Update salesfoce CLI to latest version

 You can update salesforce cli to latest version with following ways. Open powershell/ bash file then run below command on your choice. 

Update Salesforce CLI with sfdx command

If you have installed salesforce cli using executable file then run following sfdx command to update. 

sfdx update

Update Salesforce CLI with npm command

If you have installed salesforce cli using npm, then you have to update using this command. 

npm update --global sfdx-cli

To update salesforce cli stable version

sfdx update stable