diff --git a/Gemfile.lock b/Gemfile.lock
index 42854c2..bb97a07 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,7 +31,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (2.0.3)
+    rack (2.1.4)
     rack-protection (2.0.0)
       rack
     rake (12.0.0)