diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7522735..8d81742 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,3 +15,16 @@ jobs:
 
       - name: treefmt
         run: nix develop --command treefmt --fail-on-change
+
+  check:
+    name: Check
+    needs:
+      - formatting
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v20
+
+      - name: check
+        run: nix flake check --debug