I just pushed out bleach 1.4.3. The only change between 1.4.2 and
1.4.3 is that 1.4.3 limits the version of html5lib. A version of
html5lib is coming out soon that changes the API that bleach uses, so
bleach won't work with it.
If you're using bleach, you might want to upgrade to 1.4.3 now and
save yourself the heartache later.
http://bleach.readthedocs.io/en/latest/changes.html#version-1-4-3-may-23rd-2016
/will