The document summarizes the report of the Expert Group on the Standard Minimum Rules for the Treatment of Prisoners at its fourth meeting. The Expert Group was established by the UN General Assembly to continue working towards consensus on revising the Standard Minimum Rules for the Treatment of Prisoners. The Expert Group's report from its fourth meeting will be presented at the Thirteenth UN Congress on Crime Prevention and Criminal Justice to inform discussions on the role of UN standards and norms in supporting effective, fair, and humane criminal justice systems.