diff --git a/Gemfile b/Gemfile
index 6eba2e4..7c4bb24 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'hamlit', '>= 2.7.0'
 gem 'hamlit-rails'
 gem 'jquery-rails'
 gem 'kaminari'
-gem 'mysql2', '~> 0.4.4'
+gem 'mysql2', '~> 0.5.3'
 gem 'rails', '~> 5.2.1'
 gem 'rails-i18n'
 gem 'redcarpet'
diff --git a/Gemfile.lock b/Gemfile.lock
index 525a9ca..d77db83 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -348,7 +348,7 @@ GEM
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     multi_json (1.13.1)
-    mysql2 (0.4.10)
+    mysql2 (0.5.3)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (5.0.2)
@@ -499,7 +499,7 @@ DEPENDENCIES
   hamlit-rails
   jquery-rails
   kaminari
-  mysql2 (~> 0.4.4)
+  mysql2 (~> 0.5.3)
   pry-byebug
   rails (~> 5.2.1)
   rails-i18n