diff --git a/Gemfile.lock b/Gemfile.lock
index 25d72bc..c8fe108 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     puma (3.4.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rmagick (2.15.4)