diff --git a/Gemfile b/Gemfile
index a5cbb60..4ca57e1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,10 +9,19 @@ source 'https://rubygems.org'
 
 gemspec name: 'rackstash'
 
+gem 'rake'
+
 group :test do
+  gem 'rspec', '~> 3.0'
+  gem 'coveralls', '~> 0.8.20'
+
   gem 'rack', ENV['RACK_VERSION'] ? "~> #{ENV['RACK_VERSION']}" : nil
 end
 
+group :doc do
+  gem 'yard', '~> 0.9'
+end
+
 if RUBY_ENGINE == 'truffleruby'
   # Truffleruby requires a prerelease of concurrent-ruby currently
   gem 'concurrent-ruby', '>= 1.1.0.pre2'
diff --git a/rackstash.gemspec b/rackstash.gemspec
index d54dd85..bf83bfe 100644
--- a/rackstash.gemspec
+++ b/rackstash.gemspec
@@ -38,11 +38,4 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_dependency 'concurrent-ruby', '~> 1.0', '>= 1.0.2'
-
-  spec.add_development_dependency 'bundler', '>= 1.12'
-  spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'rspec', '~> 3.0'
-
-  spec.add_development_dependency 'coveralls', '~> 0.8.20'
-  spec.add_development_dependency 'yard', '~> 0.9'
 end