# How can i fall back to pyqt6.9.1 version when installed by pypi? **URL:** \ **Category:** Help\ **Created:** [September 14, 2025, 6:05am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456 "2025-09-14T06:05:38Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![aoyama](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@aoyama](https://forums.ankiweb.net/u/aoyama)\ **Post date:** [September 14, 2025, 6:05am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/1 "2025-09-14T06:05:38Z")
Hi, i’m the maintainer of snap anki package. I’ve noticed a blank main window issue with the latest version 25.09, while the previous build, the version 25.07.5 doesn’t have this issue. After comparing, I’ve discovered that this might be due to the PyQt6 being updated to 6.9.2. I’d like to know how to revert to PyQt6 6.9.1. Any help will be appreciated, thank you. ---
**Author:** ![aoyama](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@aoyama](https://forums.ankiweb.net/u/aoyama)\ **Post date:** [September 14, 2025, 6:19am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/2 "2025-09-14T06:19:35Z")
And this issue can be resolved by switching the driver to vulkan or software. Since OpenGL is the default option and most users should be using the default option, so still need fix out. ---
**Author:** ![vaibhav](https://avatars.discourse-cdn.com/v4/letter/v/c68b51/32.png) [@vaibhav](https://forums.ankiweb.net/u/vaibhav)\ **Post date:** [September 14, 2025, 7:17am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/3 "2025-09-14T07:17:16Z")
I am not familiar with how snap packages are built. But, the following might be relevant. > [@Provide an easier way to change PyQt version](https://forums.ankiweb.net/t/provide-an-easier-way-to-change-pyqt-version/64517): > > Due to the issue mentioned in [Anki 25.07/08 Beta 1-2 - #21 by vaibhav](https://forums.ankiweb.net/t/anki-25-07-08-beta-1-2/63645/21) (issue introduced in pyqt-qt6 v6.8.2), I am using the latest Anki release with an older Qt by altering the pyproject.toml file as follows: [project] name = "anki-launcher" version = "1.0.0" description = "UV-based launcher for Anki." requires-python = "\>=3.9" dependencies = ["anki==25.07.3", "aqt==25.07.3", "anki-audio", "pyqt6-qt6==6.8.1", "pyqt6-webengine-qt6==6.8.2"] However, this means that I have to manually… ---
**Author:** ![aoyama](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@aoyama](https://forums.ankiweb.net/u/aoyama)\ **Post date:** [September 14, 2025, 9:59am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/4 "2025-09-14T09:59:00Z")
Thank you for the information! ---
**Author:** ![aoyama](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@aoyama](https://forums.ankiweb.net/u/aoyama)\ **Post date:** [September 14, 2025, 3:24pm UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/5 "2025-09-14T15:24:35Z")
Tried revert to 6.9.1 but the problem persists. Keep getting these error messages. ```auto Starting main loop... Qt warning: Backend texture is not a Vulkan texture. Qt debug: Compositor returned null texture Qt warning: Backend texture is not a Vulkan texture. Qt debug: Compositor returned null texture ``` ---
**Author:** ![abdo](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/abdo/32/654_2.png) [@abdo](https://forums.ankiweb.net/u/abdo)\ **Post date:** [September 15, 2025, 8:04am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/6 "2025-09-15T08:04:42Z")
Have you tried downgrading pyqt6-webengine? ---
**Author:** ![aoyama](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@aoyama](https://forums.ankiweb.net/u/aoyama)\ **Post date:** [September 15, 2025, 10:16am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/7 "2025-09-15T10:16:53Z")
Yes, did. But unfortunately it didn’t work. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\ **Post date:** [October 15, 2025, 10:17am UTC](https://forums.ankiweb.net/t/how-can-i-fall-back-to-pyqt6-9-1-version-when-installed-by-pypi/66456/8 "2025-10-15T10:17:36Z")
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