diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4139a66ed..cdb0d0ccc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,10 @@
 ### Unreleased
 *Enhancements*
-
 - Prune resource quotas ([#264](https://github.com/Shopify/kubernetes-deploy/pull/264/files))
 
+*Bug Fixes*
+- Update gemspec to reflect need for ActiveSupport >= 5.0([#270](https://github.com/Shopify/kubernetes-deploy/pull/270))
+
 ### 0.18.1
 *Enhancements*
 - Change the way the resource watcher fetches resources to make it more efficient for large deploys. Deploys with hundreds of resources are expected to see a measurable performance improvement from this change. ([#251](https://github.com/Shopify/kubernetes-deploy/pull/251))
diff --git a/kubernetes-deploy.gemspec b/kubernetes-deploy.gemspec
index c01dbd3bd..353039758 100644
--- a/kubernetes-deploy.gemspec
+++ b/kubernetes-deploy.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.required_ruby_version = '>= 2.3.0'
-  spec.add_dependency "activesupport", ">= 4.2"
+  spec.add_dependency "activesupport", ">= 5.0"
   spec.add_dependency "kubeclient", "~> 2.4"
   spec.add_dependency "rest-client", ">= 1.7" # Minimum required by kubeclient. Remove when kubeclient releases v3.0.
   spec.add_dependency "googleauth", ">= 0.5"