diff --git a/word-to-markdown.gemspec b/word-to-markdown.gemspec
index c903aa7..4395546 100644
--- a/word-to-markdown.gemspec
+++ b/word-to-markdown.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_dependency('sys-proctable', '~> 1.0')
 
   s.add_development_dependency('minitest', '~> 5.0')
-  s.add_development_dependency('mocha', '~> 1.1')
+  s.add_development_dependency('mocha', '~> 2.0')
   s.add_development_dependency('pry', '~> 0.10')
   s.add_development_dependency('rake', '~> 13.0')
   s.add_development_dependency('rubocop', '~> 1.0')