[SEBA-494] Setting required core version

Change-Id: Ie37a9257b10e9fac3624409090feffec39d8865b
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index 1ad33d5..fbbd43a 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,8 +16,7 @@
 
 # xosproject/fabric-crossconnect-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.50
-
+FROM xosproject/xos-synchronizer-base:2.2.1
 COPY xos/synchronizer /opt/xos/synchronizers/fabric-crossconnect
 COPY VERSION /opt/xos/synchronizers/fabric-crossconnect/