SEBA-420 remove superfluous xproto options

Change-Id: I15f22529034a209ec761ef8fed7145e185e9dd47
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index f0f9042..2584e96 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,7 +16,7 @@
 
 # xosproject/fabric-crossconnect-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.2.5
+FROM xosproject/xos-synchronizer-base:2.2.18
 COPY xos/synchronizer /opt/xos/synchronizers/fabric-crossconnect
 COPY VERSION /opt/xos/synchronizers/fabric-crossconnect/