SEBA-457 Upgrade to xos-core 2.2.5

Change-Id: Idf31269cf0e4a726d8b0209617418ac277c7a177
diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index fbbd43a..f0f9042 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,7 +16,7 @@
 
 # xosproject/fabric-crossconnect-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.2.1
+FROM xosproject/xos-synchronizer-base:2.2.5
 COPY xos/synchronizer /opt/xos/synchronizers/fabric-crossconnect
 COPY VERSION /opt/xos/synchronizers/fabric-crossconnect/