diff --git a/Gemfile b/Gemfile
index 569ff4ea3..641b64222 100644
--- a/Gemfile
+++ b/Gemfile
@@ -73,7 +73,7 @@ gem "sprockets-rails",        "3.4.2"
 # Database
 
 group :mysql, optional: true do
-  gem "mysql2", "0.5.5"
+  gem "mysql2", "0.5.6"
 end
 group :postgresql, optional: true do
   gem "pg",     "1.5.3"
diff --git a/Gemfile.lock b/Gemfile.lock
index 606fc7351..2582b5d11 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -420,7 +420,7 @@ GEM
     multi_test (1.1.0)
     multi_xml (0.6.0)
     multipart-post (2.3.0)
-    mysql2 (0.5.5)
+    mysql2 (0.5.6)
     naught (1.1.0)
     net-imap (0.4.12)
       date
@@ -839,7 +839,7 @@ DEPENDENCIES
   mini_magick (= 4.12.0)
   minitest (= 5.18.1)
   mobile-fu (= 1.4.0)
-  mysql2 (= 0.5.5)
+  mysql2 (= 0.5.6)
   net-imap
   net-pop
   net-smtp