diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70d1f53..3486899 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## CHANGE LOG
 
+### v6.4.1
+
+- 将 mime-types 的依赖版本升级到 2.4.3 。 [https://github.com/qiniu/ruby-sdk/pull/113](https://github.com/qiniu/ruby-sdk/pull/113)
+
 ### v6.4.0
 
 - 为 put_with_put_policy() 添加 opts 参数，允许使用 :content_type 键指定上传文件的 mime type。 [https://github.com/qiniu/ruby-sdk/pull/111](https://github.com/qiniu/ruby-sdk/pull/111)
diff --git a/Gemfile.lock b/Gemfile.lock
index c162822..b40bc46 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,9 @@
 PATH
   remote: .
   specs:
-    qiniu (6.4.0)
+    qiniu (6.4.1)
       json (~> 1.7)
-      mime-types (~> 1.19)
+      mime-types (~> 2.4.3)
       rest-client (~> 1.6)
       ruby-hmac (~> 0.4)
 
diff --git a/README.md b/README.md
index 7404533..37d5435 100755
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Qiniu海外接口：up.qiniug.com
 
 在您 Ruby 应用程序的 `Gemfile` 文件中，添加如下一行代码：
 
-    gem 'qiniu', '~> 6.3.1'
+    gem 'qiniu', '~> 6.4.1'
 
 然后，在应用程序所在的目录下，可以运行 `bundle` 安装依赖包：
 
diff --git a/lib/qiniu/version.rb b/lib/qiniu/version.rb
index 2aa467c..2531517 100755
--- a/lib/qiniu/version.rb
+++ b/lib/qiniu/version.rb
@@ -4,7 +4,7 @@ module Qiniu
     module Version
       MAJOR = 6
       MINOR = 4
-      PATCH = 0
+      PATCH = 1
       # Returns a version string by joining <tt>MAJOR</tt>, <tt>MINOR</tt>, and <tt>PATCH</tt> with <tt>'.'</tt>
       #
       # Example