diff --git a/Gemfile b/Gemfile
index 8b2f4de..91d2fa6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,6 +10,10 @@ group :development, :test do
   gem "rspec-rails", "~> 2.99"
 end
 
+group :development do
+  gem 'i18n_generators', '1.2.1'
+end
+
 group :test do
   gem "factory_girl_rails"
   gem "database_cleaner", "~> 1.2.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 696d221..10d96ab 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,6 @@ PATH
       font-awesome-rails
       haml-rails (~> 0.5.3)
       httpclient
-      i18n_generators (= 1.2.1)
       jbuilder (~> 2.0)
       jquery-rails (~> 3.1.0)
       kramdown (> 1.0.0)
@@ -238,6 +237,7 @@ DEPENDENCIES
   database_cleaner (~> 1.2.0)
   factory_girl_rails
   fluentd-ui!
+  i18n_generators (= 1.2.1)
   poltergeist
   pry
   rake
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 6d64374..1657ddb 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -27,7 +27,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency "fluentd", "~> 0.10.51"
   spec.add_dependency 'rails', '4.1.4'
   spec.add_dependency 'sucker_punch', "~> 1.0.5"
-  spec.add_dependency 'i18n_generators', '1.2.1'
   spec.add_dependency 'bcrypt', '~> 3.1.5'
   spec.add_dependency 'addressable'
   spec.add_dependency "font-awesome-rails"