diff --git a/Gemfile b/Gemfile
index e67bb8cf5..842769cf8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -73,7 +73,7 @@ gem "sprockets-rails",        "3.4.2"
 # Database
 
 group :mysql, optional: true do
-  gem "mysql2", "0.5.4"
+  gem "mysql2", "0.5.5"
 end
 group :postgresql, optional: true do
   gem "pg",     "1.4.1"
diff --git a/Gemfile.lock b/Gemfile.lock
index 47f0bab0a..517b0f966 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -439,7 +439,7 @@ GEM
     multi_test (0.1.2)
     multi_xml (0.6.0)
     multipart-post (2.3.0)
-    mysql2 (0.5.4)
+    mysql2 (0.5.5)
     naught (1.1.0)
     net-imap (0.3.6)
       date
@@ -841,7 +841,7 @@ DEPENDENCIES
   mini_magick (= 4.11.0)
   minitest (= 5.15.0)
   mobile-fu (= 1.4.0)
-  mysql2 (= 0.5.4)
+  mysql2 (= 0.5.5)
   net-imap
   net-pop
   net-smtp