The dependency graph of the requirements is as follows:

dev +-> prod +-> common
+
|
v
mypy,docs,pip

Of the files, only dev, prod, and mypy have been used in the install scripts directly. The rest are implicit dependencies.

Steps to update a lock file, e.g. to update ipython from 5.3.0 to latest version: 0. Remove entry for ipython==5.4.1 in dev.txt.

1. Run ./tools/update-locked-requirements, which will generate new entries, pinned to the latest version.
2. Increase PROVISION_VERSION in version.py.
3. Run ./tools/provision to install the new deps and test them.
4. Commit your changes.