Can't, impossible to update MMR ever since the medal update. Dotabuff only knew your MMR because you displayed it on your profile, but you can't do that ever since they introduced medals.
the only way is to have your solo mmr displayed on your profile in-game before the patch, if you didn't have it enabled before they removed it you can't update it
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how do i update my current mmr? i have 5170 and dotabuff shows i have 5067.