@Resnick joy - Please go to Backend -> Extend - > Extensions ...
Then you will see a list of "Core extensions". Look within the "Core extensions" and you will see a table of data under the "Options" collumn please click the small arrow icon that points upwards.. This will automatically update the CKEditor for you.
If you have any issues, Please screen shot the error message and also the page i have asked you to naviate to.