diff --git a/Gemfile b/Gemfile
index 6bb753f..d5634d2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,6 +12,7 @@ gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 # Use CoffeeScript for .coffee assets and views
 gem 'coffee-rails', '~> 4.1.0'
+gem 'coffee-script-source', '1.8.0' #for windows
 # See https://github.com/rails/execjs#readme for more supported runtimes
 gem 'therubyracer', platforms: :ruby
 gem 'execjs'
@@ -46,3 +47,4 @@ group :development do
   gem 'spring'
 end
 
+gem 'tzinfo-data', platforms: [:mingw, :mswin] #for windows