diff --git a/README.md b/README.md
index 04f6d4e..45c9b28 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,10 @@ jobs:
       - name: Deploy
         id: deploy
         uses: superfly/fly-pr-review-apps@1.0.0
+
+      - name: Update docker image
+        if: ${{ github.event.action == 'opened' || github.event.action == 'reopened' || github.event.action == 'synchronize' }}
+        run: flyctl image update -a pr-${{ github.event.number }}-myapp-app --skip-health-checks -y
 ```
 
 ## Cleaning up GitHub environments
diff --git a/entrypoint.sh b/entrypoint.sh
index 6719a6f..17c91c7 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -53,6 +53,12 @@ if [ -n "$INPUT_POSTGRES" ]; then
   flyctl postgres attach "$INPUT_POSTGRES" --app "$app" || true
 fi
 
+# Update docker image when subsequent commits are pushed to the PR.
+if [ "$EVENT_TYPE" = "synchronize" ]; then
+  flyctl deploy $detach --config "$config" --app "$app" --region "$region" --image "$image" --strategy immediate --ha=$INPUT_HA --vm-cpu-kind "$INPUT_CPUKIND" --vm-cpus $INPUT_CPU --vm-memory "$INPUT_MEMORY"
+  exit 0
+fi
+
 # Trigger the deploy of the new version.
 echo "Contents of config $config file: " && cat "$config"
 if [ -n "$INPUT_VM" ]; then