From 266b12ad07da8642ad6d4722ab3578f1b68fc23d Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 20 Nov 2025 14:10:36 +0000
Subject: [PATCH 01/17] ci: add cp315/cp315t to builds.

---
 dev/tasks/tasks.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dev/tasks/tasks.yml b/dev/tasks/tasks.yml
index 6cf11d66b9f1..c8451225ee8d 100644
--- a/dev/tasks/tasks.yml
+++ b/dev/tasks/tasks.yml
@@ -186,7 +186,10 @@ tasks:
                                                ("3.13", "cp313", "cp313"),
                                                ("3.13", "cp313", "cp313t"),
                                                ("3.14", "cp314", "cp314"),
-                                               ("3.14", "cp314", "cp314t")] %}
+                                               ("3.14", "cp314", "cp314t"),
+                                               ("3.15", "cp315", "cp315"),
+                                               ("3.15", "cp315", "cp315t")
+                                               ] %}
 
 {############################## Wheel Linux ##################################}
 

From 2d2a557e066505e911c02615911799644d2b70cd Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 20 Nov 2025 14:13:58 +0000
Subject: [PATCH 02/17] ci: add marker for cffi and pandas for < "3.15". this
 is temporary until they ship 3.15 wheels.

---
 python/requirements-test.txt       | 4 ++--
 python/requirements-wheel-test.txt | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/python/requirements-test.txt b/python/requirements-test.txt
index 4339aeb9c161..f6e1c5d0470c 100644
--- a/python/requirements-test.txt
+++ b/python/requirements-test.txt
@@ -1,7 +1,7 @@
-cffi
+cffi; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship
 hypothesis
 packaging
-pandas
+pandas; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship
 pytest
 pytz
 pyuwsgi; sys.platform != 'win32' and python_version < '3.13'
diff --git a/python/requirements-wheel-test.txt b/python/requirements-wheel-test.txt
index b2ff4553b455..71bdc3b23051 100644
--- a/python/requirements-wheel-test.txt
+++ b/python/requirements-wheel-test.txt
@@ -1,4 +1,4 @@
-cffi
+cffi; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship
 cython
 hypothesis
 packaging
@@ -18,4 +18,4 @@ numpy~=1.26.0; python_version == "3.12"
 numpy~=2.1.0; python_version == "3.13"
 numpy~=2.3.3; python_version >= "3.14"
 
-pandas
+pandas; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship

From 9ed3dc3bb7f316286681369015e617cb0df6b434 Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 10:18:53 -0400
Subject: [PATCH 03/17] bump libcst to 1.9.0 for Python 3.15

---
 ci/conda_env_python.txt             | 2 +-
 python/pyproject.toml               | 2 +-
 python/requirements-build.txt       | 2 +-
 python/requirements-wheel-build.txt | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/ci/conda_env_python.txt b/ci/conda_env_python.txt
index dd16d66b725d..f3768bf44c77 100644
--- a/ci/conda_env_python.txt
+++ b/ci/conda_env_python.txt
@@ -24,7 +24,7 @@ cython>=3.1
 cloudpickle
 fsspec
 hypothesis
-libcst>=1.8.6
+libcst>=1.9.0
 numpy>=1.16.6
 pytest
 pytest-faulthandler
diff --git a/python/pyproject.toml b/python/pyproject.toml
index fe508b855a87..8b8834213549 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -20,7 +20,7 @@ requires = [
     "scikit-build-core",
     "cython >= 3.1",
     # Needed for build-time stub docstring extraction
-    "libcst>=1.8.6",
+    "libcst>=1.9.0",
     "numpy>=1.25",
     "setuptools_scm[toml]>=8",
 ]
diff --git a/python/requirements-build.txt b/python/requirements-build.txt
index fdd3e68a1b16..3846387340e0 100644
--- a/python/requirements-build.txt
+++ b/python/requirements-build.txt
@@ -1,6 +1,6 @@
 build
 cython>=3.1
-libcst>=1.8.6
+libcst>=1.9.0
 numpy>=1.25
 scikit-build-core
 setuptools_scm>=8
diff --git a/python/requirements-wheel-build.txt b/python/requirements-wheel-build.txt
index a3ac13967729..5f3532deef68 100644
--- a/python/requirements-wheel-build.txt
+++ b/python/requirements-wheel-build.txt
@@ -1,7 +1,7 @@
 build
 cython>=3.1
 # Needed for build-time stub docstring extraction
-libcst>=1.8.6
+libcst>=1.9.0
 numpy>=2.0.0
 scikit-build-core
 setuptools_scm

From 9214919d614bcd4699f02209a6cfa9107b93dd3d Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 14:22:19 -0400
Subject: [PATCH 04/17] chore: bump manylinux image to 08.08 to include
 3.15-rc1

---
 compose.yaml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/compose.yaml b/compose.yaml
index c13bd831ecff..c551e5c18615 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -1154,7 +1154,7 @@ services:
       args:
         arch: ${ARCH}
         arch_short: ${ARCH_SHORT}
-        base: quay.io/pypa/manylinux_2_28_${ARCH_ALIAS}:2026.05.31-3
+        base: quay.io/pypa/manylinux_2_28_${ARCH_ALIAS}:2026.08.08-1
         manylinux: 2_28
         python: ${PYTHON}
         python_abi_tag: ${PYTHON_ABI_TAG}
@@ -1179,7 +1179,7 @@ services:
       args:
         arch: ${ARCH}
         arch_short: ${ARCH_SHORT}
-        base: quay.io/pypa/musllinux_1_2_${ARCH_ALIAS}:2026.05.31-3
+        base: quay.io/pypa/musllinux_1_2_${ARCH_ALIAS}:2026.08.08-1
         musllinux: 1_2
         python: ${PYTHON}
         python_abi_tag: ${PYTHON_ABI_TAG}

From 879a77749fdfd81f353d78a3a10788f86fcd67b5 Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 14:23:20 -0400
Subject: [PATCH 05/17] add -rc suffix for 3.15, since 3.15 is not yet
 released.

---
 dev/tasks/python-wheels/github.linux.yml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dev/tasks/python-wheels/github.linux.yml b/dev/tasks/python-wheels/github.linux.yml
index e211343953bf..a6344bbec241 100644
--- a/dev/tasks/python-wheels/github.linux.yml
+++ b/dev/tasks/python-wheels/github.linux.yml
@@ -42,7 +42,12 @@ jobs:
       {% endif %}
       PYTHON: "{{ python_version }}"
       PYTHON_ABI_TAG: "{{ python_abi_tag }}"
+      {% if python_version == "3.15" %}
+      # TODO: Remove -rc suffix after 3.15 release
+      PYTHON_IMAGE_TAG: "{{ python_version }}-rc"
+      {% else %}
       PYTHON_IMAGE_TAG: "{{ python_version }}"
+      {% endif %}
 
     steps:
       {{ macros.github_checkout_arrow()|indent }}

From b6d48c65fa1f015b01da5959904d2297dc2ad450 Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 14:26:33 -0400
Subject: [PATCH 06/17] disable pandas tests for cp315 by checking whether
 pandas is installed, which doesn't yet have wheels

---
 ci/scripts/python_wheel_unix_test.sh     | 3 +++
 ci/scripts/python_wheel_windows_test.bat | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/ci/scripts/python_wheel_unix_test.sh b/ci/scripts/python_wheel_unix_test.sh
index cb445611e233..265f5ebcffb4 100755
--- a/ci/scripts/python_wheel_unix_test.sh
+++ b/ci/scripts/python_wheel_unix_test.sh
@@ -104,6 +104,9 @@ if [ "${CHECK_UNITTESTS}" == "ON" ]; then
   # Install testing dependencies
   python -m pip install -U -r "${source_dir}/python/requirements-wheel-test.txt"
 
+  # TODO: This check added for cp315, which does not yet have pandas wheels. Remove when shipped. 
+  python -c "import pandas" 2>/dev/null || export PYARROW_TEST_PANDAS=OFF
+
   # Execute unittest, test dependencies must be installed
   python -c 'import pyarrow; pyarrow.create_library_symlinks()'
   python -m pytest -r s --pyargs pyarrow
diff --git a/ci/scripts/python_wheel_windows_test.bat b/ci/scripts/python_wheel_windows_test.bat
index 1e9cacac8bfa..b9685d6f7cd1 100755
--- a/ci/scripts/python_wheel_windows_test.bat
+++ b/ci/scripts/python_wheel_windows_test.bat
@@ -60,5 +60,8 @@ py -0p
 @REM Validate wheel contents
 %PYTHON_CMD% C:\arrow\ci\scripts\python_wheel_validate_contents.py --path C:\arrow\python\repaired_wheels || exit /B 1
 
+@REM TODO: This check added for cp315, which does not yet have pandas wheels. Remove when shipped. 
+%PYTHON_CMD% -c "import pandas" 2>NUL || set PYARROW_TEST_PANDAS=OFF
+
 @REM Execute unittest
 %PYTHON_CMD% -m pytest -r s --pyargs pyarrow || exit /B 1

From 89f007d887aede25e59bcf2d688030f00256c6e9 Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 14:33:01 -0400
Subject: [PATCH 07/17] reenable cffi for cp315

---
 python/requirements-wheel-test.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/requirements-wheel-test.txt b/python/requirements-wheel-test.txt
index ea402a1e66c2..d5994748b160 100644
--- a/python/requirements-wheel-test.txt
+++ b/python/requirements-wheel-test.txt
@@ -1,4 +1,4 @@
-cffi; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship
+cffi
 cython
 hypothesis
 packaging

From e8fc497d75cd6adf45b3e42334ec0f2dfca3a4b5 Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 14:48:09 -0400
Subject: [PATCH 08/17] reenable cffi on 3.15

---
 python/requirements-test.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/requirements-test.txt b/python/requirements-test.txt
index f56d74670ee0..6af9aba6aeb3 100644
--- a/python/requirements-test.txt
+++ b/python/requirements-test.txt
@@ -1,4 +1,4 @@
-cffi; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship
+cffi
 hypothesis
 packaging
 pandas; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship

From 5de3f4badb9643896eb68697b7c57021453be0bf Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Thu, 13 Aug 2026 14:48:41 -0400
Subject: [PATCH 09/17] numpy 2.5.2 is minimum for 3.15-rc1

---
 python/requirements-wheel-test.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/requirements-wheel-test.txt b/python/requirements-wheel-test.txt
index d5994748b160..00c0fcc4684f 100644
--- a/python/requirements-wheel-test.txt
+++ b/python/requirements-wheel-test.txt
@@ -16,6 +16,7 @@ numpy~=1.23.2; python_version < "3.11"
 numpy~=1.23.2; python_version == "3.11"
 numpy~=1.26.0; python_version == "3.12"
 numpy~=2.1.0; python_version == "3.13"
-numpy~=2.3.3; python_version >= "3.14"
+numpy~=2.3.3; python_version == "3.14"
+numpy~=2.5.2; python_version == "3.15"  # TODO: 2.5.2 is for 3.15-rc1, after release, update to correct version  
 
 pandas; python_version < "3.15"  # TODO: temporary - reenable when 3.15 wheels ship

From 7046bfa28a5cfc114d7a8344d7c83abaa1a9e7a4 Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Fri, 14 Aug 2026 08:49:23 -0400
Subject: [PATCH 10/17] ALPINE_LINUX => 3.23: Python is no longer rebuilt on
 3.22

---
 dev/tasks/python-wheels/github.linux.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dev/tasks/python-wheels/github.linux.yml b/dev/tasks/python-wheels/github.linux.yml
index a6344bbec241..e485a1440bcd 100644
--- a/dev/tasks/python-wheels/github.linux.yml
+++ b/dev/tasks/python-wheels/github.linux.yml
@@ -32,7 +32,7 @@ jobs:
     {% endif %}
     env:
       {% if linux_wheel_kind == "musllinux" %}
-      ALPINE_LINUX: "3.22"
+      ALPINE_LINUX: "3.23"
       {% endif %}
       # archery uses these environment variables
       {% if arch == "amd64" %}

From 6fb35d8eb7d46bfb1ea96ca977bef29749daa8ce Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Fri, 14 Aug 2026 09:09:20 -0400
Subject: [PATCH 11/17] Use a version gate, rather than import gate, for 3.15
 pandas

---
 ci/scripts/python_wheel_unix_test.sh     | 10 ++++++----
 ci/scripts/python_wheel_windows_test.bat |  7 +++----
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/ci/scripts/python_wheel_unix_test.sh b/ci/scripts/python_wheel_unix_test.sh
index 265f5ebcffb4..14fccc05a786 100755
--- a/ci/scripts/python_wheel_unix_test.sh
+++ b/ci/scripts/python_wheel_unix_test.sh
@@ -47,7 +47,12 @@ export PYARROW_TEST_GANDIVA=OFF
 export PYARROW_TEST_GCS=${ARROW_GCS}
 export PYARROW_TEST_HDFS=ON
 export PYARROW_TEST_ORC=ON
-export PYARROW_TEST_PANDAS=ON
+# TODO: To be removed once pandas provides wheels for Python 3.15
+if python -c "import sys; sys.exit(0 if sys.version_info < (3, 15) else 1)"; then
+  export PYARROW_TEST_PANDAS=ON
+else
+  export PYARROW_TEST_PANDAS=OFF
+fi
 export PYARROW_TEST_PARQUET=ON
 export PYARROW_TEST_PARQUET_ENCRYPTION=ON
 export PYARROW_TEST_SUBSTRAIT=${ARROW_SUBSTRAIT}
@@ -104,9 +109,6 @@ if [ "${CHECK_UNITTESTS}" == "ON" ]; then
   # Install testing dependencies
   python -m pip install -U -r "${source_dir}/python/requirements-wheel-test.txt"
 
-  # TODO: This check added for cp315, which does not yet have pandas wheels. Remove when shipped. 
-  python -c "import pandas" 2>/dev/null || export PYARROW_TEST_PANDAS=OFF
-
   # Execute unittest, test dependencies must be installed
   python -c 'import pyarrow; pyarrow.create_library_symlinks()'
   python -m pytest -r s --pyargs pyarrow
diff --git a/ci/scripts/python_wheel_windows_test.bat b/ci/scripts/python_wheel_windows_test.bat
index b9685d6f7cd1..9d4d06249e4d 100755
--- a/ci/scripts/python_wheel_windows_test.bat
+++ b/ci/scripts/python_wheel_windows_test.bat
@@ -26,7 +26,9 @@ set PYARROW_TEST_GANDIVA=OFF
 set PYARROW_TEST_GCS=ON
 set PYARROW_TEST_HDFS=ON
 set PYARROW_TEST_ORC=ON
-set PYARROW_TEST_PANDAS=ON
+@REM TODO: To be removed once pandas provides wheels for Python 3.15
+%PYTHON_CMD% -c "import sys; sys.exit(0 if sys.version_info < (3, 15) else 1)"
+if errorlevel 1 (set PYARROW_TEST_PANDAS=OFF) else (set PYARROW_TEST_PANDAS=ON)
 set PYARROW_TEST_PARQUET=ON
 set PYARROW_TEST_PARQUET_ENCRYPTION=ON
 set PYARROW_TEST_SUBSTRAIT=ON
@@ -60,8 +62,5 @@ py -0p
 @REM Validate wheel contents
 %PYTHON_CMD% C:\arrow\ci\scripts\python_wheel_validate_contents.py --path C:\arrow\python\repaired_wheels || exit /B 1
 
-@REM TODO: This check added for cp315, which does not yet have pandas wheels. Remove when shipped. 
-%PYTHON_CMD% -c "import pandas" 2>NUL || set PYARROW_TEST_PANDAS=OFF
-
 @REM Execute unittest
 %PYTHON_CMD% -m pytest -r s --pyargs pyarrow || exit /B 1

From 521c6ec76e853b5e7a8086358806b8409e73df5e Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Fri, 14 Aug 2026 09:16:05 -0400
Subject: [PATCH 12/17] Add Python 3.15.0rc1: bump build_date to 20260807, add
 3.15.0rc1 and (maintenance) bump 3.14.5 to 3.14.7

---
 ...thon-free-threaded-wheel-musllinux-test-imports.dockerfile | 3 ++-
 ...on-free-threaded-wheel-musllinux-test-unittests.dockerfile | 3 ++-
 compose.yaml                                                  | 4 ++--
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/ci/docker/python-free-threaded-wheel-musllinux-test-imports.dockerfile b/ci/docker/python-free-threaded-wheel-musllinux-test-imports.dockerfile
index af56749202d4..69ddaf70d589 100644
--- a/ci/docker/python-free-threaded-wheel-musllinux-test-imports.dockerfile
+++ b/ci/docker/python-free-threaded-wheel-musllinux-test-imports.dockerfile
@@ -35,7 +35,8 @@ RUN apk update && \
 # See available releases at: https://github.com/astral-sh/python-build-standalone/releases
 RUN set -e; \
     case "${python_version}" in \
-      3.14) python_patch_version="3.14.5";; \
+      3.14) python_patch_version="3.14.7";; \
+      3.15) python_patch_version="3.15.0rc1";; \
     esac && \
     curl -L -o python.tar.zst \
     https://github.com/astral-sh/python-build-standalone/releases/download/${build_date}/cpython-${python_patch_version}+${build_date}-${arch}-unknown-linux-musl-freethreaded+lto-full.tar.zst && \
diff --git a/ci/docker/python-free-threaded-wheel-musllinux-test-unittests.dockerfile b/ci/docker/python-free-threaded-wheel-musllinux-test-unittests.dockerfile
index 7efcd2107a81..f1e959675467 100644
--- a/ci/docker/python-free-threaded-wheel-musllinux-test-unittests.dockerfile
+++ b/ci/docker/python-free-threaded-wheel-musllinux-test-unittests.dockerfile
@@ -37,7 +37,8 @@ RUN apk update && \
 # See available releases at: https://github.com/astral-sh/python-build-standalone/releases
 RUN set -e; \
     case "${python_version}" in \
-      3.14) python_patch_version="3.14.5";; \
+      3.14) python_patch_version="3.14.7";; \
+      3.15) python_patch_version="3.15.0rc1";; \
     esac && \
     curl -L -o python.tar.zst \
     https://github.com/astral-sh/python-build-standalone/releases/download/${build_date}/cpython-${python_patch_version}+${build_date}-${arch}-unknown-linux-musl-freethreaded+lto-full.tar.zst && \
diff --git a/compose.yaml b/compose.yaml
index c551e5c18615..ef30e2568452 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -1220,7 +1220,7 @@ services:
       args:
         base: "alpine:${ALPINE_LINUX}"
         python_version: ${PYTHON}
-        build_date: "20260510"  # python-build-standalone release date
+        build_date: "20260807"  # python-build-standalone release date
         arch: ${ARCH_ALIAS}
       context: .
       dockerfile: ci/docker/python-free-threaded-wheel-musllinux-test-imports.dockerfile
@@ -1264,7 +1264,7 @@ services:
       args:
         base: "alpine:${ALPINE_LINUX}"
         python_version: ${PYTHON}
-        build_date: "20260510"  # python-build-standalone release date
+        build_date: "20260807"  # python-build-standalone release date
         arch: ${ARCH_ALIAS}
       context: .
       dockerfile: ci/docker/python-free-threaded-wheel-musllinux-test-unittests.dockerfile

From 5b13d85415413931fcc1dafee45bbb2585e4946d Mon Sep 17 00:00:00 2001
From: "paul@iqmo.com" <paul@iqmo.com>
Date: Fri, 14 Aug 2026 10:58:27 -0400
Subject: [PATCH 13/17] bump image revision

---
 .env | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.env b/.env
index 980dc243b83f..81486f0e9be9 100644
--- a/.env
+++ b/.env
@@ -98,5 +98,5 @@ VCPKG="9b965a116838c6cdcd36bca60d1b81b030c8ab8d"    # 2026.05.27 (not release, u
 # ci/docker/python-*-windows-*.dockerfile or the vcpkg config.
 # This is a workaround for our CI problem that "archery docker build" doesn't
 # use pulled built images in dev/tasks/python-wheels/github.windows.yml.
-PYTHON_WHEEL_WINDOWS_IMAGE_REVISION=2026-06-03
-PYTHON_WHEEL_WINDOWS_TEST_IMAGE_REVISION=2026-06-03
+PYTHON_WHEEL_WINDOWS_IMAGE_REVISION=2026-08-14
+PYTHON_WHEEL_WINDOWS_TEST_IMAGE_REVISION=2026-08-14

From 7e5f9008d825f504ce5afed4ddc4b4a4e46cb476 Mon Sep 17 00:00:00 2001
From: "paul@iqmo.com" <paul@iqmo.com>
Date: Fri, 14 Aug 2026 10:59:07 -0400
Subject: [PATCH 14/17] add 3.15 for windows dockerfiles, and maintenance: move
 3.14.5 to latest 3.14.7

---
 ...hon-free-threaded-wheel-windows-test-vs2022.dockerfile | 8 ++++++--
 ci/docker/python-wheel-windows-test-vs2022.dockerfile     | 3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/ci/docker/python-free-threaded-wheel-windows-test-vs2022.dockerfile b/ci/docker/python-free-threaded-wheel-windows-test-vs2022.dockerfile
index d0d9793d1f71..684596e50104 100644
--- a/ci/docker/python-free-threaded-wheel-windows-test-vs2022.dockerfile
+++ b/ci/docker/python-free-threaded-wheel-windows-test-vs2022.dockerfile
@@ -26,13 +26,17 @@ FROM ${base}
 
 ARG python=3.14
 
+# PYTHON_RELEASE is the python.org ftp directory, which for a pre-release is the
+# final release it leads to, e.g. 3.15.0/python-3.15.0rc1-amd64.exe
 # hadolint ignore=SC1072
-RUN (if "%python%"=="3.14" setx PYTHON_VERSION "3.14.5")
+RUN (if "%python%"=="3.14" setx PYTHON_VERSION "3.14.7" && setx PYTHON_RELEASE "3.14.7") & \
+    (if "%python%"=="3.15" setx PYTHON_VERSION "3.15.0rc1" && setx PYTHON_RELEASE "3.15.0")
 
 SHELL ["powershell", "-NoProfile", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 RUN $version = $env:PYTHON_VERSION; \
+    $release = $env:PYTHON_RELEASE; \
     $filename = 'python-' + $version + '-amd64.exe'; \
-    $url = 'https://www.python.org/ftp/python/' + $version + '/' + $filename; \
+    $url = 'https://www.python.org/ftp/python/' + $release + '/' + $filename; \
     Invoke-WebRequest -Uri $url -OutFile $filename; \
     Start-Process -FilePath $filename -ArgumentList '/quiet', 'Include_freethreaded=1' -Wait
 
diff --git a/ci/docker/python-wheel-windows-test-vs2022.dockerfile b/ci/docker/python-wheel-windows-test-vs2022.dockerfile
index 73a9e167fea6..e440f7a2e8a6 100644
--- a/ci/docker/python-wheel-windows-test-vs2022.dockerfile
+++ b/ci/docker/python-wheel-windows-test-vs2022.dockerfile
@@ -32,7 +32,8 @@ RUN (if "%python%"=="3.10" setx PYTHON_VERSION "3.10.11" && setx PYTHON_CMD "py
     (if "%python%"=="3.11" setx PYTHON_VERSION "3.11.9" && setx PYTHON_CMD "py -3.11") & \
     (if "%python%"=="3.12" setx PYTHON_VERSION "3.12.10" && setx PYTHON_CMD "py -3.12") & \
     (if "%python%"=="3.13" setx PYTHON_VERSION "3.13.9" && setx PYTHON_CMD "py -3.13") & \
-    (if "%python%"=="3.14" setx PYTHON_VERSION "3.14.0" && setx PYTHON_CMD "py -3.14")
+    (if "%python%"=="3.14" setx PYTHON_VERSION "3.14.0" && setx PYTHON_CMD "py -3.14") & \
+    (if "%python%"=="3.15" setx PYTHON_VERSION "3.15.0-rc1" && setx PYTHON_CMD "py -3.15")
 
 # hadolint ignore=DL3059
 RUN choco install -r -y --pre --no-progress --force python --version=%PYTHON_VERSION%

From bb049d5ec66216129d5faea0dac5c6803e05e33d Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Fri, 14 Aug 2026 19:21:50 -0400
Subject: [PATCH 15/17] add 3.15.0rc1 (and bump 3.14.6 to latest: 3.14.7)

---
 ci/scripts/install_python.sh | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/ci/scripts/install_python.sh b/ci/scripts/install_python.sh
index f6502b1be8ce..3939e5154b70 100755
--- a/ci/scripts/install_python.sh
+++ b/ci/scripts/install_python.sh
@@ -28,8 +28,11 @@ declare -A versions
 versions=([3.11]=3.11.9
           [3.12]=3.12.10
           [3.13]=3.13.14
-          [3.14]=3.14.6
-          [3.14t]=3.14.6)
+          [3.14]=3.14.7
+          [3.14t]=3.14.7
+          [3.15]=3.15.0rc1
+          [3.15t]=3.15.0rc1
+          )
 
 if [ "$#" -ne 2 ]; then
   echo "Usage: $0 <platform> <version>"
@@ -50,7 +53,7 @@ if [ "$platform" = "macOS" ]; then
     wget "https://www.python.org/ftp/python/${full_version}/${fname}"
 
     echo "Installing Python..."
-    if [[ $2 == "3.14t" ]]; then
+    if [[ $2 == *t ]]; then
         # Extract the base version without 't' suffix
         base_version="${version%t}"
         # See https://github.com/python/cpython/issues/120098#issuecomment-2151122033 for more info on this.
@@ -78,7 +81,7 @@ EOF
     rm "$fname"
 
     python="/Library/Frameworks/Python.framework/Versions/${version}/bin/python${version}"
-    if [[ $2 == "3.14t" ]]; then
+    if [[ $2 == *t ]]; then
         base_version="${version%t}"
         python="/Library/Frameworks/PythonT.framework/Versions/${base_version}/bin/python${base_version}t"
     fi

From 7bf40dcb25d8ac85721888e3f5c724b9a85ce87f Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Fri, 14 Aug 2026 21:18:09 -0400
Subject: [PATCH 16/17] disable --only-binary for 3.15 as a temp workaround for
 missing builds. Other platforms don't use --only-binary so built around this
 issue.

---
 ci/scripts/python_wheel_macos_build.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ci/scripts/python_wheel_macos_build.sh b/ci/scripts/python_wheel_macos_build.sh
index b931dfa4dd23..4724f8e15246 100755
--- a/ci/scripts/python_wheel_macos_build.sh
+++ b/ci/scripts/python_wheel_macos_build.sh
@@ -48,9 +48,15 @@ else
   exit 1
 fi
 
+wheel_build_binary_flag="--only-binary=:all:"
+if python -c "import sys; sys.exit(0 if sys.version_info[:2] == (3, 15) else 1)"; then
+  # TODO: 3.15 workaround due to pyyaml (via libcst). Remove once pyyaml ships 3.15 wheels.
+  wheel_build_binary_flag=""
+fi
+
 pip install \
   --force-reinstall \
-  --only-binary=:all: \
+  ${wheel_build_binary_flag} \
   --upgrade \
   -r "${source_dir}/python/requirements-wheel-build.txt"
 pip install "delocate>=0.10.3"

From 1b9702dc0e1a7f331a17c8a6deb15b0efd44f6ba Mon Sep 17 00:00:00 2001
From: Paul Timmins <paul@iqmo.com>
Date: Sat, 15 Aug 2026 21:51:36 -0400
Subject: [PATCH 17/17] Truncate pre-release suffixes

---
 ci/scripts/install_python.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ci/scripts/install_python.sh b/ci/scripts/install_python.sh
index 3939e5154b70..7aeda91f727d 100755
--- a/ci/scripts/install_python.sh
+++ b/ci/scripts/install_python.sh
@@ -49,8 +49,11 @@ full_version=${versions[$2]}
 if [ "$platform" = "macOS" ]; then
     echo "Downloading Python installer..."
 
+    # Match python.org directory by truncating any pre-release suffix: 
+    # 3.15.0rc1 is https://www.python.org/ftp/python/3.15.0/python-3.15.0rc1-macos11.pkg
+    release_version="${full_version%%[abrc]*}"
     fname="python-${full_version}-macos11.pkg"
-    wget "https://www.python.org/ftp/python/${full_version}/${fname}"
+    wget "https://www.python.org/ftp/python/${release_version}/${fname}"
 
     echo "Installing Python..."
     if [[ $2 == *t ]]; then