diff --git a/qiniu.gemspec b/qiniu.gemspec
index 2c1db4e..d51f268 100755
--- a/qiniu.gemspec
+++ b/qiniu.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "fakeweb", "~> 1.3"
   gem.add_runtime_dependency "json", "~> 1.7"
   gem.add_runtime_dependency "rest-client", "~> 1.6"
-  gem.add_runtime_dependency "mime-types", "~> 1.19"
+  gem.add_runtime_dependency "mime-types", "~> 2.4.3"
   gem.add_runtime_dependency "ruby-hmac", "~> 0.4"
   gem.add_runtime_dependency "jruby-openssl", "~> 0.7" if RUBY_PLATFORM == "java"
 end