diff --git a/Gemfile b/Gemfile
index af5c7f0..27e5005 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,6 @@ group :development, :test do
   gem "rake"
   gem "pry"
   gem "rspec-rails", "~> 3.0"
-  gem "puma"
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index a25caa8..70d08b0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,6 +12,7 @@ PATH
       i18n_generators (= 1.2.1)
       jbuilder (~> 2.0)
       jquery-rails (~> 3.1.0)
+      puma
       rails (= 4.1.1)
       sass-rails (~> 4.0.3)
       settingslogic
@@ -225,7 +226,6 @@ DEPENDENCIES
   factory_girl_rails
   fluentd-ui!
   pry
-  puma
   rake
   rspec-rails (~> 3.0)
   simplecov (~> 0.7.1)
diff --git a/fluentd-ui.gemspec b/fluentd-ui.gemspec
index 1fd3a05..3666793 100644
--- a/fluentd-ui.gemspec
+++ b/fluentd-ui.gemspec
@@ -33,4 +33,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency "bundler"
   spec.add_dependency "httpclient"
   spec.add_dependency "settingslogic"
+  spec.add_dependency "puma"
 end