[SEBA-494] Setting required core version

Change-Id: I5656fef4dadc50b4a072c7783608c1d138eb0ca3
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index ab754d1..14a1465 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:2.1.50
+FROM xosproject/xos-synchronizer-base:2.2.1
 
 COPY xos/synchronizer /opt/xos/synchronizers/fabric
 COPY VERSION /opt/xos/synchronizers/fabric/