This issue tracks the progress of version 1.4.0 of Poetry. Please surface any blockers or concerns you have regarding this minor release here:

Blockers

• ✅ poetry-core release
  • blockers
    • performance fix for simplified marker simplifications poetry-core#547
      (avoid potential performance regression)
    • PEP 440 compliance: do not implicitly allow pre-releases poetry-core#543
      (avoid inconsistence due to merged downstream PRs)
    • build: do not generate setup.py by default poetry-core#318
      (already announced in 1.3 blog post)
  • important fixes
    • markers: fix get_python_constraint_by_marker() for multi markers and marker unions without python_version poetry-core#546
  • nice to have
    • Allow non-existent path dependencies - reloaded poetry-core#520
    • Generic constraint intersection and union poetry-core#515
• ✅ poetry-plugin-export release
• cleo release
  • Fix terminal size detection cleo#299
• Faster build and installation of packages #6205
  (is waiting for core release)
  • installer: remove old installer and config setting experimental.new-installer #7356
    or installer: deprecate old installer (setting experimental.new-installer to false) #7358
• Fail with comprehensible error message if path dependencies do not exist #6844
  (only if Allow non-existent path dependencies - reloaded poetry-core#520 makes it in)
• chore: remove deprecated repository modules #7468
• Changelog: release: bump version to 1.4.0 #7531
• Release notes (blog): blog: announce poetry 1.4.0 website#109

Nice to have

• feat: respect virtualenvs.prefer-active-python on poetry new and init #7100
• fix(env): get full python path for appropriate executable #7221
• Add tests for pyproject with multiple readme files #6678 (tests for upstream change)
• Add an option to set output directory on build #7208 (waiting for core release)

Important changes to surface

(This is intended to be the basis for the blog post and should cover new features or any manual steps/incompatibility when upgrading)

• This release will turn off generation of setup.py by default (build: do not generate setup.py by default poetry-core#318)