diff --git a/paper_trail.gemspec b/paper_trail.gemspec
index b3b8543d..d429e098 100644
--- a/paper_trail.gemspec
+++ b/paper_trail.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
 
   s.required_rubygems_version = '>= 1.3.6'
-  s.required_ruby_version = '>= 1.9'
+  s.required_ruby_version = '>= 1.9.3'
 
   s.add_dependency 'activerecord', ['>= 3.0', '< 6.0']
   s.add_dependency 'activesupport', ['>= 3.0', '< 6.0']