diff --git a/github_changelog_generator.gemspec b/github_changelog_generator.gemspec
index a3f53dc..afa79b7 100644
--- a/github_changelog_generator.gemspec
+++ b/github_changelog_generator.gemspec
@@ -24,10 +24,11 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_runtime_dependency "rake", ">= 10.0"
-  spec.add_runtime_dependency "bundler", ">= 1.7"
   spec.add_runtime_dependency("github_api", ["~> 0.12"])
   spec.add_runtime_dependency("colorize", ["~> 0.7"])
-  spec.add_runtime_dependency("overcommit", ">= 0.31")
-  spec.add_runtime_dependency("rubocop", ">= 0.31")
-  spec.add_runtime_dependency("rspec", ">= 3.2")
+
+  spec.add_development_dependency("overcommit", ">= 0.31")
+  spec.add_development_dependency("rspec", ">= 3.2")
+  spec.add_development_dependency "bundler", ">= 1.7"
+  spec.add_development_dependency("rubocop", ">= 0.31")
 end