diff --git a/rotoscope.gemspec b/rotoscope.gemspec
index 820ed2f..561dd28 100644
--- a/rotoscope.gemspec
+++ b/rotoscope.gemspec
@@ -25,6 +25,6 @@ Gem::Specification.new do |s|
   s.extensions = ["ext/rotoscope/extconf.rb"]
 
   s.add_development_dependency("minitest", "~> 5.0")
-  s.add_development_dependency("mocha", "~> 2.4")
+  s.add_development_dependency("mocha", "~> 3.0")
   s.add_development_dependency("rake-compiler", "~> 1.2")
 end