diff --git a/thinking-sphinx.gemspec b/thinking-sphinx.gemspec
index 7a6383415..19b78ce37 100644
--- a/thinking-sphinx.gemspec
+++ b/thinking-sphinx.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency 'activerecord', ['< 3.0.0', '>= 1.15.6']
   s.add_runtime_dependency 'after_commit', '>= 1.0.7'
-  s.add_runtime_dependency 'riddle',       '>= 1.3.3'
+  s.add_runtime_dependency 'riddle',       '>= 1.5.0'
   s.add_runtime_dependency 'builder',      '>= 2.1.2'
 
   s.add_development_dependency 'cucumber',      '1.0.2'