diff --git a/gollum.gemspec b/gollum.gemspec
index a573c4fb..e4c2f38b 100644
--- a/gollum.gemspec
+++ b/gollum.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'useragent', '~> 0.6.0'
 
   s.add_development_dependency 'rack-test', '~> 0.6.2'
-  s.add_development_dependency 'shoulda', '~> 3.5.0'
+  s.add_development_dependency 'shoulda', ['>= 3.4.0', '< 3.5.0']
   s.add_development_dependency 'minitest-reporters', '~> 0.14.16'
 
   # = MANIFEST =