diff --git a/2019/s1/s1c2/sinatra/Gemfile.lock b/2019/s1/s1c2/sinatra/Gemfile.lock
index a4e0bff..07fc8d1 100644
--- a/2019/s1/s1c2/sinatra/Gemfile.lock
+++ b/2019/s1/s1c2/sinatra/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     multi_json (1.13.1)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-protection (1.5.5)
       rack
     sinatra (1.4.8)