Latest voltha helm-chart for voltha-2.5

Change-Id: Ibc1654a6961b7bd06bf1a0cfea6bd601c656b5e8
diff --git a/releases/voltha-2.5 b/releases/voltha-2.5
index 3006a2f..e2327de 100644
--- a/releases/voltha-2.5
+++ b/releases/voltha-2.5
@@ -3,7 +3,7 @@
 #
 # Source this file before running ./voltha up to install the VOLTHA 2.5.0 release
 
-export VOLTHA_CHART_VERSION=2.6.3
+export VOLTHA_CHART_VERSION=2.6.4
 export VOLTHA_BBSIM_CHART_VERSION=4.0.1
 export VOLTHA_ADAPTER_OPEN_OLT_CHART_VERSION=2.6.4
 export VOLTHA_ADAPTER_OPEN_ONU_CHART_VERSION=2.5.0