VOL-3367 - bump chart versions

Change-Id: I1ddcd04b62d44fda5c381c70a28b4df361155550
diff --git a/voltha/Chart.yaml b/voltha/Chart.yaml
index 6884e1b..670d206 100644
--- a/voltha/Chart.yaml
+++ b/voltha/Chart.yaml
@@ -14,7 +14,7 @@
 ---
 apiVersion: "v1"
 name: "voltha"
-version: "2.5.2"
+version: "2.5.5"
 description: "A Helm chart for Voltha based on K8S resources in Voltha project"
 keywords:
   - "onf"