Chromecast firmware versions and release notes

Here are the latest firmware versions and release notes for Chromecast devices.

Firmware updates are done in stages; the production firmware versions listed here are updated once that version is available to all devices.

Release notes

Chromecast with Google TV 
Build Number: 210311.008 7350836
Security Update: 8 June 2021
Published: 10 June 2021

This software update includes:

• Support for Stadia
• Additional improvements to Bluetooth latency, allowing for better performance for both Bluetooth speakers and headphones.
• Updates and bug fixes to help maintain advanced video settings after device reboots rather than reverting back to factory settings. 
• Updates and improvements to HDMI-CEC issues to improve video quality and reliability. 
• Additional bug fixes and performance improvements.

Previous release notes

Chromecast with Google TV
Build Number: 210311.005
Security Update: 5 April 2021
Published: 20 April 2021

This software update includes:

• Advanced video controls setting for granular HDR formats, resolution/refresh rate and colour formats
  • Advanced video controls can be adjusted via Settings  Display and sound.
• HDMI hotplug improvements to better detect TV's capabilities
• Wi-Fi improvements for 5 GHz and mesh networks
• Bluetooth audio stuttering improvements
• HDMI-CEC can now be configured to turn only the TV on/off in settings
• Security update: Android security patch level to April 2021
• Chromecast remote firmware update to 24.7
• Additional bug fixes and performance improvements

Chromecast with Google TV
Build number: 200918.033
Security update: 5 December 2020
Published: 8 February 2021

This software update includes:

• Improved 4K support for TVs and AVRs
• Dolby Audio improvements for Dolby Atmos and Dolby Digital Plus passthrough content
• Android recovery screen improvements and fixes
  • Reduced the occurrence of users seeing the Android recovery screen
  • Improved instructions when the Android recovery screen is shown 
• Security update: security patch level increased on 5 December 2020
• General security, stability and performance improvements

Current Preview Program firmware version 

Chromecast (1st gen)  –  Firmware version 1.36.159268​

Chromecast (2nd gen) – Firmware version 1.49.250946

Chromecast – Firmware version 1.49.250946

Chromecast Ultra – Firmware version 1.50.250947

Chromecast Audio – Firmware version 1.42.172094

Want to test drive the latest firmware version before it's broadly released? Join the Chromecast Preview Program. 

Current production firmware version

Chromecast (1st gen)  –  Firmware version 1.36.157768

Chromecast (2nd gen) – Firmware version 1.49.250946

Chromecast – Firmware version 1.49.250946

Chromecast Ultra – Firmware version 1.50.250947

Chromecast Audio – Firmware version 1.42.172094

Cast for Android TV – Firmware version 1.42.179832

How to check your firmware version

To check which firmware version you're on:

1. Open the Google Home app .
2. Tap your device  Settings   Device information.
3. Under 'Technical information', check for Cast firmware: X.XXX.XXXXX.