PlatformIO Open Source February Updates
PlatformIO Core bugfix release, Support for the latest ESP-IDF and Zephyr RTOS, Updates for Espressif32, ST STM32 and mbed-enabled dev-platforms
Welcome to the February 2026 updates of PlatformIO Open Source professional collaborative platform for embedded development.
This month we received a lot of helpful feedback from our community, which let us identify the most important parts of our OSS ecosystem that required our attention, so there are plenty of updates pushed in this month that we hope you will like.
During February, we released a bugfix update for PlatformIO Core, added support for the latest ESP-IDF and Zephyr RTOS, rolled out updates for Espressif32, ST STM32 and other development platforms, fixed a lot of issues. Some of the key highlights include:
- PlatformIO Core 6.1.19
- Zephyr RTOS v4.3
- ESP-IDF v5.5.3
- ST STM32 dev-platform v19.5
- Espressif32 dev-platform v6.13
- Arduino Core for mbed-enabled devices v4.5
PlatformIO Core 6.1.19
PlatformIO Core is the heart of the whole PlatformIO ecosystem and we are excited to announce the next v6.1.19 release with lots of great improvements and bugfixes:
- Added support for Python 3.14
- Upgraded the Doctest testing framework to version 2.4.12, the GoogleTest to version 1.17.0, and the Unity to version 2.6.1, incorporating the latest features and improvements for enhanced testing capabilities
- Enhanced compatibility with the CCLS language server, improving integration with editors like Emacs, Sublime Text, and Vim (issue #5186)
- Improved error messages for package installation to make it easier to understand when a package is missing or incompatible (pull #5336).
- Fixed a regression issue where custom build flags were not properly reflected in the compile_commands.json file, ensuring accurate compilation database generation
- Fixed an issue where fully-qualified serial port URLs (e.g.,
rfc2217://host:port) were incorrectly treated as wildcard patterns (issue #5225) - Fixed an issue where the toolchain path in static analysis was not handled correctly if it contained spaces (pull #5351)
- Fixed installation failure when the executable path contains spaces for
postinstallscripts and handling both list and string command formats (pull #5366) - Fixed cleanup of the
.pio/libdepsfolder so that leftover libraries are properly removed when the lib_deps option is empty (issue #5110)
See Release Notes for more detailed information and use pio upgrade command to update to the latest version.
Zephyr RTOS v4.3
We’re happy to announce updated support for the latest release v4.3.0 of Zephyr Project - a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource-constrained devices, and built with safety and security in mind.
Related resources for Zephyr framework:
- Release notes for v4.3.0
- Documentation for Zephyr framework
- Supported development platforms
- Supported boards
ESP-IDF v5.5.3
We’re happy to announce updated support for the latest release of ESP-IDF v5.5.3 - the official development framework for the ESP32, ESP32-S and ESP32-C Series SoCs. It provides a self-sufficient SDK for any generic application development on these platforms, using programming languages such as C and C++. ESP-IDF currently powers millions of devices in the field, and enables building a variety of network-connected products, ranging from simple light bulbs and toys to big appliances and industrial devices.
Major enhancements in v5.5.3:
- Supported bluedroid host PAwR feature
- Added alignment checks for DMA when flash encryption is enabled
- SPI Master can transfer PSRAM buffers with DMA directly without extra copy
More information on project configuration for ESP-IDF can be found here.
Related resources for ESP-IDF:
ST STM32 dev-platform v19.5
The new release of the ST STM32 dev-platform comes with new boards, latest Zephyr RTOS, updated Arduino cores and several minor improvements:
- Added new boards:
- WeAct Studio STM32G474 CoreBoard
- LilyGo T3-STM32
- Updated Zephyr to v4.3 (release notes)
- Updated STM32 Arduino Core to v2.12.0 (release notes)
- Updated Arduino-mbed core to v4.5.0 (release notes)
- Updated J-Link to v9.2.0 (release notes)
- Enabled CMSIS for Nucleo-H723ZG (#894)
- Minor fixes and improvements
Related resources for the ST STM32 dev-platform:
Espressif32 dev-platform v6.13
The new release of the Espressif 32 dev-platform brings support for the latest ESP-IDF, updated packages and several minor improvements:
- Added support for ESP-IDF v5.5.3 (release notes)
- Updated IDF toolchains to v14.2.0+20251107
- Updated
esptoolpyto v4.11.0 (release notes) - Minor fixes and improvements
Related resources for the Espressif32 dev-platform:
Arduino Core for mbed-enabled devices v4.5
The ST STM32, Nordic nRF52 and Raspberry Pi RP2040 dev-platforms have been updated to support the latest Arduino Core for mbed-enabled devices v4.5.0. According to the release notes, v4.5.0 brings a lot of bugfixes and improvements in the core and accompanying libraries.
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