graphql-batch.gemspec in graphql-batch-0.3.5 vs graphql-batch.gemspec in graphql-batch-0.3.7

@@ -19,10 +19,12 @@
   spec.require_paths = ["lib"]
 
   spec.add_runtime_dependency "graphql", ">= 0.8", "< 2"
   spec.add_runtime_dependency "promise.rb", "~> 0.7.2"
 
-  spec.add_development_dependency "byebug" if RUBY_ENGINE == 'ruby'
+  if RUBY_ENGINE == 'ruby' && Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("2.2")
+    spec.add_development_dependency "byebug"
+  end
   spec.add_development_dependency "bundler", "~> 1.10"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest"
 end