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Pin Cython<3.3 for pyzmq source-build compat (3007.x) #70119

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Pin Cython<3.3 for pyzmq source-build compat (3007.x) #70119

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1 change: 1 addition & 0 deletions changelog/70119.fixed.md
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Original file line number Diff line number Diff line change
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Pin Cython<3.3 for pyzmq source builds broken by Cython 3.3.0.
7 changes: 7 additions & 0 deletions requirements/constraints.txt
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Expand Up @@ -20,6 +20,13 @@ setuptools >= 78.1.1
# build envs on the pre-split 9.x series for every source build.
setuptools-scm < 10
pip == 26.0.1
# pyzmq 25.1.2 / 27.1.0 (both used across Salt onedirs) build from source under
# ``--no-binary=:all:`` and pull Cython unpinned via PEP 517. Cython 3.3.0
# (2026-08-22) rejects the redeclarations at zmq/backend/cython/_zmq.py:357
# (``hint``) and :1112 (``c_addr``). PIP_CONSTRAINT propagates to PEP 517
# build envs, so capping Cython here keeps pyzmq source builds green until
# pyzmq ships a fix.
Cython < 3.3
markdown-it-py < 3.0.0; python_version == "3.9"
# myst-docutils 4.x (the latest supporting Python 3.10) requires
# markdown-it-py ~=3.0; the 5.x line that pairs with markdown-it-py 4.x
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