diff --git a/Gemfile b/Gemfile
index f0f43718..1f0d1c46 100644
--- a/Gemfile
+++ b/Gemfile
@@ -36,7 +36,7 @@ gem 'js-routes'
 gem 'kaminari'
 gem 'less-rails', '~> 2.7.0'
 gem 'message_bus'
-gem 'mimemagic', github: 'mimemagicrb/mimemagic', ref: 'd5ebc0cd846dcc68142622c76ad71d021768b7c2' # this is v0.3.3
+gem 'mimemagic', git: 'https://github.com/mimemagicrb/mimemagic.git', ref: 'd5ebc0cd846dcc68142622c76ad71d021768b7c2' # this is v0.3.3
 gem 'mysql2'
 gem 'neat', '~> 1.7.1'
 gem 'nokogiri'
diff --git a/Gemfile.lock b/Gemfile.lock
index 57c553cd..5c162bc0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GIT
-  remote: git://github.com/mimemagicrb/mimemagic.git
+  remote: https://github.com/mimemagicrb/mimemagic.git
   revision: d5ebc0cd846dcc68142622c76ad71d021768b7c2
   ref: d5ebc0cd846dcc68142622c76ad71d021768b7c2
   specs: