diff --git a/Gemfile b/Gemfile
index e126bb701..c73b75e10 100644
--- a/Gemfile
+++ b/Gemfile
@@ -64,7 +64,7 @@ gem 'bigbluebutton_rails', git: 'https://github.com/mconf/bigbluebutton_rails.gi
 # for logos + attachments
 gem 'carrierwave', '~> 0.10.0'
 gem 'rmagick', '~> 2.16.0'
-gem 'mini_magick', '~> 3.8.1'
+gem 'mini_magick', '~> 4.9.4'
 
 # global configurations
 gem 'dotenv-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index b0fe83d85..25fbb6a6b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -309,8 +309,7 @@ GEM
       thin (~> 1.5.0)
     method_source (0.8.2)
     mime-types (1.25.1)
-    mini_magick (3.8.1)
-      subexec (~> 0.2.1)
+    mini_magick (4.9.4)
     mini_portile2 (2.0.0)
     minitar (0.5.4)
     minitest (5.8.4)
@@ -534,7 +533,6 @@ GEM
       activesupport (>= 3.0)
       sprockets (>= 2.8, < 4.0)
     sqlite3 (1.3.9)
-    subexec (0.2.3)
     systemu (2.6.4)
     temple (0.6.9)
     terminal-table (1.4.5)
@@ -644,7 +642,7 @@ DEPENDENCIES
   lograge
   logstash-event
   mailcatcher
-  mini_magick (~> 3.8.1)
+  mini_magick (~> 4.9.4)
   momentjs-rails (>= 2.8.1)
   mysql2 (~> 0.3.0)
   net-ldap