diff --git a/delayed_job.gemspec b/delayed_job.gemspec
index 818fec756..99e2b23db 100644
--- a/delayed_job.gemspec
+++ b/delayed_job.gemspec
@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 
 Gem::Specification.new do |spec|
-  spec.add_dependency 'activesupport', ['>= 3.0', '< 5.1']
+  spec.add_dependency 'activesupport', ['>= 3.0', '< 5.2']
   spec.authors        = ['Brandon Keepers', 'Brian Ryckbost', 'Chris Gaffney', 'David Genord II', 'Erik Michaels-Ober', 'Matt Griffin', 'Steve Richert', 'Tobias Lütke']
   spec.description    = 'Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background. It is a direct extraction from Shopify where the job table is responsible for a multitude of core tasks.'
   spec.email          = ['brian@collectiveidea.com']