my lightroom has not updated

Hey ​@robinchun, 

It looks like you have a subscription via Adobe and will need to use Creative Cloud to update your Lightroom. It looks like ​@KR Seals shared a link to how to keep your apps updated here. If that helped, please mark let us know by marking it as correct. 

You should be able to do that in the Creative Cloud App. If updates are not showing, click the “Check for Updates” button in the upper right of the app.