# TB4.1 and AlignRT version

**URL:** <https://forum.sgrt.org/t/tb4-1-and-alignrt-version/242>\
**Category:** General\
**Created:** [September 22, 2024, 8:56pm UTC](https://forum.sgrt.org/t/tb4-1-and-alignrt-version/242 "2024-09-22T20:56:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![moosepad](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@moosepad](https://forum.sgrt.org/u/moosepad)\
**Post date:** [September 22, 2024, 8:56pm UTC](https://forum.sgrt.org/t/tb4-1-and-alignrt-version/242/1 "2024-09-22T20:56:22Z")

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Heads up to TrueBeam users, if you are upgrading to TB4.1 version, we just found out that AlignRT software version needs to be minimum 6.3.243 so if you are still on .235, it won’t work. We opened a service ticket and waiting for a call. Anyone else experienced this problem?