diff --git a/Gemfile b/Gemfile
index c6eb12031b..af8dfdec07 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.1.6'
 gem 'rack-mini-profiler', group: :development, require: false
 
 gem 'sqlite3' if ENV['DB'].nil? || ENV['DB'] == 'sqlite'
-gem 'mysql2', '~> 0.4.10' if ENV['DB'] == 'mysql'
+gem 'mysql2', '~> 0.5.1' if ENV['DB'] == 'mysql'
 gem 'pg',     '~> 1.0'   if ENV['DB'] == 'postgresql'
 gem 'sassc-rails'