Update VERSION and XOS parent container

Change-Id: Ifac90bca8a9d6f96a292907db741134e6e5dfa72
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 04d83f8..402ea7f 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -14,7 +14,7 @@
 
 # xosproject/exampleservice-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.0.0
+FROM xosproject/xos-synchronizer-base:2.1.9
 
 COPY xos/synchronizer /opt/xos/synchronizers/exampleservice
 COPY VERSION /opt/xos/synchronizers/exampleservice/