diff --git a/Gemfile b/Gemfile
index 91cd7d17d1..4ac3cfdd4a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -75,6 +75,7 @@ gem 'dalli'
 gem 'figaro'
 gem 'geocoder'
 gem 'gmaps4rails'
+gem 'mimemagic', '> 0.3.5'
 gem 'paper_trail', '~> 10.3.1'
 gem 'paperclip', '~> 3.4.1'
 gem 'rack-rewrite'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8eb0e08023..cb61287d8f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -688,6 +688,7 @@ DEPENDENCIES
   kaminari (~> 1.2.1)
   knapsack
   letter_opener (>= 1.4.1)
+  mimemagic (> 0.3.5)
   mini_racer (= 0.4.0)
   monetize (~> 1.11)
   oauth2 (~> 1.4.7)