diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 31000a2..221b721 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
     - name: Build
       run: cargo build --verbose
     - name: Run tests