diff --git a/templates/sinatra_app/Gemfile.lock b/templates/sinatra_app/Gemfile.lock
index eaae45d..26ab82f 100644
--- a/templates/sinatra_app/Gemfile.lock
+++ b/templates/sinatra_app/Gemfile.lock
@@ -44,7 +44,7 @@ GEM
     netrc (0.11.0)
     pg (0.18.4)
     puma (3.4.0)
-    rack (1.6.11)
+    rack (1.6.12)
     rack-protection (1.5.5)
       rack
     rack-test (0.6.3)