diff --git a/.gitea/workflows/flake.yaml b/.gitea/workflows/flake.yaml
index 1667866..7f37547 100644
--- a/.gitea/workflows/flake.yaml
+++ b/.gitea/workflows/flake.yaml
@@ -16,7 +16,7 @@ jobs:
         run: |
           apt-get update
           apt-get install -y sudo
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@8887e596b4ee1134dae06b98d573bd674693f47c # v26
       - name: lint
         run: |
           nix fmt