MS SQL Query not updating

I think I need a fresh set of eyes here. I wrote a select statement just to make sure I was retrieving the correct records. I then converted it to an update statement. What I am trying to accomplish is to set the CategoryID based on the Category Name. After running the Update statement I would expect the Select statement to no longer return any records because now all the Category ID's are the same. However, it keeps returning the same records. What have I overlooked?

---- Select statement
select rbs.ItemNumber,rbs.CategoryID,nodx.CategoryID,rbs.CategoryName,nodc.Name,nodc.id
from rbsProductsByCategory rbs
inner join [NodusesSS]..[bvc_ProductXCategory] nodx on rbs.ItemNumber=nodx.ProductID
inner join [NodusesSS]..[bvc_Category] nodc on rbs.CategoryName= nodc.Name
where nodc.id<>rbs.CategoryID

---- Update Statement
update rbsProductsByCategory 
set CategoryID=nodc.id
from rbsProductsByCategory rbs
inner join [NodusesSS]..[bvc_ProductXCategory] nodx on rbs.ItemNumber=nodx.ProductID
inner join [NodusesSS]..[bvc_Category] nodc on rbs.CategoryName= nodc.Name
where nodc.id<>rbs.CategoryID

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