diff --git a/quickstart-with-apollo/src/tsconfig.app.json b/quickstart-with-apollo/src/tsconfig.app.json
index 6527c3e..be001bd 100755
--- a/quickstart-with-apollo/src/tsconfig.app.json
+++ b/quickstart-with-apollo/src/tsconfig.app.json
@@ -3,7 +3,7 @@
     "declaration": false,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "lib": ["es6", "dom"],
+    "lib": ["es6", "dom", "esnext"],
     "mapRoot": "./",
     "module": "es6",
     "moduleResolution": "node",
diff --git a/subscriptions-with-apollo/src/tsconfig.json b/subscriptions-with-apollo/src/tsconfig.json
index 6527c3e..308b1ed 100755
--- a/subscriptions-with-apollo/src/tsconfig.json
+++ b/subscriptions-with-apollo/src/tsconfig.json
@@ -3,7 +3,7 @@
     "declaration": false,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "lib": ["es6", "dom"],
+    "lib": ["es6", "dom", "esnext" ],
     "mapRoot": "./",
     "module": "es6",
     "moduleResolution": "node",