diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index c203e2b74..abfe28fd7 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -67,7 +67,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.93.0
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           components: rustfmt
       - name: cargo fmt
@@ -83,7 +83,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.93.0
+      - uses: dtolnay/rust-toolchain@1.100.0
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2
         with:
           tool: cargo-shear
@@ -98,7 +98,7 @@ jobs:
     if: ${{ needs.changed.outputs.argument_comment_lint_package == 'true' || github.event_name == 'push' }}
     steps:
       - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@1.93.0
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           toolchain: nightly-2025-09-18
           components: llvm-tools-preview, rustc-dev, rust-src
@@ -148,7 +148,7 @@ jobs:
         run: |
           sudo DEBIAN_FRONTEND=noninteractive apt-get update
           sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends pkg-config libcap-dev
-      - uses: dtolnay/rust-toolchain@1.93.0
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           toolchain: nightly-2025-09-18
           components: llvm-tools-preview, rustc-dev, rust-src
@@ -272,7 +272,7 @@ jobs:
             fi
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends "${packages[@]}"
           fi
-      - uses: dtolnay/rust-toolchain@1.93.0
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           targets: ${{ matrix.target }}
           components: clippy
@@ -615,7 +615,7 @@ jobs:
       - name: Install DotSlash
         uses: facebook/install-dotslash@v2
 
-      - uses: dtolnay/rust-toolchain@1.93.0
+      - uses: dtolnay/rust-toolchain@1.100.0
         with:
           targets: ${{ matrix.target }}