diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index b625643bd..bc511400a 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -61,7 +61,7 @@ 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
@@ -79,7 +79,7 @@ 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@6f9c7cc51aa54b13cbcbd12f8bbf69d8ba405b4b # v2
         with:
           tool: cargo-shear
@@ -152,7 +152,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
         with:
           targets: ${{ matrix.target }}
           components: clippy
@@ -356,7 +356,7 @@ 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 9dfd41a34..2c16bd65c 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 da74797b7..d4ef39430 100644
--- a/.github/workflows/sdk.yml
+++ b/.github/workflows/sdk.yml
@@ -28,7 +28,7 @@ jobs:
           node-version: 22
           cache: pnpm
 
-      - uses: dtolnay/rust-toolchain@1.90
+      - uses: dtolnay/rust-toolchain@1.100
         with:
           components: rustfmt, clippy