diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 678e5a4..6a5cda8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,6 +14,7 @@ jobs:
       - uses: cachix/install-nix-action@v27
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - run: cargo install num_enum --verbose
       - run: nix flake check
       - run: nix develop --command cargo fmt -- --check
       - run: |