Hello, Since version 3.11, ZODB3 now depends on persistent, BTrees, ZODB and ZEO. In Debian, there is currently ZODB3 3.9.7 package, named python-zodb. However, python-persistent 4.0.8 has recently been uploaded and of course its contents conflicts with python-zodb 3.9.7 (which also ships "persistent" module). One solution which has been suggested is to remove "persistent" module from python-zodb and make python-zodb (3.9.7) depends upon python-persistent (4.0.8) instead. After running (legacy) Unit Tests of python-zodb "persistent" with python-persistent installed and checking the changes between these versions, I don't think there would be any issue, could anyone confirm? Thank you very much in advance! Cheers, -- Arnaud Fontaine