diff --git a/lib/kubernetes-deploy.rb b/lib/kubernetes-deploy.rb
index 055739d3d..fdd44ed23 100644
--- a/lib/kubernetes-deploy.rb
+++ b/lib/kubernetes-deploy.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'active_support/core_ext/object/blank'
+require 'active_support/core_ext/hash/reverse_merge'
 require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/numeric/time'
 require 'active_support/core_ext/string/inflections'