diff --git a/thinking-sphinx.gemspec b/thinking-sphinx.gemspec
index 594883dba..4c96dfa60 100644
--- a/thinking-sphinx.gemspec
+++ b/thinking-sphinx.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
 
   s.add_runtime_dependency 'activerecord', '>= 3.0.3'
-  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 'actionpack',    '>= 3.0.3'