diff --git a/latest.json b/latest.json
index 40d26f46fe2..b5abed00efa 100644
--- a/latest.json
+++ b/latest.json
@@ -1,4 +1,4 @@
 {
   "stable": "6.3.5",
-  "testing": "6.3.5"
+  "testing": "6.4.0-beta1"
 }