diff --git a/.github/workflows/build-bundles.yml b/.github/workflows/build-bundles.yml
index e580222..31e8ec5 100644
--- a/.github/workflows/build-bundles.yml
+++ b/.github/workflows/build-bundles.yml
@@ -36,7 +36,7 @@ jobs:
           cache: npm
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@4360b52568e2003a75bf9bc1d59f33a8e3fc893c # stable
 
       - name: Cache Rust artifacts
         uses: Swatinem/rust-cache@v2