• Dropped support for Python 3.6, 3.7 and 3.8, requiring Python 3.9 or newer to run PlatformIO Core (issue #5414)
• Removed support for static code analysis via PVS-Studio following its deprecation by the vendor (pull #5360)
• Added a new -p, --port option to the pio run command, allowing users to set both upload_port and monitor_port simultaneously for a more streamlined workflow (pull #5429)
• Added an option to disable the 99-platformio-udev.rules check, providing greater flexibility in environments where system-level udev configuration is not required (pull #5204)
• Introduced the PLATFORMIO_DISABLE_UPGRADE_CHECK environment variable, allowing users to disable upgrade availability checks when needed (pull #5428)
• Upgraded the build engine to the latest version of SCons (4.11.1) to improve build performance, reliability, and compatibility with other tools and systems (release notes)
• Increased the maximum length of dependency version specifications to support long package URLs in project manifests (issue #5459)
• Handled Windows path length limitations during package extraction by raising a descriptive error with instructions to enable long paths when a "FileNotFoundError" occurs (issue #5500)
• Omitted skipped environments and test suites from the Unit Testing summary output when filtering with -e or -f options (issue #5402)
• Fixed an issue that could cause an infinite retry loop when a cached package mirror redirect repeatedly failed (pull #5435)
• Fixed an issue where the library integrity metadata was not invalidated after correcting invalid version requirements (issue #5232)
• Fixed an issue where Unit Testing failed on Windows due to improper handling of Serial.end() (issue #5359)
• Fixed an issue with floating-point precision in duration formatting that caused incorrect millisecond reporting (issue #5424)
• Fixed an issue where the test suite status was incorrectly hardcoded as PASSED (issue #5183)
• Fixed an issue where using a relative path with the -d, --project-dir option caused pio device monitor to fail with a "FileNotFoundError" (pull #5470)
• Fixed compatibility with pipx- and uvx-managed environments by ensuring the required pip dependency is available when installing Python-based tool packages (issue #5305)
• Fixed an issue where debug flags with level specifications (such as -g2) were passed to the standalone assembler, causing fatal compilation errors on .s files (issue #5005)
• Fixed a security vulnerability where ZIP archives containing relative path traversal entries (e.g., ../) could alter permissions or timestamps of files outside the destination directory (pull #5499)
• Fixed an unhandled termios exception when running pio device monitor with redirected or non-TTY stdin, replacing the traceback with a clear user error (pull #5503)
• Fixed an issue with improper static analysis report if project is analyzed in verbose mode (issue #4943)
• Fixed an issue where the test framework library was unintentionally removed from the project dependencies when building a project outside of testing mode (issue #5388)
• Fixed an issue where relative header paths provided via -include build flags were not resolved to absolute paths in c_cpp_properties.json, causing IntelliSense errors (issue #5449)