diff --git a/Gemfile.lock b/Gemfile.lock
index 049f936..c47749a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -137,7 +137,7 @@ GEM
     pg (0.21.0)
     public_suffix (4.0.1)
     puma (3.12.4)
-    rack (2.2.2)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.7)