diff --git a/templates/sinatra_app/Gemfile.lock b/templates/sinatra_app/Gemfile.lock
index eaae45d..f445a24 100644
--- a/templates/sinatra_app/Gemfile.lock
+++ b/templates/sinatra_app/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     multi_json (1.12.1)
     netrc (0.11.0)
     pg (0.18.4)
-    puma (3.4.0)
+    puma (3.12.4)
     rack (1.6.11)
     rack-protection (1.5.5)
       rack