More information is needed.
However, be sure to check that you have enabled any "automatically update" options available.
And here is a link from within this forum that may provide some assistance:
www.tomsguide.com/answers/id-3044894/widevine-content-decryption-module-updating.html
You can also go online and google for more recent problems and solutions regarding widevine.
Especially if you have some specific issues or problems.