T-Mobile has officially announced the rollout of the Android 6.0 Marshmallow software update to users of the Samsung Galaxy S5 on its network.

The carrier is the second of the big four U.S. networks to release the Android 6.0 Marshmallow update to the device, leaving Verizon and AT&T to follow.

"Beginning May 23, the Samsung Galaxy S5 will have a software update to Android version 6.0.1/ Baseband G900T3UVU1GPE1 OR G900TUVU1GPE1 via Wi-Fi or Samsung Smart Switch for PC. This update provides new features," states T-Mobile.

Users of the 2-year-old former Samsung flagship can access the update manually by visiting their settings menu, or wait for the update to roll out OTA.

At the end of March, Samsung began rolling out the Android 6.0 Marshmallow update to the international version of the Galaxy S5, and Sprint soon followed with the upgrade for its customers.

Sprint also released Android 6.0 Marshmallow for the Galaxy S5 Sport, the more rugged version of the handset that closely mirrors the specs and design details of the Samsung Galaxy S5 Active, which is exclusive to AT&T.

It looks like once again, AT&T is bringing up the rear in getting the Android 6.0 Marshmallow update to its customers, along with Verizon, which has also yet to release the software upgrade.

There's no word on when Verizon and AT&T will release their versions of the Android 6.0 Marshmallow update to the Galaxy S5. AT&T in particular has been late to the party in terms of Marshmallow upgrades recently, having just released the software to the Galaxy S6 and S6 edge well after its competitors did so.

We'll keep you updated on any details regarding the Android 6.0 Marshmallow update for the Samsung Galaxy S5 on Verizon and AT&T.