diff --git a/Gemfile b/Gemfile
index b281e1aa..eaed74bb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,7 +20,7 @@ gem 'puma', '~> 3.0'
 gem 'responders', '~> 2.0'
 
 # as supported databases
-gem 'mysql2'
+# gem 'mysql2'
 gem 'pg'
 
 # for tracking data changes
diff --git a/Gemfile.lock b/Gemfile.lock
index cd7d3f95..5cda6ab7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -304,7 +304,6 @@ GEM
     multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    mysql2 (0.5.2)
     nenv (0.3.0)
     net-http-persistent (3.0.1)
       connection_pool (~> 2.2)
@@ -665,7 +664,6 @@ DEPENDENCIES
   mina
   mini_magick
   money-rails
-  mysql2
   nokogiri (>= 1.8.1)
   omniauth
   omniauth-facebook