Drop Python 3.11, declare and test up to Python 3.14

.github/workflows/nightly.yml

@@ -123,15 +123,15 @@ jobs:
           fetch-tags: true
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
         with:
-          version: "0.7.21"
-          python-version: "3.11"
+          version: "0.12.0"
+          python-version: "3.12"
           cache-suffix: ${{ matrix.package }}-lower-bound
       - name: Test with lowest direct dependencies
         working-directory: packages/${{ matrix.package }}
         run: uv run --extra=test --resolution=lowest-direct pytest
 
   latest-dependencies:
-    name: Latest dependencies ${{ matrix.package }}
+    name: Latest dependencies ${{ matrix.package }} py${{ matrix.python }}
     strategy:
       fail-fast: false
       matrix:
@@ -143,23 +143,54 @@ jobs:
           - essreflectometry
           - esssans
           - essspectroscopy
+        python: ["3.12", "3.13", "3.14"]
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v6
         with:
           fetch-tags: true
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
         with:
-          version: "0.7.21"
-          python-version: "3.11"
-          cache-suffix: ${{ matrix.package }}-latest
+          version: "0.12.0"
+          python-version: ${{ matrix.python }}
+          cache-suffix: ${{ matrix.package }}-latest-py${{ matrix.python }}
       - name: Test with latest dependencies
         working-directory: packages/${{ matrix.package }}
         run: uv run --extra=test --resolution=highest pytest
 
+  free-threaded:
+    name: Free-threaded ${{ matrix.package }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # Excluded packages that do not work on free-threaded Python yet:
+        # - essnmx: importing bitshuffle re-enables the GIL, which
+        #   filterwarnings = error escalates to a collection error.
+        # - essdiffraction: numba-jitted code aborts the interpreter when run
+        #   from dask worker threads.
+        package:
+          - essreduce
+          - essimaging
+          - essreflectometry
+          - esssans
+          - essspectroscopy
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-tags: true
+      - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+        with:
+          version: "0.12.0"
+          python-version: "3.14t"
+          cache-suffix: ${{ matrix.package }}-free-threaded
+      - name: Test on free-threaded Python
+        working-directory: packages/${{ matrix.package }}
+        run: uv run --extra=test pytest
+
   report-test-failure:
     name: Report nightly failures
-    needs: [ test, publish, lower-bound, latest-dependencies ]
+    needs: [ test, publish, lower-bound, latest-dependencies, free-threaded ]
     runs-on: ubuntu-slim
     if: failure() && github.event_name == 'schedule'
     env:
@@ -184,7 +215,7 @@ jobs:
 
   report-test-success:
     name: Report nightly success
-    needs: [ test, publish, lower-bound, latest-dependencies ]
+    needs: [ test, publish, lower-bound, latest-dependencies, free-threaded ]
     runs-on: ubuntu-slim
     if: github.ref == 'refs/heads/main'
     env:

.github/workflows/release.yml

@@ -72,7 +72,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v6
         with:
-          python-version: "3.11"
+          python-version: "3.12"
       - name: Copy LICENSE into package
         run: cp LICENSE packages/${{ needs.determine-package.outputs.package }}/LICENSE
       - name: Build package
@@ -157,7 +157,7 @@ jobs:
           fetch-depth: 0  # Fetch depth must be 0 otherwise the git log comment won't find all relevant commits between tags.
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # 6.2.0
         with:
-          python-version: "3.11"
+          python-version: "3.12"
       - name: Install dependencise
         run: pip install pydantic==2.13.3
       - name: Download PR metadata

.python-version

@@ -1 +1 @@
-3.11
+3.12

packages/essdiffraction/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: 024a41b
 _src_path: gh:scipp/copier_template
 description: Diffraction data reduction for the European Spallation Source
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: scipp,scippnexus,sciline,plopp,scippneutron,essreduce,tof
 orgname: scipp

packages/essdiffraction/pyproject.toml

@@ -17,13 +17,13 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 # IMPORTANT:
 # Run 'tox -e deps' after making changes here. This will update requirement files.

packages/essimaging/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: b87e087
 _src_path: gh:scipp/copier_template
 description: Imaging data reduction for the European Spallation Source
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: scipp,sciline,scippnexus,plopp,essreduce,scippneutron,tof,scitiff
 orgname: scipp

packages/essimaging/pyproject.toml

@@ -17,15 +17,15 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
 # The min python version should be updated in the root pixi.toml file
 # pre-commit will automatically update the following pin
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 dynamic = ["version"]
 

packages/essnmx/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: 0dae45f
 _src_path: gh:scipp/copier_template
 description: Data reduction for NMX at the European Spallation Source.
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: scipp,sciline,scippnexus,plopp
 orgname: scipp

packages/essnmx/pyproject.toml

@@ -18,13 +18,13 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 # IMPORTANT:
 # Run 'tox -e deps' after making changes here. This will update requirement files.

packages/essreduce/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: c3214e6
 _src_path: gh:scipp/copier_template
 description: Common data reduction tools for the ESS facility
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: scippnexus,scipp,sciline,cyclebane,scippneutron,tof
 orgname: scipp

packages/essreduce/pyproject.toml

@@ -17,23 +17,23 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
 # The min python version should be updated in the root pixi.toml file
 # pre-commit will automatically update the following pin
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 dynamic = ["version"]
 
 dependencies = [
     "dask>=2022.1.0",
     "graphviz>=0.20",
     "sciline>=25.11.0",
-    "scipp>=26.3.1",
+    "scipp>=26.7.0",
     "scippneutron>=26.6.0",
     "scippnexus>=25.06.0",
     "scipy>=1.14",

packages/essreflectometry/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: 024a41b
 _src_path: gh:scipp/copier_template
 description: Reflectometry data reduction for the European Spallation Source
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: plopp,sciline,scippneutron,scippnexus,scipp
 orgname: scipp

packages/essreflectometry/pyproject.toml

@@ -17,13 +17,13 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 # IMPORTANT:
 # Run 'tox -e deps' after making changes here. This will update requirement files.

packages/esssans/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: 7e41523
 _src_path: gh:scipp/copier_template
 description: SANS data reduction for the European Spallation Source
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: plopp,sciline,scippneutron,scippnexus,scipp,essreduce
 orgname: scipp

packages/esssans/pyproject.toml

@@ -17,15 +17,15 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
 # The min python version should be updated in the root pixi.toml file
 # pre-commit will automatically update the following pin
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 dynamic = ["version"]
 

packages/essspectroscopy/.copier-answers.yml

@@ -2,8 +2,8 @@
 _commit: 024a41b
 _src_path: gh:scipp/copier_template
 description: 'Spectroscopy data reduction for the European Spallation Source '
-max_python: '3.13'
-min_python: '3.11'
+max_python: '3.14'
+min_python: '3.12'
 namespace_package: ess
 nightly_deps: scipp,scippneutron,sciline,plopp,scippnexus,essreduce
 orgname: scipp

packages/essspectroscopy/pyproject.toml

@@ -18,13 +18,13 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Scientific/Engineering",
     "Typing :: Typed",
 ]
-requires-python = ">=3.11"
+requires-python = ">=3.12"
 
 # IMPORTANT:
 # Run 'tox -e deps' after making changes here. This will update requirement files.