diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0f244f3..3f72acb 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,7 +12,7 @@ jobs:
     steps:
       # Checkout code
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Build and run ICAT Docker Compose stack
         run: docker compose up -d opensearch seed_opensearch scigateway-auth