diff --git a/rails_4_test_app/Gemfile.lock b/rails_4_test_app/Gemfile.lock
index 280816f..4dd7be9 100644
--- a/rails_4_test_app/Gemfile.lock
+++ b/rails_4_test_app/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     puma (3.12.1)
-    rack (2.0.7)
+    rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.3)