diff --git a/Gemfile b/Gemfile
index 76c740f..27a4234 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,7 +22,7 @@ group :doc do
 end
 
 group :production do
-  gem 'mysql2' # Database
+  gem 'mysql2', '~> 0.3.18' # Database
 end
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index fce3f2a..3b187db 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -161,7 +161,7 @@ GEM
     multi_json (1.11.2)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
-    mysql2 (0.4.2)
+    mysql2 (0.3.20)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (3.0.2)
@@ -318,7 +318,7 @@ DEPENDENCIES
   httparty
   identicon
   jquery-rails
-  mysql2
+  mysql2 (~> 0.3.18)
   omniauth-oauth2 (= 1.3.1)
   paperclip
   rails (= 4.2.4)