A method, system, and/or computer program product propagates system upgrades to peer computers in a peer community. A peer community is defined by identifying peer computers that each have a copy of a same system component. Each of the peer computers in the peer community is autonomous, such that no peer computer controls another peer computer. A test computer is selected from the peer computers. An upgrade to a system component on the test computer is installed and tested. In response to the upgrade to the system component functioning properly within the test computer, a message is sent to other peer computers within the peer community recommending that they install the upgrade.