diff --git a/acts-as-taggable-on.gemspec b/acts-as-taggable-on.gemspec
index 3af39f2bc..43c2d2375 100644
--- a/acts-as-taggable-on.gemspec
+++ b/acts-as-taggable-on.gemspec
@@ -23,7 +23,6 @@ Gem::Specification.new do |gem|
   end
 
   gem.add_runtime_dependency 'activerecord',  ['>= 3', '< 5']
-  gem.add_runtime_dependency 'actionpack',    ['>= 3', '< 5']
 
   gem.add_development_dependency 'sqlite3'
   gem.add_development_dependency 'mysql2', '~> 0.3.7'