SEBA-420 remove superfluous xproto options

Change-Id: Icc507c7672d79f294594014e177aad82e5105ef0
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 1822753..62f9cc4 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -15,7 +15,7 @@
 # docker build -t xosproject/kubernetes-synchronizer:candidate -f Dockerfile.synchronizer .
 
 # xosproject/kubernetes-synchronizer
-FROM xosproject/xos-synchronizer-base:2.2.5
+FROM xosproject/xos-synchronizer-base:2.2.18
 
 COPY xos/synchronizer /opt/xos/synchronizers/kubernetes
 COPY VERSION /opt/xos/synchronizers/kubernetes/