Hi I guess your dynamo version in 21 is shipped with your revit version and should be 2.12 if i remember right
PS I dont remember right 
take look here on this post here…Dynamo Revit versioning question - #7 by sovitek
Hi I guess your dynamo version in 21 is shipped with your revit version and should be 2.12 if i remember right
PS I dont remember right take look here on this post here…Dynamo Revit versioning question - #7 by sovitek