diff --git a/README.md b/README.md
index f97ed9e..ce50503 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ jobs:
         namespace: ${{ secrets.NAMESPACE }}
         deployment: ${{ secrets.DEPLOYMENT }}
         docker_image: sekassel-research/test-image:latest
+        container_id: 0 # optional, defaults to 0
 ```
 
 # Backwards compatibility
diff --git a/main.js b/main.js
index 2947d6f..99de1e2 100644
--- a/main.js
+++ b/main.js
@@ -12,13 +12,14 @@ async function main() {
   const namespace = core.getInput('namespace', {required: true});
   const deployment = core.getInput('deployment', {required: true});
   const dockerImage = core.getInput('docker_image', {required: true});
+  const containerId = core.getInput('container_id', {required: false}) || 0;
 
   await axios.patch(
     `${rancherUrl}/k8s/clusters/${clusterId}/apis/apps/v1/namespaces/${namespace}/deployments/${deployment}`,
     [
       {
         op: 'replace',
-        path: '/spec/template/spec/containers/0/image',
+        path: `/spec/template/spec/containers/${containerId}/image`,
         value: dockerImage,
       },
     ],