diff --git a/doc/.deploy_heroku/Gemfile.lock b/doc/.deploy_heroku/Gemfile.lock
index 25f3e44..93e3096 100644
--- a/doc/.deploy_heroku/Gemfile.lock
+++ b/doc/.deploy_heroku/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rack (1.5.2)
-    rack-protection (1.5.1)
+    rack (1.6.13)
+    rack-protection (1.5.5)
       rack
     sinatra (1.4.4)
       rack (~> 1.4)