How can we change the jar file from one version to another? selenium

I want to change the selenium java jar file. I deleted the one old and insert a new one however it is still saying it cannot find the old one.

I have changed in update-config.json file inC:\npm\node_modules\protractor\node_modules\webdriver-manager\selenium folder but it still not working.

I want to know where this jar is referenced when doing selenium testing.

Error: Unable to access jarfile C:\npm\node_modules\protractor\node_modules\webdriver-manager\selenium\selenium-server-standalone-3.4.0.jar

From selenium-server-standalone-3.4.0.jar to selenium-server-standalone-2.51.1.jar