It is important to establish good patch management practices.

You might need to alter your existing patch management process based on the type of assignment you use:

Type of Assignment Patch Management Process
Traditional-clone, dedicated (persistent) desktops You must push out application updates to each VM as you would to a physical desktop or use a third-party utility and also patch the image itself.
Instant-clone, dedicated (persistent) desktops Because these assignments do not retain changes between sessions, image patching and application updates are straightforward. Patch the image, and then refresh the assignment by pushing or reassigning the image. To patch or update an application installed on the image, update the application inside the image and then push or assign the image.
Traditional-clone and instant-clone, floating (non-persistent) desktops These desktops do not retain changes between sessions, so image patching and application updates are straightforward. Patch the image, and then refresh the assignment by pushing or reassigning the image. To patch or update an application installed on the image, update the application inside the image and then push or assign the image.
Traditional-clone, session (shared) desktops and remote applications Update by patching the image, and then refresh the assignment by pushing the image. To patch or update an application install on the image, update the application inside the image and then push the image.