The company announced the changes via a blog post this afternoon.

Here’s what changes:

If you pay for the “Pro” plan per month, the price will increase from $8 per user per month to $8.75 per user per month. If you pay for the “Pro” plan by the year, the price will increase from $6.67 per user per month to $7.25 per user per month. If you’re on the free plan, they’re changing how messages are stored/lived. Previously, free Slacks showed the last 10,000 messages and 5GB worth of uploads. Moving forward, it will be based on time rather than amount, with Slack showing the last 90 days of messages/uploads regardless of amount or amount sent.

(Prices above are for US users, but will increase globally. Price change chart for other countries available here.) Slack notes that the pricing changes only affect “Pro” plan users, so teams on the Business+ plan (which currently costs $12.50 or $15 per user per month) or custom business plans don’t appear to are affected. Slack says the pricing change — which it says is the “first price increase since [Slack] first released in 2014” — will go into effect on September 1, 2022. The company’s blog post also notes that you can lock in the existing price for an additional year by renewing before September.