diff --git a/.github/workflows/darker.yml b/.github/workflows/darker.yml
new file mode 100644
index 0000000..e62f0d4
--- /dev/null
+++ b/.github/workflows/darker.yml
@@ -0,0 +1,14 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 
+      - uses: akaihola/darker@1.4.1
+        with:
+          src: "."