diff --git a/Gemfile.lock b/Gemfile.lock
index f0cf9f6..8de388b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,7 +150,7 @@ GEM
     psych (3.1.0)
     public_suffix (4.0.3)
     puma (3.12.4)
-    rack (2.2.2)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.4.1)