Update VERSION and XOS parent container

Change-Id: I946f05d42d67e36451c6194ca677447ef28bec61
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 85bd064..a5397fd 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -14,7 +14,7 @@
 
 # xosproject/internetemulator-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.0.0
+FROM xosproject/xos-synchronizer-base:2.1.9
 
 COPY xos/synchronizer /opt/xos/synchronizers/internetemulator
 COPY VERSION /opt/xos/synchronizers/internetemulator/