diff --git a/Gemfile b/Gemfile
index 53993a1b8..e1c3858ba 100644
--- a/Gemfile
+++ b/Gemfile
@@ -104,7 +104,6 @@ gem 'active_model-errors_details' # Backport from Rails 5, https://github.com/ra
 group :development do
   # deploy
   gem 'mina', '0.3.1' # for fast deployment
-  gem 'puma'
 end
 
 group :development, :test do
@@ -121,6 +120,7 @@ group :development, :test do
   gem 'sdoc',          '0.4.1'  # bundle exec rake doc:rails generates the API under doc/api.
   gem 'railroady',     '1.3.0'  # to generate database diagrams
   gem 'autodoc'
+  gem 'puma'
 end
 
 group :staging do