SQL Syntaks fejl

Hvad er fejlen i følgende gemte procedure:

CREATE PROCEDURE dbo.up_parmupd_UserT_CCT
  (@Firstname VarChar(50),
    @Lastname VarChar(50),
    @EmailAddress VarChar(50),
    @Username VarChar(30),
    @Password VarChar(10),
    @CCType VarChar(20),
    @ExpMonth Int,
    @ExpYear Int,
    @CCNumber Uniqueidentifier,
    @Donations Money) AS
UPDATE User_T
JOIN Creditcard_T ON
Creditcard_T.Creditcard_ID = User_T.Creditcard_ID
SET First_Name_VC = @Firstname, Last_Name_VC = @Lastname,
Email_Address_VC = @EmailAddress, User_Name_VC = @Username,
Password_VC = @Password, Creditcard_Type_VC = @CCType,
Creditcard_Exp_Month_IN = ExpMonth,
Creditcard_Exp_Year_IN = @ExpYear,
Creditcard_Number_UI = @CCNumber,
Donations_MN = @Donations
WHERE User_Name_VC = @Username AND
Password_VC = @Password

Jeg får fejlmeddelelsen:

Server: Msg 156, Level 15, State 1, Procedure up_parmupd_UserT_CCT, Line 13
Incorrect syntax near the keyword 'JOIN'.