diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e0af5fa..d7538e0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -35,3 +35,4 @@ jobs:
     - run: cd matrix-client; cabal check
 #    - run: cd matrix-bot; cabal check
     - run: cabal install --installdir=/tmp --overwrite-policy=always --lib all
+    - uses: mrkkrp/ormolu-action@v5