diff --git a/Gemfile b/Gemfile
index 2b04c14..455eaa6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ gem "aws-s3"
 gem "gmail"
 
 group :development do
-  gem "shoulda"
+  gem "shoulda", ">= 3.3.2"
   gem "bundler"
   gem "pry"
   gem "rspec"