SciTools · bjlittle · Jun 6, 2025 · Jun 6, 2025 · Jun 6, 2025 · Jun 6, 2025
diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
@@ -69,7 +69,7 @@ jobs:
 
     - name: "stratify tests (py${{ matrix.python-version }})"
       run: |
-        python setup.py build_ext --inplace
         python -m pip install --no-deps --editable .
+        python setup.py build_ext --inplace
         pytest ${{ matrix.cov-report }}
         ${{ matrix.codecov }}
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,7 +1,7 @@
 [build-system]
 # Defined by PEP 518
 requires = [
-  "Cython",
+  "Cython<3.1.0",
   "numpy>=2",
   "setuptools>=77.0.3",
   "setuptools_scm[toml]>=8",

diff --git a/requirements/locks/py310-linux-64.lock b/requirements/locks/py310-linux-64.lock
diff --git a/requirements/locks/py311-linux-64.lock b/requirements/locks/py311-linux-64.lock
diff --git a/requirements/locks/py312-linux-64.lock b/requirements/locks/py312-linux-64.lock
diff --git a/requirements/py310.yml b/requirements/py310.yml
@@ -12,7 +12,7 @@ dependencies:
 
 # Core dependencies.
   - numpy>=2
-  - cython
+  - cython<3.1.0
 
 # Optional dependencies.
   - dask

diff --git a/requirements/py311.yml b/requirements/py311.yml
@@ -12,7 +12,7 @@ dependencies:
 
 # Core dependencies.
   - numpy>=2
-  - cython
+  - cython<3.1.0
 
 # Optional dependencies.
   - dask

diff --git a/requirements/py312.yml b/requirements/py312.yml
@@ -12,7 +12,7 @@ dependencies:
 
 # Core dependencies.
   - numpy>=2
-  - cython
+  - cython<3.1.0
 
 # Optional dependencies.
   - dask

diff --git a/requirements/pypi-core.txt b/requirements/pypi-core.txt
@@ -1,3 +1,3 @@
-Cython
+Cython<3.1.0
 dask[array]
 numpy>=2