Devices / Makers & open firmware / Arduino Development environment

Arduino Development environment firmware

current

Latest firmware: 2.3.10
Released: Jun 9, 2026
Category: Makers & open firmware
Last checked: Sep 14, 2026

How to update the Arduino Development environment

Open the Arduino IDE, then Tools, then Board, then Boards Manager and update the core for your board.
For the UNO R4's connectivity firmware, use the Firmware Updater under Tools.
Keep the board connected by USB throughout.

Always download firmware from the manufacturer or project itself. Firmwarely links out; it never hosts firmware.

What changed

### Changed - Bump Arduino CLI to 1.5.1 (#2920) - Add clean compile/verify (with shift+click on the verify button) (#2923) ### Fixed - In some cases, sketch code is not recompiled (cached) after being modified. - Startup error due to missing CLI directory defaults (#2922)

Manufacturer release notes ↗

Version history

2.3.10

Jun 9, 2026

FAQ

How do I update the Arduino Development environment?

See the step-by-step above. Follow the project's release page for the flashing or OTA procedure. Many maker devices update from a web installer or the project's desktop app.

How does Firmwarely know when there's a new version?

Every night we read the manufacturer's official release page for the Arduino Development environment and record the version, date and changelog. If anything changed, subscribers watching this device get an email.

Is this an official Arduino page?

No. Firmwarely is independent. Device and brand names belong to their manufacturers; always download firmware from the official source.