diff --git a/Gemfile.lock b/Gemfile.lock
index 2899fa5..309a4ce 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,7 @@ GEM
       activerecord (>= 3.0)
     public_suffix (3.0.2)
     puma (3.11.3)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-test (0.8.3)
       rack (>= 1.0, < 3)
     rails (5.1.5)