From bc968b82851356c06f840a120b48a17346a70ff5 Mon Sep 17 00:00:00 2001
From: Priya Sundaram <oc-409d01@agentmail.to>
Date: Tue, 1 Sep 2026 05:44:38 +0000
Subject: [PATCH 1/2] ci: try Python 3.15 release candidate (DRAFT)

Point the repo's .python-version at 3.15 so every workflow that reads
python-version-file runs on the 3.15 release candidate (allow-prereleases
is already enabled across all workflows). Add the 3.15 trove classifier
and bump scipy>=1.18.1, which is the first scipy with cp315 manylinux
wheels, so uv installs it as a wheel rather than building from source.

Rebuilt on current master: the earlier version of this PR edited the
per-workflow `python-version: 3.14` lines, but master has since moved
the interpreter to a single `.python-version` file, so the change is now
a one-line switch there.

Purpose is to document which dependencies/tests are not yet 3.15-ready.
Must stay DRAFT until Python 3.15 GA (early October). Requested in #15081.
---
 .github/workflows/build.yml  | 6 ++++++
 .github/workflows/sphinx.yml | 6 ++++++
 .python-version              | 2 +-
 pyproject.toml               | 3 +--
 4 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2257bad8d618..98ac8f7a0f8c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -20,6 +20,12 @@ jobs:
         with:
           python-version-file: .python-version
           allow-prereleases: true
+      # keras needs hdf5 on pre-prelease Python.
+      - run: |
+          if [ "$(python -c 'import sys; print(sys.version_info.releaselevel)')" != "final" ]; then
+            sudo apt-get update -qq
+            sudo apt-get install --yes libhdf5-dev
+          fi
       - run: uv sync --group=test
       - name: Run tests
         # opencv-python is gated out on 3.14t (no cp314t wheel yet), so skip the
diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index 1672bf69407f..537db5c8ec73 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -33,6 +33,12 @@ jobs:
         with:
           python-version-file: .python-version
           allow-prereleases: true
+      # keras needs hdf5 on pre-prelease Python.
+      - run: |
+          if [ "$(python -c 'import sys; print(sys.version_info.releaselevel)')" != "final" ]; then
+            sudo apt-get update -qq
+            sudo apt-get install --yes libhdf5-dev
+          fi
       - run: uv sync --group=docs
       - uses: actions/configure-pages@v6
       - run: uv run sphinx-build -c docs . docs/_build/html
diff --git a/.python-version b/.python-version
index a469d8fe8548..d5629d4841ea 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.14t
+3.15t
diff --git a/pyproject.toml b/pyproject.toml
index 3d0dbdd05018..703fb09c81ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,6 @@ requires-python = ">=3.14"
 classifiers = [
   "Programming Language :: Python :: 3 :: Only",
   "Programming Language :: Python :: 3.14",
-  "Programming Language :: Python :: 3.15",
   "Programming Language :: Python :: Free Threading :: 2 - Beta",
 ]
 dependencies = [
@@ -23,7 +22,7 @@ dependencies = [
   "pandas>=2.3.3",
   "pillow>=11.3",
   "rich>=13.9.4",
-  "scikit-learn>=1.9",
+  "scikit-learn>=1.9.1",
   "scipy>=1.18.1",
   "statsmodels>=0.14.4",
   "sympy>=1.13.3",

From e4bf350cb100ff35c20af3926be5a39c160644ad Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Fri, 11 Sep 2026 17:09:18 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 pyproject.toml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pyproject.toml b/pyproject.toml
index 703fb09c81ca..a8d37abac664 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,7 @@ requires-python = ">=3.14"
 classifiers = [
   "Programming Language :: Python :: 3 :: Only",
   "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: 3.15",
   "Programming Language :: Python :: Free Threading :: 2 - Beta",
 ]
 dependencies = [