wrap_help", "env", "derive"] }
 derivative = "2.2.0"
 futures = "0.3.25"
diff --git a/src/persist/Cargo.toml b/src/persist/Cargo.toml
index 1f5ce79e2cf9e..8ddf02551584b 100644
--- a/src/persist/Cargo.toml
+++ b/src/persist/Cargo.toml
@@ -30,7 +30,7 @@ aws-config = { version = "1.1.1", default-features = false }
 aws-credential-types = { version = "1.1.1", features = ["hardcoded-credentials"] }
 aws-sdk-s3 = { version = "1.8.0", default-features = false, features = ["rt-tokio"]  }
 aws-types = "1.1.1"
-base64 = "0.13.1"
+base64 = "0.21.5"
 bytes = "1.3.0"
 deadpool-postgres = "0.10.3"
 differential-dataflow = "0.12.0"
diff --git a/src/storage-types/Cargo.toml b/src/storage-types/Cargo.toml
index 9721c692b3820..d6d7628080bfb 100644
--- a/src/storage-types/Cargo.toml
+++ b/src/storage-types/Cargo.toml
@@ -64,7 +64,7 @@ uuid = { version = "1.2.2", features = ["serde", "v4"] }
 workspace-hack = { version = "0.0.0", path = "../workspace-hack" }
 
 [dev-dependencies]
-base64 = "0.13.1"
+base64 = "0.21.5"
 
 [build-dependencies]
 prost-build = "0.11.2"