diff --git a/rails-settings.gemspec b/rails-settings.gemspec
index 9fa461f6..51785336 100644
--- a/rails-settings.gemspec
+++ b/rails-settings.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ['lib']
 
-  gem.add_dependency 'activerecord', '>= 3.1'
+  gem.add_dependency 'activerecord', '5.2.2.1'
 
   gem.add_development_dependency 'rake'
   gem.add_development_dependency 'sqlite3'