diff --git a/Gemfile.lock b/Gemfile.lock
index b78908c..5b73645 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
     padrino-support (0.12.4)
       activesupport (>= 3.1)
     puma (3.12.2)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-livereload (0.3.15)
       rack
     rack-test (0.6.2)