diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..9c10514
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,20 @@
+name: lint
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: google/dart:latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: pub get
+      - run: \
+        output=$(dartfmt --dry-run lib/**/*.dart)
+        if [ -z $output]
+          then exit 0
+        else
+          exit 1