diff --git a/.github/workflows/postsubmit-miri.yml b/.github/workflows/postsubmit-miri.yml
index b9ae47a0..0dc2cd24 100644
--- a/.github/workflows/postsubmit-miri.yml
+++ b/.github/workflows/postsubmit-miri.yml
@@ -26,7 +26,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Set up nightly Rust toolchain
         # dtolnay/rust-toolchain@nightly
-        uses: dtolnay/rust-toolchain@f2f3c4b315c5bb8415dbb043af44ec90f68ae503
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9  # v1
         with:
           components: |
             rust-src
diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index 16831174..3e330e6a 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -64,12 +64,12 @@ jobs:
         if: runner.os == 'Windows'
       - name: Set up stable Rust toolchain
         # dtolnay/rust-toolchain@stable
-        uses: dtolnay/rust-toolchain@4f366e621dc8fa63f557ca04b8f4361824a35a45
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9  # v1
         with:
           components: clippy, llvm-tools-preview
       - name: Set up nightly Rust toolchain
         # dtolnay/rust-toolchain@nightly
-        uses: dtolnay/rust-toolchain@f2f3c4b315c5bb8415dbb043af44ec90f68ae503
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9  # v1
         with:
           components: rustfmt
       - run: rustup default stable