Google launched the first generation Chromecast in 2013. Security updates are still provided. As Google has confirmed to 9To5Google, this original Chromecast will not get any new features. If you have an old one, you may need to upgrade.
It's easy to see if you have a first generation Chromecast. You can either view the Chromecast hardware itself or visit the Google Home app on your smartphone.
Check the generation of your Chromecast by viewing it.
If You Can not Remember, Take a Look Behind the Scenes Check your TV connected to the HDMI port on your TV.
The first generation Chromecast was more of a rounded-end stick, while the second-generation Chromecast and later made a complete circle.
The Chromecast on the left is a first-generation Chromecast. If your Chromecast looks like the left and right Chromecast, you'll get an older Chromecast with only security updates and no new features.
Find the version of your Chromecast from your phone.
You can also verify this from the Google Home app on your mobile device. Make sure your phone or tablet is connected to the same Wi-Fi network your Chromecast uses, and then open the Google Home app for Android, iPhone, or iPad.
Tap the Chromecast whose version you're looking for. 
Tap the gear-shaped adjustment icon in the upper right corner of the screen.
Scroll to the bottom of the screen and look at the "Cast Firmware Version". Number at the bottom of the screen.
If it's 1.36, use a first-generation Chromecast. Starting with version 1.40, you're using a second-generation or newer Chromecast. You can check the latest firmware versions for each Chromecast on the Chromecast Firmware Versions web page.
Should you upgrade your old Chromecast?
If you're using a first-generation Chromecast, upgrading may be a good idea. New Chromecasts not only get new software features, but also improved hardware.
For example, the first generation Chromecast is only compatible with 2.4GHz Wi-Fi networks, while all other Chromecasts are compatible with both 2.4GHz and 2.4GHz networks. 5GHz Wi -Fi networks. Second generation Chromecast has also added support for 802.11ac Wi-Fi. The Chromecast Ultra models offer 4K support and are the only Chromecasts compatible with Google's upcoming Stadia streaming service. The third-generation Chromecast does not support 4K resolution, but can play 1080p video at up to 60 FPS (frames per second). First and second generation Chromecasts only support playing 1080p videos at 30 FPS.
They are cheap too. The original first generation Chromecast was launched in 2013 for $ 35. The third-generation Chromecast continues to be available for $ 35. If you want a Chromecast Ultra, it costs $ 59 instead.
But do you really need to upgrade? Not necessarily. If you're happy with your Chromecast and it works for you, there's probably no security risk. You still get security updates. Google informed 9To5Mac that the company would "continue with bug fixes and security fixes". However, do not expect to get features like speaker groups without buying new hardware in the future.