Apple Watch not updating vo2max

I know Apple Watch only measures vo2max by doing outdoor walks/runs. I have been using the number to roughly track my progress of running. It has worked fine for the past 2 months and after I finish my runs I can go in and see all the information. The past 3 days I have went on outdoor runs and all the information shows up on the health app except the Vo2max’s. The last vo2max it shows is from my run 4 days ago. Does anyone know how to fix this? (Apple Watch series 5 on version 10.5) Thanks!