diff --git a/Gemfile.lock b/Gemfile.lock
index 07c72dd..fea2770 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,7 +126,7 @@ GEM
       pg
     public_suffix (3.0.3)
     puma (3.12.0)
-    rack (2.0.6)
+    rack (2.1.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.6.2)