Dear Spring community,
5.1.4 is a significant refinement release, addressing several regressions and gaps that have been identified since 5.1 GA, coming as an immediate upgrade for all 5.1.x users.
Please note that 5.0.12 is the last planned 5.0.x release, with 5.0 approaching its EOL in March 2019. All 5.0.x users are encouraged to upgrade to 5.1.4+ for further fixes and refinements.
The 4.3.x line reaches an extended support phase now, with no regular maintenance being planned beyond 4.3.22 anymore but serious issues still to be addressed in infrequent releases on demand. No official EOL date has been set yet; we expect it around mid 2020.
Development towards 5.2 will start in our master branch soon, with 5.2 RC1 expected in May. On a related note, we are about to migrate from JIRA to GitHub issues; stay tuned!