diff --git a/Gemfile b/Gemfile
index 0b91507..b41eb1c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ gemspec
 source :rubygems
 
 group :development do
-  gem 'activerecord'
+  gem 'activerecord', '>= 5.2.8.1'
   gem 'bson_ext'
   gem 'guard'
   gem 'guard-rspec'