If you meant the fourth databook for the original Naruto (not Shippuden ), that would be (2005) — but that covers pre-timeskip only. The commonly referenced “Databook 4” among fans is the 2014 Jin no Sho .
: Fans often search for "Naruto x Piece" or "Deep" insights because the two authors discuss their decade-long rivalry and deep mutual respect. naruto databook 4
It solves the problem of flipping back and forth between old databooks to understand just how much stronger the cast became in the final arc, providing a definitive "End of Series" snapshot for each character. If you meant the fourth databook for the