diff --git a/Gemfile b/Gemfile
index df30fcd0..488efa0b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,4 @@
 source 'http://rubygems.org'
 
-# Specify your gem's dependencies in active_model_serializers.gemspec
+# Specify gem dependencies in active_model_serializers.gemspec
 gemspec
-
-gem "pry"
-gem "simplecov", :require => false
diff --git a/active_model_serializers.gemspec b/active_model_serializers.gemspec
index 70b47192..8d60d43e 100644
--- a/active_model_serializers.gemspec
+++ b/active_model_serializers.gemspec
@@ -19,4 +19,6 @@ Gem::Specification.new do |gem|
 
   gem.add_dependency 'activemodel', '~> 3.0'
   gem.add_development_dependency "rails", "~> 3.0"
+  gem.add_development_dependency "pry"
+  gem.add_development_dependency "simplecov"
 end