diff --git a/fog.gemspec b/fog.gemspec
index ebe491955..c0a9fd50f 100644
--- a/fog.gemspec
+++ b/fog.gemspec
@@ -86,7 +86,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency("docker-api", ">= 1.13.6")
   s.add_development_dependency("fission")
-  s.add_development_dependency("mime-types", "<=2.99.1")
+  s.add_development_dependency("mime-types")
   s.add_development_dependency("minitest")
   s.add_development_dependency("minitest-stub-const")
   s.add_development_dependency("opennebula")