Various systems, processes, and products may be used to update virtual machines. In particular implementations, a system, process, and product for updating virtual machines may include the ability to determine whether a change to a portion of an operating system for a virtual machine is available and identify a virtual machine using the operating system. The system, process, and product may also include the ability to determine when the virtual machine is modifiable and update the portion of the operating system for the virtual machine when it is modifiable.