diff --git a/lib/validates_timeliness.rb b/lib/validates_timeliness.rb
index 7a0111b..506e036 100644
--- a/lib/validates_timeliness.rb
+++ b/lib/validates_timeliness.rb
@@ -1,5 +1,4 @@
 require 'date'
-require 'active_support/time_with_zone'
 require 'active_support/core_ext/hash/except'
 require 'active_support/core_ext/string/conversions'
 require 'active_support/core_ext/date/acts_like'