diff --git a/Rakefile b/Rakefile
index 631abbb5c..ff61fc6cf 100644
--- a/Rakefile
+++ b/Rakefile
@@ -27,14 +27,14 @@ end
 desc "update SRI hashes"
 task :update_hashes do
   map = {
-    'react.js': 'dev',
-    'react.min.js': 'prod',
-    'react-with-addons.js': 'addons_dev',
-    'react-with-addons.min.js': 'addons_prod',
-    'react-dom.js': 'dom_dev',
-    'react-dom.min.js': 'dom_prod',
-    'react-dom-server.js': 'dom_server_dev',
-    'react-dom-server.min.js': 'dom_server_prod'
+    'react.js' => 'dev',
+    'react.min.js' => 'prod',
+    'react-with-addons.js' => 'addons_dev',
+    'react-with-addons.min.js' => 'addons_prod',
+    'react-dom.js' => 'dom_dev',
+    'react-dom.min.js' => 'dom_prod',
+    'react-dom-server.js' => 'dom_server_dev',
+    'react-dom-server.min.js' => 'dom_server_prod'
   }
   site_config = YAML.load_file('_config.yml')
   map.each do |file, key|