diff --git a/ponyracer/package.json b/ponyracer/package.json
index 384868e9a..73b28cdeb 100644
--- a/ponyracer/package.json
+++ b/ponyracer/package.json
@@ -21,12 +21,12 @@
     "@angular/platform-browser-dynamic": "^6.1.0",
     "@angular/router": "^6.1.0",
     "core-js": "^2.5.4",
-    "rxjs": "^6.0.0",
+    "rxjs": "~6.2.0",
     "zone.js": "~0.8.26"
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "~0.8.0-rc.0",
-    "@angular/cli": "~6.2.0-rc.0",
+    "@angular/cli": "~6.2.0-rc.1",
     "@angular/compiler-cli": "^6.1.0",
     "@angular/language-service": "^6.1.0",
     "@types/jasmine": "~2.8.8",
diff --git a/ponyracer/src/environments/environment.ts b/ponyracer/src/environments/environment.ts
index 600fdaf8a..7b4f817ad 100644
--- a/ponyracer/src/environments/environment.ts
+++ b/ponyracer/src/environments/environment.ts
@@ -1,5 +1,5 @@
 // This file can be replaced during build by using the `fileReplacements` array.
-// `ng build ---prod` replaces `environment.ts` with `environment.prod.ts`.
+// `ng build --prod` replaces `environment.ts` with `environment.prod.ts`.
 // The list of file replacements can be found in `angular.json`.
 
 export const environment = {
@@ -7,9 +7,10 @@ export const environment = {
 };
 
 /*
- * In development mode, for easier debugging, you can ignore zone related error
- * stack frames such as `zone.run`/`zoneDelegate.invokeTask` by importing the
- * below file. Don't forget to comment it out in production mode
- * because it will have a performance impact when errors are thrown
+ * For easier debugging in development mode, you can import the following file
+ * to ignore zone related error stack frames such as `zone.run`, `zoneDelegate.invokeTask`.
+ *
+ * This import should be commented out in production mode because it will have a negative impact
+ * on performance if an error is thrown.
  */
 // import 'zone.js/dist/zone-error';  // Included with Angular CLI.