diff --git a/Gemfile b/Gemfile
index 7198bdf7..7c1eb7f1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,6 +27,7 @@ gem 'paper_trail'
 # for upload management
 gem 'carrierwave'
 gem 'carrierwave-bombshelter'
+gem 'mimemagic'
 gem 'mini_magick'
 
 # for internationalizing
diff --git a/Gemfile.lock b/Gemfile.lock
index 07de77a8..10c6a0bf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -766,7 +766,6 @@ DEPENDENCIES
   recaptcha
   redcarpet
   responders (~> 2.0)
-  rexml (~> 3.2)
   rolify
   rqrcode
   rspec-activemodel-mocks