diff --git a/aio/package.json b/aio/package.json
index 80a87e0662..2eb9d03adb 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -98,6 +98,7 @@
     "@angular/cli": "^6.0.0-rc.4",
     "@angular/compiler": "6.0.0-rc.5",
     "@angular/compiler-cli": "6.0.0-rc.5",
+    "@angular/language-service": "6.0.0-rc.5",
     "@types/jasmine": "^2.5.52",
     "@types/jasminewd2": "^2.0.3",
     "@types/node": "~6.0.60",
diff --git a/aio/yarn.lock b/aio/yarn.lock
index f31fca9bd4..2a8bfd56a5 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -169,6 +169,10 @@
   dependencies:
     tslib "^1.9.0"
 
+"@angular/language-service@6.0.0-rc.5":
+  version "6.0.0-rc.5"
+  resolved "https://registry.yarnpkg.com/@angular/language-service/-/language-service-6.0.0-rc.5.tgz#19c24928aba82c6175e833d5fbeb6f82c58d72c0"
+
 "@angular/material@6.0.0-rc.11":
   version "6.0.0-rc.11"
   resolved "https://registry.yarnpkg.com/@angular/material/-/material-6.0.0-rc.11.tgz#7226d3ac92c3ca1bfdc0a95a46e6f93dc9fa0e2e"