On any windows machine with Citrix installed you can locate your Citrix icon near your clock. .
Right click on the icon and select Advanced Preferences.
Select Citrix Updates
Once that is selected, you will need to right click on your Citrix icon (like you were going to select Advanced Properties above), and select Exit.
Open your Citrix Workspace again and it should start looking for an update.
If one is available, you can hit install/ok/apply and allow it to upgrade.
If you have issues with the above you can manually update for windows here:
Macs have auto update enabled by default and should update you.
You can manually download this here: