Invalid yarn dependencies: ajv-keywords has incorrect peer dependency

I attempted to upgrade to yarn 1.0.2:

$ yarn install
yarn install v1.0.2
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
warning "ajv-keywords@2.1.0" has incorrect peer dependency "ajv@>=5.0.0".
warning "ajv-keywords@1.5.1" has incorrect peer dependency "ajv@>=4.10.0".
[4/4] 📃  Building fresh packages...
✨  Done in 4.80s.

/cc: @jschatz1, @mikegreiling