This file is a simple placeholder for forcing the appveyor build cache to invalidate itself since appveyor.yml changes more frequently then the cache needs updating. Note, the versions list here can be different than what is indicated in appveyor.yml. To invalidate the cache, update this file and check it into git. Currently used modules built in the cache: OpenSSL Version: 1.0.2o PostgreSQL Version: 10.4 NOTE: to zap the cache manually you can also use: curl -X DELETE -H "Authorization: Bearer $APPVEYOR_TOKEN" -H "Content-Type: application/json" https://ci.appveyor.com/api/projects/psycopg/psycopg2/buildcache with the token from https://ci.appveyor.com/api-token