diff --git a/Gemfile b/Gemfile
index 28b537a7b..018be1d4e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -61,7 +61,7 @@ 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]
       when /postgresql/
         gem "pg", "~> 0.18.1", :platforms => [:mri, :mingw, :x64_mingw]
       when /sqlite3/