diff --git a/.forgejo/workflows/check.yml b/.forgejo/workflows/check.yml
index a207161..80adea4 100644
--- a/.forgejo/workflows/check.yml
+++ b/.forgejo/workflows/check.yml
@@ -33,7 +33,7 @@ jobs:
       - uses: https://git.salame.cl/actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - run: nix --version
       - name: Generate size report
-        uses: https://git.salame.cl/jalil/nix-flake-outputs-size@main
+        uses: "https://git.salame.cl/jalil/nix-flake-outputs-size@5c40a31e3e2ed0ea28f8ba68deca41d05fdf2e71" # main
         with:
           comment-on-pr: ${{ github.ref_name != 'main' }}
           generate-artifact: ${{ github.ref_name == 'main' }}