- Fix a bug introduced in Synapse 1.54.0rc1 preventing the new module callbacks introduced in this release from being registered by modules. ([\#12141](https://github.com/matrix-org/synapse/issues/12141))
- Fix a bug introduced in Synapse 1.54.0rc1 which meant that Synapse would refuse to start if pre-release versions of dependencies were installed. ([\#12177](https://github.com/matrix-org/synapse/issues/12177))
- Fix a bug introduced in Synapse 1.54.0rc1 where runtime dependency version checks would mistakenly check development dependencies if they were present and would not accept pre-release versions of dependencies. ([\#12129](https://github.com/matrix-org/synapse/issues/12129), [\#12177](https://github.com/matrix-org/synapse/issues/12177))
Internal Changes
----------------
- Update release script to insert the previous version when writing "No significant changes" line in the changelog. ([\#12127](https://github.com/matrix-org/synapse/issues/12127))
- Inspect application dependencies using `importlib.metadata` or its backport. ([\#12129](https://github.com/matrix-org/synapse/issues/12129))
- Relax the version guard for "packaging" added in #12088. ([\#12166](https://github.com/matrix-org/synapse/issues/12166))
- Relax the version guard for "packaging" added in ([\#12088](https://github.com/matrix-org/synapse/issues/12088)). ([\#12166](https://github.com/matrix-org/synapse/issues/12166))
