How to update two join tables?

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SQL-Server

SQL-Server-2008

I intend to write a procedure in SqlServer that can update the joined tables,in my case i have two tables (HowzeEducation & HowzeDegree) so i have written the following query but it has errors and does not work properly.Here is my code:

declare  
@HowzeEducationId int, 
@DegreeId int, 
@FieldName nvarchar(50), 
@FinishLevelDate date, 
@Average decimal(4,2), 
@SchoolName nvarchar(50), 
@StudyCityDescribtion nvarchar(100), 
@ThesisTitle nvarchar(200), 
@Describtion nvarchar(600) 
 
 
update ( 
  select he.FieldName, 
     he.Average, 
     he.Describtion, 
     he.FinishLevelDate, 
     he.SchoolName, 
     he.StudyCityDescribtion, 
     he.ThesisTitle, 
     hd.DegreeId 
from HowzeEducation he inner join HowzeDegree hd on  
     he.HowzeEducationId=hd.HowzeEducationId 
   ) 
 set he.FieldName=@FieldName , 
he.Average=@Average, 
he.Describtion=@Describtion, 
he.FinishLevelDate=@FinishLevelDate, 
he.SchoolName=@SchoolName, 
he.StudyCityDescribtion=@StudyCityDescribtion, 
he.ThesisTitle=@ThesisTitle, 
hd.DegreeId=@DegreeId 
 
where he.HowzeEducationId=@HowzeEducationId

How can solve this problem?