diff --git a/Gemfile b/Gemfile
index 9e6d74ade..293782e0f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -69,7 +69,7 @@ if File.exist?(database_file)
     adapters.each do |adapter|
       case adapter
       when 'mysql2'
-        gem "mysql2", "~> 0.3.11", :platforms => [:mri, :mingw, :x64_mingw]
+        gem "mysql2", "~> 0.4.6", :platforms => [:mri, :mingw, :x64_mingw]
         gem "activerecord-jdbcmysql-adapter", :platforms => :jruby
       when 'mysql'
         gem "activerecord-jdbcmysql-adapter", :platforms => :jruby