diff --git a/Dockerfile b/Dockerfile
index 3ff5c6d..93e707f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM appleboy/drone-ssh:linux-amd64
+FROM appleboy/drone-ssh:1.6.3-linux-amd64
 
 ADD entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
diff --git a/README.md b/README.md
index 98336a2..e14a81e 100644
--- a/README.md
+++ b/README.md
@@ -164,6 +164,21 @@ Multiple Hosts
         ls -al
 ```
 
+Multiple Hosts with differebt port
+
+```diff
+  - name: multiple host
+    uses: appleboy/ssh-action@master
+    with:
+-     host: "foo.com"
++     host: "foo.com:1234,bar.com:5678"
+      username: ${{ secrets.USERNAME }}
+      key: ${{ secrets.KEY }}
+      script: |
+        whoami
+        ls -al
+```
+
 Synchronous execution on multiple hosts
 
 ```diff