JR Pass increase

I will be travelling to Japan on the 27th December.

We were planning to buy the 14day JR pass for travel from;
Tokyo> Hakuba>Kyoto>Osaka>Tokyo. With day trips to Hiroshima & Nara from Osaka.

The JR pass came in at better value but I have now read it will be increasing. Does you know if I purchase tickets just before the 1st October to beat the price increase and remain in the 90 day window it will still allow me to travel in Dec/Jan at the lower price? We will be using the JR pass from 28/12/23 - 10/01/24. 90 days from the 1st October is the 30 December so we only just scrape in.