diff --git a/docs/Gemfile.lock b/docs/Gemfile.lock
index 6cb3dfe..b7426a1 100644
--- a/docs/Gemfile.lock
+++ b/docs/Gemfile.lock
@@ -241,7 +241,7 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.9)
     rouge (3.26.0)
     ruby-enum (0.9.0)
       i18n