diff --git a/Gemfile.lock b/Gemfile.lock
index 8fc0de8..1c80154 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mini_magick (4.8.0)
+    mini_magick (4.9.4)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.1)