diff --git a/Gemfile.lock b/Gemfile.lock
index 123d437..f603d21 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -145,7 +145,7 @@ GEM
     public_suffix (4.0.1)
     puma (4.3.8)
       nio4r (~> 2.0)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.4)