diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..dfb9f19
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+env:
+  DEVELOPER_DIR: /Applications/Xcode_11.3.app/Contents/Developer
+
+jobs:
+
+  build:
+    name: Compile
+    runs-on: macOS-latest
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v1
+
+      - name: xcode version
+        run: xcodebuild -version -sdk
+
+      - name: compile
+        run: swiftc nine41.swift