lastversion 3.5.0 requires cachecontrol<=0.12.11 but you have cachecontrol 0.14.0 which is incompatible, breaks lastversion when upgrading pip packages.

[Dave]

ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
lastversion 3.5.0 requires cachecontrol<=0.12.11, but you have cachecontrol 0.14.0 which is incompatible.

[Danila Vershinin]

lastversion indeed required cachecontrol<=0.12.11. Please install it from packages or in a virtualenv (e.g. via pip-safe)