XOOPS 2.6.0 is not actively developed at the moment.
But in case somebody would like to put some effort into it, it has been updated to PHP 8.4 as the minimum PHP version.

What's Changed

• Fixes by @geekwright in #471
• Stash to 0.14.1 by @geekwright in #472
• Cleanup by @geekwright in #473
• Two small fixes by @geekwright in #478
• Tweaking DtypeMoney by @geekwright in #476
• Codex cleanup pass by @geekwright in #480
• Cleanup static issues in Xoops\Core\Database by @geekwright in #481
• Several small cleanups by @geekwright in #482
• Switch to bootstrap 3.3.6 by @geekwright in #483
• Add/Update some Test Files + fix bugs by @geekwright in #485
• Fix and remove keyName_link by @geekwright in #487
• Updates and fixes by @geekwright in #489
• Cleaning Up by @geekwright in #491
• Fix filename check in Xmf\Language::loadFile() by @geekwright in #494
• Some css adjustments by @angelorocha in #496
• Add testing against PHP 7.1 by @geekwright in #497
• Sync XMF by @geekwright in #498
• Template updates and small fixes by @geekwright in #500
• Legacy support fixes by @geekwright in #499
• PHP 7.1.0 alpha 3 by @geekwright in #501
• XOOPS/xmf issue 13 by @geekwright in #503
• Xoops\Form\DateTime updates by @geekwright in #502
• Testing .travis.yml by @geekwright in #505
• Test Fixes by @geekwright in #506
• Add Xmf\StopWords class by @geekwright in #507
• Error in install by @geekwright in #509
• Issue with Xmf\Yaml::readWrapped() by @geekwright in #510
• Admin : Show links to preferences only if module has preferences. by @trabisdementia in #513
• Font-Awesome by @geekwright in #514
• System module Help by @trabisdementia in #516
• Plugins module by @trabisdementia in #515
• Some cleaning for the plugins module by @trabisdementia in #517
• Adding Xmf/Assert by @geekwright in #520
• Improve Smarty Delimiter issue by @geekwright in #522
• Undefined index when using legacy logger by @trabisdementia in #523
• Adding shortcode compiler (a suggestion) by @trabisdementia in #519
• Plugins module by @trabisdementia in #525
• Adding Waiting Module for Xoops 2.6 by @trabisdementia in #526
• Some improvements for the Waiting module by @trabisdementia in #527
• Core plugins by @trabisdementia in #529
• Adding plugins for the waiting module. by @trabisdementia in #531
• Exception during session_regenerate_id by @geekwright in #532
• Add fontawesome asset by @geekwright in #533
• Changing package information by @trabisdementia in #534
• Adding usermenu module by @trabisdementia in #535
• Fix Typo by @trabisdementia in #538
• Mainmenu by @trabisdementia in #539
• Fixes to value attribute rendering by @geekwright in #537
• Use FixedGroup constants by @geekwright in #541
• Sync changes to XoopsObjectTree made in 2.5.9 by @geekwright in #542
• Fix issues with Xmf\Request::MASK_ALLOW_HTML by @geekwright in #546
• Use Unicode character properties, not ASCII ranges by @geekwright in #548
• Missing option to permission check by @geekwright in #549
• Issues in Xmf\Highlighter, Xmf\Metagen by @geekwright in #550
• Activating Open Collective by @xdamman in #551
• Xmf Update by @geekwright in #554
• Fixed Directory Traversal issue on jquery.php. by @harupu in #557
• Library updates by @geekwright in #558
• Use SQLite driver for Stash if available by @geekwright in #562
• Switching to PHP 7 and Phpunit 6.5 by @geekwright in #561
• Allow usage of placeholders and other goodies on translations by @trabisdementia in #536
• Feature/help tpl by @mambax7 in #555
• Move to more sensible project structure - step 1 by @geekwright in #563
• Move to more sensible project structure - step 2 by @geekwright in #564
• Changes for Library Updates by @geekwright in #565
• Fix coverage errors by @geekwright in #570
• Remove tinymce 3 by @geekwright in #571
• Update to TinyMCE 4.7.6 by @geekwright in #572
• Sync with Xmf changes by @geekwright in #573
• Adding UserMessage service by @geekwright in #575
• Match changes in XOOPS\xmf by @geekwright in #574
• protector templates by @mambax7 in #566
• Assignment in Condition by @mambax7 in #576
• Resync Xmf by @geekwright in #577
• Email Service Provider by @geekwright in #578
• MessageFormatter updates by @geekwright in #579
• Tweak travis.yml and test errors by @geekwright in #582
• Update20190331 by @geekwright in #584
• Jquery update by @GregMage in #585
• Fixes for travis-ci by @geekwright in #586
• Remove bootstrap2 by @GregMage in #587
• Formrender by @GregMage in #588
• Fix test breaks related to form changes by @geekwright in #590
• Text Sanitizer Extension Button Update by @geekwright in #591
• Fix provider preference read by @geekwright in #593
• Automatic autoload for modules by @geekwright in #594
• handling noInfo like Gravatars by @alain91 in #595
• feat(codex): German and Polish translation by @mambax7 in #581
• translation fix by @mambax7 in #597
• Minor fixes by @geekwright in #596
• Feature/publisher namespaces by @mambax7 in #598
• Remove collapse class from nested comments by @geekwright in #601
• Bring ObjectTree into Xoops\Core by @geekwright in #600
• Publisher shakedown by @geekwright in #599
• Console command additions by @geekwright in #602
• Remove ComposerUtility class by @geekwright in #603
• add class 'form-control' by @GregMage in #604
• Handle Symfony style deprecation by @geekwright in #605
• Update to doctrine/dbal 2.9 by @geekwright in #606
• Fix XOOPS news URL by @geekwright in #608
• Fix composer.json.dist by @geekwright in #607
• Fix regression in XoopsModule::loadInfoAsVar() by @geekwright in #609
• Update schema generation by @geekwright in #610
• Cleanup clearCache() messages by @geekwright in https://github.com/XOOPS/...