diff --git a/README.md b/README.md
index 0aca3c91c0..37462abe29 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Angular.io is currently the preview site for Angular 2. This site also includes
 
 
 ## Development Setup
-1. Install Harp `sudo npm install -g harp`
+1. Install Harp `sudo npm install -g harp@v0.15.2`
 2. cd into root directory `angular.io/`
 3. run `harp server`
 4. Open this url in the browser: [http://localhost:9000/](http://localhost:9000/)
@@ -25,4 +25,4 @@ Angular.io is currently the preview site for Angular 2. This site also includes
 
 
 ## License
-Powered by Google ©2010-2015. Code licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0). Documentation licensed under [CC BY 3.0](http://creativecommons.org/licenses/by/3.0/).
\ No newline at end of file
+Powered by Google ©2010-2015. Code licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0). Documentation licensed under [CC BY 3.0](http://creativecommons.org/licenses/by/3.0/).