diff --git a/rails.gemspec b/rails.gemspec
index 51d98910f99eb08aa72ecd10667e10d5ca971ee3..411da07f39568b5b30a7ea68f2af4c136dfe92b5 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -41,6 +41,6 @@
   s.add_dependency "actiontext",    version
   s.add_dependency "railties",      version
 
-  s.add_dependency "bundler",         ">= 1.3.0"
+  s.add_dependency "bundler",         ">= 1.15.0"
   s.add_dependency "sprockets-rails", ">= 2.0.0"
 end