diff --git a/sample_app/Gemfile.lock b/sample_app/Gemfile.lock
index fc6bd39..9b05322 100644
--- a/sample_app/Gemfile.lock
+++ b/sample_app/Gemfile.lock
@@ -334,7 +334,7 @@ GEM
     popper_js (1.12.9)
     powerpack (0.1.2)
     puma (3.11.4)
-    rack (2.0.5)
+    rack (2.0.8)
     rack-protection (2.0.3)
       rack
     rack-test (1.0.0)