diff --git a/doc/site/Gemfile.lock b/doc/site/Gemfile.lock
index 20da97b..50d36f5 100644
--- a/doc/site/Gemfile.lock
+++ b/doc/site/Gemfile.lock
@@ -27,7 +27,7 @@ GEM
     oj (1.3.2)
     pygments.rb (0.2.13)
       rubypython (~> 0.5.3)
-    rack (1.4.1)
+    rack (2.0.8)
     rbx-require-relative (0.0.9)
     redcarpet (2.1.1)
     ruby-debug (0.10.4)