diff --git a/Gemfile.lock b/Gemfile.lock
index 02e8d2018..6b2f1e9fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/kjvarga/sitemap_generator.git
-  revision: 89ec319333aaafb2ed12f4a99ce3d664110cfc05
+  revision: 2b4fc4b138e70b675a1eaef62f45d6024f1cb705
   branch: master
   specs:
-    sitemap_generator (6.3.0)
+    sitemap_generator (6.4.0)
       builder (~> 3.0)
 
 GEM