diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..479db36
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  swift-package-test:
+    name: Swift Package Test (LocalPackage)
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run swift test
+        working-directory: LocalPackage
+        run: swift test
+
+  macos-build:
+    name: macOS Build (KeyMapRender)
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build app
+        run: xcodebuild -scheme KeyMapRender -destination 'platform=macOS' build
diff --git a/LocalPackage/Package.swift b/LocalPackage/Package.swift
index 29bc587..6ad9d9c 100644
--- a/LocalPackage/Package.swift
+++ b/LocalPackage/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 6.2
+// swift-tools-version: 6.0
 
 import PackageDescription
 
diff --git a/README.md b/README.md
index 09f3e41..2a7fcd6 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # KeyMapRender
 
+[![CI](https://github.com/shsw228/KeyMapRender/actions/workflows/ci.yml/badge.svg)](https://github.com/shsw228/KeyMapRender/actions/workflows/ci.yml)
+
 [日本語版 README](README.ja.md)
 
 KeyMapRender is a macOS utility that shows a semi-transparent keyboard overlay while a configurable key is held down (or toggled), focused on Vial/VIA-compatible keyboards.