diff --git a/Gemfile.lock b/Gemfile.lock
index b7ac083..617805b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ GEM
     pg (0.21.0)
     public_suffix (3.0.0)
     puma (3.10.0)
-    rack (2.0.3)
+    rack (2.2.3)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
     rails (5.1.4)