diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 3d8899c..edb47b5 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -8,7 +8,7 @@ jobs:
     name: GitHub Container Registry
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: Login to GitHub Container Registry
         run: echo ${{ secrets.GHCR_ACCESS_TOKEN }} | docker login ghcr.io -u luketainton --password-stdin
       - name: Build image for GitHub Package Registry