diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index 1a900bffd2..b2660531c5 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -57,7 +57,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
         with:
           components: rustfmt
       - name: cargo fmt
@@ -75,7 +75,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2
         with:
           tool: cargo-shear
@@ -148,7 +148,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
         with:
           targets: ${{ matrix.target }}
           components: clippy
@@ -352,7 +352,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
         with:
           targets: ${{ matrix.target }}
 
diff --git a/.github/workflows/rust-release.yml b/.github/workflows/rust-release.yml
index 6f27fbf543..12dd7da82a 100644
--- a/.github/workflows/rust-release.yml
+++ b/.github/workflows/rust-release.yml
@@ -77,7 +77,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
         with:
           targets: ${{ matrix.target }}
 
diff --git a/.github/workflows/sdk.yml b/.github/workflows/sdk.yml
index 0f3a7a194b..7ed65fa36f 100644
--- a/.github/workflows/sdk.yml
+++ b/.github/workflows/sdk.yml
@@ -24,7 +24,7 @@ jobs:
           node-version: 22
           cache: pnpm
 
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
 
       - name: build codex
         run: cargo build --bin codex