diff --git a/mimemagic.gemspec b/mimemagic.gemspec
index e0c3e35..1faffcb 100644
--- a/mimemagic.gemspec
+++ b/mimemagic.gemspec
@@ -19,6 +19,6 @@ Gem::Specification.new do |s|
   s.homepage = 'https://github.com/minad/mimemagic'
   s.license = 'MIT'
 
-  s.add_development_dependency('bacon')
+  s.add_development_dependency('minitest', '~> 5.11')
   s.add_development_dependency('rake')
 end