diff --git a/forem.gemspec b/forem.gemspec
index 34af830c1..006d7157d 100644
--- a/forem.gemspec
+++ b/forem.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'sass-rails', '~> 4.0'
   s.add_development_dependency 'coffee-rails', '~> 4.0'
 
-  s.add_dependency 'rails', '~> 4.0'
+  s.add_dependency 'rails', '~> 4.0', '!= 4.2.0', '!= 4.2.1', '!= 4.2.2', '!= 4.2.3'
   s.add_dependency 'simple_form', '~> 3.0'
   s.add_dependency 'sanitize', '2.0.6'
   s.add_dependency 'workflow', '1.0.0'