diff --git a/Gemfile.lock b/Gemfile.lock
index c065a99..43a823a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rack (2.0.8)
+    rack (2.1.4)
 
 PLATFORMS
   ruby