diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index 02b2b46b0..3c6f57722 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -10,7 +10,7 @@ jobs:
     test:
         runs-on: macos-latest
         steps:
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
             - name: Test Chatto
               run: ./scripts/test.sh chatto
             - name: Coverage for Chatto