my macbook air( 13 inc - 2014) Version 10.10 and i need too update it ... but there is no updates on my laptop

Please read technical specification for macOS high Sierra

https://support.apple.com/kb/sp765?locale=en_US

Software update may not be available for the macOS installed on your Mac.

Consider upgrading to a later version if compatible with your system.

How to get old versions of macOS

https://support.apple.com/en-us/HT211683

Upgrade: A major new version, often with new system requirements. Each macOS upgrade has a unique name, such as macOS Big Sur.

 Learn more about installing the latest macOS upgrade. Some old versions of macOS are also available.

Published Date: June 11, 2021

    https://support.apple.com/en-us/HT201541