Please update my iPhone iOS 14

iOS 13 and abovce required 2GB and more RAM

These are the iOS options based on iPhone Model --> You need to Identify your iPhone model - Apple Support

• iOS 15.6.1 —> 6S / 6S Plus, SE (1st Gen and 2nd Gen), 7 / 7 Plus, 8 / 8 Plus, X, XR, XS /XS Max, 11,11 Pro /11 Pro Max, iPhone 12, 12 Mini, 12 Pro, 12 Pro max, iPhone 13, 13 Mini, 13 Pro, 13 Pro Max
• iOS 12.5.5 —> Final release supported on iPhone 5S, iPhone 6/6 Plus, 

Learn how to--> Update your iPhone, iPad, or iPod touch - Apple Support

Refer to the pic for more...

va ~ Apple offers many newer iPhone models which will run iOS 14:

iOS 14 and iPadOS are compatible with these devices

...found by searching Apple's Knowledge Base.

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If your iPhone supports iOS 14 and you having some issues with updating iOS connect to iTunes and update..it But if your iPhone has low storage or other reasons that iPhone refused to updated

check out this link:-

https://www.mobitrix.com/iphone-support/why-wont-my-iphone-update-ios.html