diff --git a/ng-tour-of-heroes/package.json b/ng-tour-of-heroes/package.json
index 9100cab..866c251 100644
--- a/ng-tour-of-heroes/package.json
+++ b/ng-tour-of-heroes/package.json
@@ -19,7 +19,7 @@
     "@angular/animations": "^8.0.0",
     "@angular/common": "^8.0.0",
     "@angular/compiler": "^8.0.0",
-    "@angular/core": "^8.0.0",
+    "@angular/core": "^11.0.5",
     "@angular/forms": "^8.0.0",
     "@angular/platform-browser": "^8.0.0",
     "@angular/platform-browser-dynamic": "^8.0.0",
diff --git a/ng-tour-of-heroes/yarn.lock b/ng-tour-of-heroes/yarn.lock
index 7745bf3..969385b 100644
--- a/ng-tour-of-heroes/yarn.lock
+++ b/ng-tour-of-heroes/yarn.lock
@@ -184,12 +184,12 @@
   dependencies:
     tslib "^1.9.0"
 
-"@angular/core@^8.0.0":
-  version "8.2.3"
-  resolved "https://registry.npm.taobao.org/@angular/core/download/@angular/core-8.2.3.tgz#0567d9db96bfd5b155f011e9f6de39e8d74db954"
-  integrity sha1-BWfZ25a/1bFV8BHp9t456NdNuVQ=
+"@angular/core@^11.0.5":
+  version "11.0.5"
+  resolved "https://registry.yarnpkg.com/@angular/core/-/core-11.0.5.tgz#b8c448c3cd4f6dae7327cc1ba4ee2aa29c8dbc26"
+  integrity sha512-XAXWQi7R3ucZXQwx9QK5jSKJeQyRJ53u2dQDpr7R5stzeCy1a5hrNOkZLg9zOTTPcth/6+FrOrRZP9SMdxtw3w==
   dependencies:
-    tslib "^1.9.0"
+    tslib "^2.0.0"
 
 "@angular/forms@^8.0.0":
   version "8.2.3"
@@ -6429,6 +6429,11 @@ tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0:
   resolved "https://registry.npm.taobao.org/tslib/download/tslib-1.10.0.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ftslib%2Fdownload%2Ftslib-1.10.0.tgz#c3c19f95973fb0a62973fb09d90d961ee43e5c8a"
   integrity sha1-w8GflZc/sKYpc/sJ2Q2WHuQ+XIo=
 
+tslib@^2.0.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.4.0.tgz#7cecaa7f073ce680a05847aa77be941098f36dc3"
+  integrity sha512-d6xOpEDfsi2CZVlPQzGeux8XMwLT9hssAsaPYExaQMuYskwb+x1x7J371tWlbBdWHroy99KnVB6qIkUbs5X3UQ==
+
 tslint@~5.15.0:
   version "5.15.0"
   resolved "https://registry.npm.taobao.org/tslint/download/tslint-5.15.0.tgz#6ffb180986d63afa1e531feb2a134dbf961e27d3"