diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3f688f3..26abb3c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -22,6 +22,9 @@ jobs:
       - name: Format check
         run: |
           nix develop -j auto -c treefmt --fail-on-change
+      - name: Hlint
+        run: |
+          nix develop -j auto -c hlint src
       - name: Build
         id: build
         run: |