I’ve given an out of date “How to Rent” Guide to my tenants! What about a Section 21?

Rookie mistake.... I managed to attach an out of date version of the government “How to Rent” Guide when putting together the tenancy pack for my new tenants a few months ago. I only just realised my error.
I am anticipating needing to use a Section 21 towards the end of the fixed term, to ensure they leave at the end. Will I now be unable to do so? Any point issuing the correct, current version at this point?
There is another 7 months of the fixed term to run.