diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 4997cba..cfa98e2 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Check out Repository
-        uses: https://git.konstantinfickel.de/actions/checkout@v4
+        uses: https://git.konstantinfickel.de/actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - run: nix --version
       - run: nix flake check