Shifting from jquery-ui-1.8.2 to jquery-ui-1.11.4. But sortable function not working?

Shifting from jquery-ui-1.8.2 to jquery-ui-1.11.4. But sortable function not working?

With jquery-ui-1.8.2 everything is working fine but when shifted to jquery-ui-1.11.4, sortable function is not working at all? What might be the issue? Please reply.