diff --git a/carrierwave_backgrounder.gemspec b/carrierwave_backgrounder.gemspec
index 2be5abf..ee8779a 100644
--- a/carrierwave_backgrounder.gemspec
+++ b/carrierwave_backgrounder.gemspec
@@ -19,6 +19,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency "carrierwave", [">= 0.5", "< 2.3"]
 
-  s.add_development_dependency "rspec", ["~> 3.10.0"]
+  s.add_development_dependency "rspec", "~> 3.12.0"
   s.add_development_dependency "rake"
 end