diff --git a/Gemfile.lock b/Gemfile.lock
index 4cc1a45..a83612d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -51,7 +51,7 @@ GEM
       ruby_dep (~> 1.2)
     lumberjack (1.0.12)
     method_source (0.8.2)
-    mini_magick (4.8.0)
+    mini_magick (4.9.4)
     minitest (5.10.3)
     nanoc (4.8.6)
       addressable (~> 2.5)