Gemfile in dynflow-0.8.11 vs Gemfile in dynflow-0.8.12

@@ -15,5 +15,9 @@
 end
 
 group :mysql do
   gem "mysql2"
 end
+
+if RUBY_VERSION < "2.2.2"
+  gem 'activesupport', '~> 4.2'
+end