diff --git a/.github/workflows/update-flux.yaml b/.github/workflows/update-flux.yaml
index 27f1b53f..6c147db0 100644
--- a/.github/workflows/update-flux.yaml
+++ b/.github/workflows/update-flux.yaml
@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
 
       - name: Setup Flux CLI
         uses: fluxcd/flux2/action@main