My rank increased without even playing

[Yellowkind]

Hello. I used to be 12 kyu, now i am 7 kyu without even playing any ranked game.
Did something change with the rating system? The rank graph on my profile shows different numbers than it used to the last time i checked.

Can someone please explain?

Thanks

[teapoweredrobot]

Rating system and ranks were updated earlier this year.

2021 Rating and rank adjustments

tl;dr - Expect a notable bump in your rank. The lower the rank you are, the larger the increase. This transition is planned to take effect around 2021-01-28T01:30:00Z (UTC) . Summary of the update: We are attempting to align our low dan ranks to be comparable to the EGF and AGA low dan ranks. Currently we are projecting that a 1d OGS rank will be about .7 stones weaker than an EGF 1d and about 0.8 stones stronger than an AGA 1d. These numbers will be re-evaluated once the dust settles, but…