Hey,
As of React v15.5, it appears that PropTypes has been deprecated and should be accessed through the independent prop-types npm package. I've removed all references to the internal React PropTypes module and replaced with the prop-types package. The warning still seems to persist.

I believe that the issue could lie within another module, not very sure.
https://facebook.github.io/react/warnings/dont-call-proptypes.html
Warning: Accessing PropTypes via the main React package is deprecated. Use the prop-types package from npm instead.