diff --git a/.github/workflows/regression.yml b/.github/workflows/regression.yml
new file mode 100644
index 0000000..e5aaba6
--- /dev/null
+++ b/.github/workflows/regression.yml
@@ -0,0 +1,19 @@
+name: Regression
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup veryl
+        uses: veryl-lang/setup-veryl@v1
+      - name: Format check
+        run: veryl fmt --check
+      - name: Build check
+        run: veryl check