diff --git a/Gemfile.lock b/Gemfile.lock
index 2b2c6d6..a086180 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -190,7 +190,7 @@ GEM
     plist (3.5.0)
     public_suffix (2.0.5)
     puma (3.12.1)
-    rack (2.0.7)
+    rack (2.2.8.1)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (5.0.7.2)