HTC One M9 owners, grab your phone and fire it up, because it’s time to update.

TmoNews reader Evan pinged me today to say that his HTC One M9 is getting a 532.26MB update to version 2.11.531.19. The changelog included with the update only mentions “Android Security Patches,” and T-Mobile’s One M9 support page makes no mention of this new update.

So what’s included? HTC’s Mo Versi said earlier this month that a T-Mobile One M9 update with a Stagefright patch, Android for Work, and “HTC fixes” was targeted for mid-September. Several days later, he said that HTC was targeting September 29 as the rollout date for the T-Mobile One M9’s Stagefright patch. Given all of that, it seems likely that this update includes a Stagefright patch and the other changes that Versi previously mentioned.

If you’ve got a One M9, head into Settings > About > Software updates and see if anything shows up.

Thanks, Evan!