So I have an iPhone 6, is there any way of updating my series 4 watch without iOS 13?

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ASC - Late 2012 Mac mini, macOS 10.15.6; Watch, series 5 GPS/cellular, watchOS 7; iPad Air 2, ipadOS 14; iPhone 8+, iOS 14; TV 4th Gen, tvOS 14  HomePods, audioOS 14 and Airport Express w/ Airplay 2

louisfromdurango wrote:

So I have an iPhone 6, is there any way of updating my series 4 watch without iOS 13?

No. And, even if you did update it, it wouldn't work with your iPhone 6 anymore.