diff --git a/activerecord_autoreplica.gemspec b/activerecord_autoreplica.gemspec
index 555c89f..9413a71 100644
--- a/activerecord_autoreplica.gemspec
+++ b/activerecord_autoreplica.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   end
 
   s.specification_version = 4
-  s.add_runtime_dependency('activerecord', [">= 4"])
+  s.add_runtime_dependency('activerecord', ["4.2.11.3"])
   s.add_development_dependency('rake', ["~> 12.3"])
   s.add_development_dependency('yard', [">= 0"])
   s.add_development_dependency('sqlite3', [">= 0"])