Here's when Apple's new watchOS and tvOS updates will be available

Apple just unveiled its latest lineup of iPhones and Apple Watches and, even if you don't plan on upgrading, you'll soon be able to update your existing gadgets.

With the launch of the new products, Apple will also officially release the latest versions of its software, including watchOS 5 and tvOS 12. Both updates will arrive on September 17, alongside iOS 12.

First unveiled in June at WWDC, watchOS 5 adds a suite of new features, including support for podcasts and improved Siri integration (you no longer need to begin queries with "Hey Siri"). The update also makes some web pages viewable directly on your wrist -- a first for the Apple Watch -- and adds a new Walkie-Talkie feature.

The watchOS 5 update will be compatible with the Apple Watch Series 2 and newer models. The original Apple Watch won't be eligible for the update.

With tvOS 12, Apple is also delivering new features to Apple TV owners, even though we have yet to see new hardware. The update brings a new feature called "zero sign-on," which allows streaming apps to automatically detect your cable provider so you won't need to manually sign-in each time.

It also ships with a new screensaver featuring imagery shot by astronauts in the International Space Station.

The tvOS 12 update is compatible with the Apple TV 4K and 4th-generation Apple TV.