diff --git a/.forgejo/workflows/cache.yaml b/.forgejo/workflows/cache.yaml
index d84cf0c..d738ab2 100644
--- a/.forgejo/workflows/cache.yaml
+++ b/.forgejo/workflows/cache.yaml
@@ -7,7 +7,7 @@ jobs:
       - name: Checkout repo
         uses: actions/checkout@v5
       - name: Install nix
-        uses: https://github.com/cachix/install-nix-action
+        uses: https://github.com/cachix/install-nix-action@v31
       - name: Setup Attic cache
         uses: https://github.com/ryanccn/attic-action@v0
         with: