diff --git a/Gemfile.lock b/Gemfile.lock
index 0403eb0..5dc3e94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
       racc (~> 1.4)
     public_suffix (3.0.3)
     racc (1.6.0)
-    rack (2.0.7)
+    rack (2.2.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)