diff --git a/Gemfile.lock b/Gemfile.lock
index 9e74d478..a23f6662 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -101,7 +101,7 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_magick (4.8.0)
+    mini_magick (4.9.4)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     nokogiri (1.8.4)