diff --git a/ar-octopus.gemspec b/ar-octopus.gemspec
index ccff3992..9200160e 100644
--- a/ar-octopus.gemspec
+++ b/ar-octopus.gemspec
@@ -21,6 +21,8 @@ Gem::Specification.new do |s|
                            'Octopus now stores schema version information in each shard and migrations will not ' \
                            'work properly unless this task is invoked.'
 
+  s.required_ruby_version = '>= 2.1.0'
+
   s.add_dependency 'activerecord', '>= 4.0.0'
   s.add_dependency 'activesupport', '>= 4.0.0'