diff --git a/Gemfile b/Gemfile
index 34766dd150..e949e203a4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -33,10 +33,7 @@ gem 'nokogiri'
 # style
 gem 'bootstrap-sass', '~> 3.4'
 gem 'sass-rails',     '5.0.6'   # sass style
-
-# js
-
-gem 'coffee-rails',    '4.1.0'  # coffeescript support
+gem 'coffee-rails', '~> 4.2'
 gem 'jquery-rails',    '4.0.4'  # jquery
 gem 'selectize-rails', '0.12.1' # include selectize.js for select
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 0dbb10328a..94f1d16b19 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,9 +147,9 @@ GEM
     coderay (1.1.0)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
-    coffee-rails (4.1.0)
+    coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
-      railties (>= 4.0.0, < 5.0)
+      railties (>= 4.0.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -466,7 +466,7 @@ DEPENDENCIES
   cancancan
   capybara
   coderay (= 1.1.0)
-  coffee-rails (= 4.1.0)
+  coffee-rails (~> 4.2)
   company_register!
   countries
   daemons-rails (= 1.2.1)