diff --git a/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/package.json b/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/package.json
index 6eb96b8..26f2c42 100644
--- a/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/package.json
+++ b/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/package.json
@@ -14,7 +14,7 @@
     "@angular/animations": "9.0.0-rc.5",
     "@angular/common": "9.0.0-rc.5",
     "@angular/compiler": "9.0.0-rc.5",
-    "@angular/core": "9.0.0-rc.5",
+    "@angular/core": "11.0.5",
     "@angular/forms": "9.0.0-rc.5",
     "@angular/platform-browser": "9.0.0-rc.5",
     "@angular/platform-browser-dynamic": "9.0.0-rc.5",
diff --git a/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/yarn.lock b/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/yarn.lock
index cd5b1b4..91042b9 100644
--- a/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/yarn.lock
+++ b/net.akehurst.kotlin.example.addressbook/client-angular/src/angular/yarn.lock
@@ -174,10 +174,12 @@
   resolved "https://registry.yarnpkg.com/@angular/compiler/-/compiler-9.0.0-rc.5.tgz#4771e04d8a4c25cfe195232b194dd8ac61bdce42"
   integrity sha512-0CWPDbpHoWm/ZN40/Y+iPikRQbhd50keoE4xSAYM2SS1pnomJaF2ytIL9xfc3BMGGKgiX3aIk57B0m4yDYTiBw==
 
-"@angular/core@9.0.0-rc.5":
-  version "9.0.0-rc.5"
-  resolved "https://registry.yarnpkg.com/@angular/core/-/core-9.0.0-rc.5.tgz#4d6140e3bf14b7be86e2045bf6a657ec7b4ef211"
-  integrity sha512-g9IhWc5znQGNj056Qtk1OnNYDQAIT8ti++xgcAYJ2Z1Yp0Bkb8gL7WexiuwKxmilHmZxnZiRHsPfSlKl0Hxp5g==
+"@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 "^2.0.0"
 
 "@angular/forms@9.0.0-rc.5":
   version "9.0.0-rc.5"
@@ -7605,6 +7607,11 @@ tslib@1.10.0, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.10.0.tgz#c3c19f95973fb0a62973fb09d90d961ee43e5c8a"
   integrity sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==
 
+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@5.18.0:
   version "5.18.0"
   resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.18.0.tgz#f61a6ddcf372344ac5e41708095bbf043a147ac6"