diff --git a/google-api-client.gemspec b/google-api-client.gemspec
index 3d94d5d23..bb64db7d1 100644
--- a/google-api-client.gemspec
+++ b/google-api-client.gemspec
@@ -19,7 +19,6 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'representable', '~> 2.3.0'
   spec.add_runtime_dependency 'retriable', '~> 2.0'
-  spec.add_runtime_dependency 'activesupport', '>= 3.2'
   spec.add_runtime_dependency 'addressable', '~> 2.3'
   spec.add_runtime_dependency 'mime-types', '>= 1.6'
   spec.add_runtime_dependency 'hurley', '~> 0.1'