diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index 92f15de2198c07862e828da20da4dff0d67f0355..10c8c8e8abb181406642153282f78df0552fb924 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -3,7 +3,7 @@
 require "active_record/connection_adapters/abstract_mysql_adapter"
 require "active_record/connection_adapters/mysql/database_statements"
 
-gem "mysql2", ">= 0.4.4", "< 0.6.0"
+gem "mysql2", ">= 0.4.4"
 require "mysql2"
 
 module ActiveRecord
diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index a6dc60342c4b5f014d5e83c89473f5bc9a75d543..8991c547cab0a3497367d588b953b13d33efc79e 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -299,7 +299,7 @@ def rails_version_specifier(gem_version = Rails.gem_version)
       def gem_for_database
         # %w( mysql postgresql sqlite3 oracle frontbase ibm_db sqlserver jdbcmysql jdbcsqlite3 jdbcpostgresql )
         case options[:database]
-        when "mysql"          then ["mysql2", [">= 0.4.4", "< 0.6.0"]]
+        when "mysql"          then ["mysql2", [">= 0.4.4"]]
         when "postgresql"     then ["pg", [">= 0.18", "< 2.0"]]
         when "oracle"         then ["activerecord-oracle_enhanced-adapter", nil]
         when "frontbase"      then ["ruby-frontbase", nil]
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index f33a7bd99dd5deb823f9094012efcb6f0cef054f..14cdd8b5c93fcd524dd931b7285fa82d1ce677ac 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -492,7 +492,7 @@ def test_config_mysql_database
     if defined?(JRUBY_VERSION)
       assert_gem "activerecord-jdbcmysql-adapter"
     else
-      assert_gem "mysql2", "'>= 0.4.4', '< 0.6.0'"
+      assert_gem "mysql2", "'>= 0.4.4'"
     end
   end