diff --git a/MultiRegion/2_UI/cfn/README.md b/MultiRegion/2_UI/cfn/README.md
index e81867b0..30c5024b 100644
--- a/MultiRegion/2_UI/cfn/README.md
+++ b/MultiRegion/2_UI/cfn/README.md
@@ -11,8 +11,9 @@ resources, e.g. user pool, identity pool, etc.
 
 ```bash
 aws cloudformation deploy \
---template-file ticket-service-output.yaml \
---stack-name ticket-service-api \
+--region eu-west-1 \
+--template-file web-ui-stack.yaml \
+--stack-name ticket-service-ui \
 --capabilities CAPABILITY_IAM
 ```
 
diff --git a/MultiRegion/2_UI/package.json b/MultiRegion/2_UI/package.json
index 01e13615..d20a4c32 100644
--- a/MultiRegion/2_UI/package.json
+++ b/MultiRegion/2_UI/package.json
@@ -24,7 +24,7 @@
     "@swimlane/ngx-datatable": "^13.1.0",
     "aws-amplify": "^1.0.11",
     "aws-amplify-angular": "^2.0.3",
-    "core-js": "*",
+    "core-js": "^2.6.0",
     "eslint": "^5.5.0",
     "ng-bootstrap": "*",
     "ngx-facebook": "*",