Update VERSION and XOS parent container

Change-Id: I03cdfa946102ee8e7e974e2ac6f717994ed5ecf9
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 615ceb6..a3786ae 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -15,7 +15,7 @@
 # docker build -t xosproject/fabric-synchronizer:candidate -f Dockerfile.synchronizer .
 
 # xosproject/fabric-synchronizer
-FROM xosproject/xos-synchronizer-base:2.1.4
+FROM xosproject/xos-synchronizer-base:2.1.12
 
 COPY xos/synchronizer /opt/xos/synchronizers/fabric
 COPY VERSION /opt/xos/synchronizers/fabric/