diff --git a/draper.gemspec b/draper.gemspec
index 91cfd83..148a68d 100644
--- a/draper.gemspec
+++ b/draper.gemspec
@@ -21,9 +21,10 @@ Gem::Specification.new do |s|
   s.add_dependency 'rspec', '~> 2.10'
   s.add_dependency 'activesupport', '~> 3.2'
   s.add_dependency 'actionpack', '~> 3.2'
-  s.add_dependency 'ammeter', '~> 0.2.2'
-  s.add_dependency 'guard'
-  s.add_dependency 'guard-rspec'
-  s.add_dependency 'launchy'
-  s.add_dependency 'yard'
+
+  s.add_development_dependency 'ammeter', '~> 0.2.2'
+  s.add_development_dependency 'guard'
+  s.add_development_dependency 'guard-rspec'
+  s.add_development_dependency 'launchy'
+  s.add_development_dependency 'yard'
 end