diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index da7feae..0683a02 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -38,6 +38,19 @@ jobs:
         docker build -t huranit-server .
         docker tag huranit-server hysong4u/huranit-server:latest
         docker push hysong4u/huranit-server:latest
+        
+    - name: Get timestamp
+      uses: gerred/actions/current-time@master
+      id: current-time
+
+    - name: Run string replace
+      uses: frabert/replace-string-action@master
+      id: format-time
+      with:
+        pattern: '[:\.]+'
+        string: "${{ steps.current-time.outputs.time }}"
+        replace-with: '-'
+        flags: 'g'
 
     - name: Deploy to EC2
       env:
@@ -50,6 +63,7 @@ jobs:
           docker pull hysong4u/huranit-server:latest
           existing_container_id=$(sudo docker ps -q --filter "publish=8081")
           [ -n "$existing_container_id" ] && sudo docker stop $existing_container_id && sudo docker rm $existing_container_id
+          sudo docker image prune -f
           docker run -d -p 8081:8081 hysong4u/huranit-server:latest
         EOF