diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 88e929b19..8e7a75c48 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
     parslet (2.0.0)
     public_suffix (4.0.7)
     racc (1.6.2)
-    rack (2.2.6.4)
+    rack (2.2.9)
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)