diff --git a/Gemfile b/Gemfile
index 6bc0a8e1..b4fdbee8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby '2.2.2'
 gem 'rake'
 gem 'thor'
 gem 'pry', '~> 0.10.0'
-gem 'activesupport', '~> 4.0', require: false
+gem 'activesupport', '~> 4.2', require: false
 gem 'yajl-ruby', require: false
 
 group :app do
diff --git a/Gemfile.lock b/Gemfile.lock
index 29f0eb2a..21eb62dd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  activesupport (~> 4.0)
+  activesupport (~> 4.2)
   better_errors
   browser
   coffee-script