diff --git a/Gemfile b/Gemfile
index 789f5f77..34b113c6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,7 @@ gem 'paper_trail'
 
 # for upload management
 gem 'carrierwave'
+gem 'mini_magick'
 
 # for internationalizing
 gem 'rails-i18n', '~> 4.0.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 28b8c64e..1dc442e2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -240,6 +240,7 @@ GEM
     mina (0.3.8)
       open4 (~> 1.3.4)
       rake
+    mini_magick (4.5.1)
     mini_portile2 (2.0.0)
     minitest (5.8.4)
     momentjs-rails (2.8.1)
@@ -545,6 +546,7 @@ DEPENDENCIES
   letter_opener
   letter_opener_web
   mina
+  mini_magick
   money-rails
   mysql2
   omniauth