diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
new file mode 100644
index 0000000..76c1ec7
--- /dev/null
+++ b/.github/workflows/verify.yml
@@ -0,0 +1,25 @@
+# https://help.github.com/en/articles/workflow-syntax-for-github-actions
+
+on: "pull_request"
+name: Connection test
+jobs:
+  ssh:
+    name: Connect to github.com on ${{ matrix.platform }}
+    runs-on: ${{ matrix.platform }}
+    strategy:
+      matrix:
+        platform:
+        - "Windows-latest"
+        - "macOS-latest"
+        - "Ubuntu-latest"
+      fail-fast: false
+    steps:
+    - name: Install SSH key
+      uses: shimataro/ssh-key-action@development
+      with:
+        private-key: ${{ secrets.SSH_KEY }}
+        public-key: ${{ secrets.SSH_KEY_PUBLIC }}
+        name: 'id_rsa' # optional
+        known-hosts: ${{ secrets.KNOWN_HOSTS }} # optional
+    - name: git clone through SSH
+      run: git clone git@github.com:shimataro/ssh-key-action.git tmp
diff --git a/README.md b/README.md
index 9de787e..2c14df7 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Install SSH key
 
 [![Build][image-build]][link-build]
+[![Connection test][image-connection-test]][link-connection-test]
 [![Release][image-release]][link-release]
 [![License][image-license]][link-license]
 
@@ -40,6 +41,8 @@ See [CHANGELOG.md](CHANGELOG.md).
 
 [image-build]: https://github.com/shimataro/ssh-key-action/workflows/Build/badge.svg
 [link-build]: https://github.com/shimataro/ssh-key-action
+[image-connection-test]: https://github.com/shimataro/ssh-key-action/workflows/Connection%20test/badge.svg
+[link-connection-test]: https://github.com/shimataro/ssh-key-action
 [image-release]: https://img.shields.io/github/release/shimataro/ssh-key-action.svg
 [link-release]: https://github.com/shimataro/ssh-key-action/releases
 [image-license]: https://img.shields.io/github/license/shimataro/ssh-key-action.svg