Update VERSION and XOS parent container

Change-Id: Ic7f9fe661a8191a5c29297876bec642c9a34ac1c
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index d9c1c4e..9de15c9 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,7 +16,7 @@
 
 # xosproject/att-workflow-driver-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.4
+FROM xosproject/xos-synchronizer-base:2.1.12
 
 COPY xos/synchronizer /opt/xos/synchronizers/att-workflow-driver
 COPY VERSION /opt/xos/synchronizers/att-workflow-driver/