diff --git a/Gemfile b/Gemfile
index ac54190ab..04e648d6e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -69,7 +69,7 @@ gem 'foreigner',           '1.6.1'
 
 gem 'carrierwave', '0.10.0'
 gem 'fog',         '1.25.0'
-gem 'mini_magick', '3.8.1'
+gem 'mini_magick', '4.0.1'
 gem 'remotipart',  '1.2.1'
 
 # GUID generation
diff --git a/Gemfile.lock b/Gemfile.lock
index 85fc83fd9..3e6e3e66e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -321,8 +321,7 @@ GEM
     messagebus_ruby_api (1.0.3)
     method_source (0.8.2)
     mime-types (2.4.3)
-    mini_magick (3.8.1)
-      subexec (~> 0.2.1)
+    mini_magick (4.0.1)
     mini_portile (0.6.1)
     minitest (5.4.3)
     mobile-fu (1.3.1)
@@ -549,7 +548,6 @@ GEM
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       sprockets (>= 2.8, < 4.0)
-    subexec (0.2.3)
     systemu (2.6.4)
     test_after_commit (0.4.0)
       activerecord (>= 3.2)
@@ -643,7 +641,7 @@ DEPENDENCIES
   json (= 1.8.1)
   markerb (= 1.0.2)
   messagebus_ruby_api (= 1.0.3)
-  mini_magick (= 3.8.1)
+  mini_magick (= 4.0.1)
   mobile-fu (= 1.3.1)
   mysql2 (= 0.3.17)
   nokogiri (= 1.6.4.1)