diff --git a/Gemfile.lock b/Gemfile.lock
index bd101aa..d292eda 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -65,7 +65,7 @@ GEM
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     mercenary (0.3.5)
-    mini_magick (4.0.2)
+    mini_magick (4.9.4)
     mini_portile (0.6.2)
     multi_json (1.10.1)
     nokogiri (1.6.6.2)