From 91c984224c91391ad1c09ffbc86aff3e4fe2cf70 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:03:37 -0700
Subject: [PATCH 01/16] Add support for Python 3.16.

---
 .github/workflows/ci.yml      | 60 +++++++++++++++--------------------
 .github/workflows/release.yml | 29 +++++++++++------
 setup.py                      |  5 +--
 tox.ini                       |  1 +
 4 files changed, 49 insertions(+), 46 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 30b7dae..79931c6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,14 +18,14 @@ jobs:
     steps:
       - name: Noop
         run: "true"
-  tests-36-38:
+  tests-36-37:
     name: (${{ matrix.os }}) Python ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }} Tests
     needs: org-check
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-24.04, macos-13]
-        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18]]
+        python-version: [[3, 6, 15], [3, 7, 17]]
     steps:
       - name: Checkout p537
         uses: actions/checkout@v5
@@ -40,53 +40,43 @@ jobs:
           command: pip install -U tox
       - name: Run Unit Tests
         run: tox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }}
-  tests-39-315:
-    name: (${{ matrix.os }}) Python 3.9 - 3.15 Tests
+  tests-38-316:
+    name: (${{ matrix.os }}) Python 3.8 - 3.16 Tests
     needs: org-check
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-24.04, macos-13, windows-2025]
+        os: [ubuntu-24.04, macos-15, windows-2025]
     steps:
       - name: Checkout p537
         uses: actions/checkout@v5
-      - name: Setup Python 3.9
-        uses: actions/setup-python@v6
+      - name: Setup uv
+        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
         with:
-          python-version: "3.9"
-      - name: Setup Python 3.10
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.10"
-      - name: Setup Python 3.11
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.11"
-      - name: Setup Python 3.12
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.12"
-      - name: Setup Python 3.13
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.13"
-      - name: Setup Python 3.14
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.14"
-      - name: Setup Python 3.15
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.15.0-alpha.1"
+          version: "0.13.1"
+      - name: Setup Pythons
+        shell: bash
+        run: |
+          export UV_PYTHON_INSTALL_DIR="${PWD}/uv-pythons"
+          uv python install --managed-python --force 3.{8..16}
+          uv python list \
+            --only-installed \
+            --managed-python \
+            --output-format json 2>/dev/null | \
+              jq -r '.[] | .path' | \
+              grep uv-pythons/ | \
+              xargs dirname | whil read entry; do
+                echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
+              done
       - name: Run Unit Tests
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
         with:
-          tox-env: py39,py310,py311,py312,py313,py314,py315
+          tox-env: py38,py39,py310,py311,py312,py313,py314,py315,py316
   final-status:
     name: Gather Final Status
     needs:
-      - tests-36-38
-      - tests-39-315
+      - tests-36-37
+      - tests-38-316
     runs-on: ubuntu-24.04
     steps:
       - name: Check Non-Success
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 36ef0d2..9995817 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,14 +39,14 @@ jobs:
             echo "::error::Release tag '${RELEASE_TAG}' must match 'v\d+.\d+.\d+'."
             exit 1
           fi
-  package-36-38-dists:
+  package-36-37-dists:
     name: ${{ matrix.os }} Package for Python ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }}
     needs: determine-tag
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-24.04, macos-13]
-        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18]]
+        python-version: [[3, 6, 15], [3, 7, 17]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
         uses: actions/checkout@v5
@@ -69,23 +69,34 @@ jobs:
           name: "${{ matrix.os }}-${{ needs.determine-tag.outputs.release-tag }}-${{ join(matrix.python-version, '.') }}-distributions"
           path: dist/
           retention-days: 1
-  package-39-315-dists:
+  package-38-316-dists:
     name: ${{ matrix.os }} Package for Python ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }}
     needs: determine-tag
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-24.04, macos-13, windows-2025]
-        python-version: [[3, 9], [3, 10], [3, 11], [3, 12], [3, 13], [3, 14], [3, 15, "0-alpha.1"]]
+        python-version: [[3, 8], [3, 9], [3, 10], [3, 11], [3, 12], [3, 13], [3, 14], [3, 15], [3, 16]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
         uses: actions/checkout@v5
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: Setup Python ${{ join(matrix.python-version, '.') }}
-        uses: actions/setup-python@v6
-        with:
-          python-version: "${{ join(matrix.python-version, '.') }}"
+        shell: bash
+        run: |
+          export UV_PYTHON_INSTALL_DIR="${PWD}/uv-pythons"
+          uv python install --managed-python --force ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }}
+          uv python list \
+            --only-installed \
+            --managed-python \
+            --output-format json \
+            ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }} 2>/dev/null | \
+              jq -r '.[] | .path' | \
+              grep uv-pythons/ | \
+              xargs dirname | whil read entry; do
+                echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
+              done
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
         with:
@@ -100,8 +111,8 @@ jobs:
     name: Publish sdist and wheel to PyPI
     needs:
       - determine-tag
-      - package-36-38-dists
-      - package-39-315-dists
+      - package-36-37-dists
+      - package-38-316-dists
     runs-on: ubuntu-24.04
     environment: Release
     permissions:
diff --git a/setup.py b/setup.py
index 0186c86..5c72977 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ def long_description():
 
 setup(
   name='p537',
-  version='1.0.10',
+  version='1.0.11',
   author="John Sirois",
   author_email="john.sirois@gmail.com",
   description='A tiny platform-specific distribution with a console script.',
@@ -33,8 +33,9 @@ def long_description():
     'Programming Language :: Python :: 3.14',
     'Programming Language :: Python :: 3.14',
     'Programming Language :: Python :: 3.15',
+    'Programming Language :: Python :: 3.16',
   ],
-  python_requires=">=3.6,<3.16",
+  python_requires=">=3.6,<3.17",
   ext_modules=[
     Extension('p537', sources=['p537module.c']),
   ],
diff --git a/tox.ini b/tox.ini
index c705cbf..0138691 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,7 @@ envlist =
     py313
     py314
     py315
+    py316
 
 [testenv]
 deps =

From 874fd9382efc9e2b336a6ef03a3c0f262fe8cdb5 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:04:59 -0700
Subject: [PATCH 02/16] Fix typo.

---
 .github/workflows/ci.yml      | 2 +-
 .github/workflows/release.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 79931c6..428d5a9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,7 +65,7 @@ jobs:
             --output-format json 2>/dev/null | \
               jq -r '.[] | .path' | \
               grep uv-pythons/ | \
-              xargs dirname | whil read entry; do
+              xargs dirname | while read entry; do
                 echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
               done
       - name: Run Unit Tests
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9995817..72629bf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -94,7 +94,7 @@ jobs:
             ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }} 2>/dev/null | \
               jq -r '.[] | .path' | \
               grep uv-pythons/ | \
-              xargs dirname | whil read entry; do
+              xargs dirname | while read entry; do
                 echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
               done
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}

From 998e9b151fc8b00d8830c9ca79b49ca7b7e02950 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:10:13 -0700
Subject: [PATCH 03/16] Allow pip upgrade in uv managed Pythons.

---
 .github/workflows/ci.yml      | 2 ++
 .github/workflows/release.yml | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 428d5a9..2554d7d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,6 +70,8 @@ jobs:
               done
       - name: Run Unit Tests
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
+        env:
+          UV_BREAK_SYSTEM_PACKAGES: true
         with:
           tox-env: py38,py39,py310,py311,py312,py313,py314,py315,py316
   final-status:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 72629bf..bd02c2c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -99,6 +99,8 @@ jobs:
               done
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
+        env:
+          UV_BREAK_SYSTEM_PACKAGES: true
         with:
           tox-env: package
       - name: Upload Artifact

From 5903eb4b1d7ebb43b46043176ed7e1723b8ceff9 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:12:41 -0700
Subject: [PATCH 04/16] Set the right env var.

---
 .github/workflows/ci.yml      | 2 +-
 .github/workflows/release.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2554d7d..00d493f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -71,7 +71,7 @@ jobs:
       - name: Run Unit Tests
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
         env:
-          UV_BREAK_SYSTEM_PACKAGES: true
+          PIP_BREAK_SYSTEM_PACKAGES: true
         with:
           tox-env: py38,py39,py310,py311,py312,py313,py314,py315,py316
   final-status:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index bd02c2c..0d2a99f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -100,7 +100,7 @@ jobs:
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
         env:
-          UV_BREAK_SYSTEM_PACKAGES: true
+          PIP_BREAK_SYSTEM_PACKAGES: true
         with:
           tox-env: package
       - name: Upload Artifact

From 550bbc7bfedf9f3473727131741d4d661d09c5cc Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:18:56 -0700
Subject: [PATCH 05/16] Try a Windows fix.

---
 .github/workflows/ci.yml      | 2 +-
 .github/workflows/release.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 00d493f..4aa978b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -64,7 +64,7 @@ jobs:
             --managed-python \
             --output-format json 2>/dev/null | \
               jq -r '.[] | .path' | \
-              grep uv-pythons/ | \
+              grep uv-pythons | \
               xargs dirname | while read entry; do
                 echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
               done
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0d2a99f..fcb1a0b 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -93,7 +93,7 @@ jobs:
             --output-format json \
             ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }} 2>/dev/null | \
               jq -r '.[] | .path' | \
-              grep uv-pythons/ | \
+              grep uv-pythons | \
               xargs dirname | while read entry; do
                 echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
               done

From ff06e74ea464e163a31ca36f6d79d1953d2b164e Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:28:52 -0700
Subject: [PATCH 06/16] Take another tack in CI.

---
 .github/workflows/ci.yml      | 62 ++++++++++++++++++++---------------
 .github/workflows/release.yml | 35 +++++++-------------
 2 files changed, 46 insertions(+), 51 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4aa978b..afb4284 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,14 +18,14 @@ jobs:
     steps:
       - name: Noop
         run: "true"
-  tests-36-37:
+  tests-36-38-and-316:
     name: (${{ matrix.os }}) Python ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }} Tests
     needs: org-check
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-24.04, macos-13]
-        python-version: [[3, 6, 15], [3, 7, 17]]
+        os: [ubuntu-24.04, macos-15]
+        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0-alpha.1"]]
     steps:
       - name: Checkout p537
         uses: actions/checkout@v5
@@ -40,8 +40,8 @@ jobs:
           command: pip install -U tox
       - name: Run Unit Tests
         run: tox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }}
-  tests-38-316:
-    name: (${{ matrix.os }}) Python 3.8 - 3.16 Tests
+  tests-39-315:
+    name: (${{ matrix.os }}) Python 3.9 - 3.15 Tests
     needs: org-check
     runs-on: ${{ matrix.os }}
     strategy:
@@ -50,35 +50,43 @@ jobs:
     steps:
       - name: Checkout p537
         uses: actions/checkout@v5
-      - name: Setup uv
-        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
+      - name: Setup Python 3.9
+        uses: actions/setup-python@v6
         with:
-          version: "0.13.1"
-      - name: Setup Pythons
-        shell: bash
-        run: |
-          export UV_PYTHON_INSTALL_DIR="${PWD}/uv-pythons"
-          uv python install --managed-python --force 3.{8..16}
-          uv python list \
-            --only-installed \
-            --managed-python \
-            --output-format json 2>/dev/null | \
-              jq -r '.[] | .path' | \
-              grep uv-pythons | \
-              xargs dirname | while read entry; do
-                echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
-              done
+          python-version: "3.9"
+      - name: Setup Python 3.10
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.10"
+      - name: Setup Python 3.11
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.11"
+      - name: Setup Python 3.12
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.12"
+      - name: Setup Python 3.13
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+      - name: Setup Python 3.14
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.14"
+      - name: Setup Python 3.15
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.15"
       - name: Run Unit Tests
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
-        env:
-          PIP_BREAK_SYSTEM_PACKAGES: true
         with:
-          tox-env: py38,py39,py310,py311,py312,py313,py314,py315,py316
+          tox-env: py39,py310,py311,py312,py313,py314,py315
   final-status:
     name: Gather Final Status
     needs:
-      - tests-36-37
-      - tests-38-316
+      - tests-36-38-and-316
+      - tests-39-315
     runs-on: ubuntu-24.04
     steps:
       - name: Check Non-Success
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index fcb1a0b..04cb10a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,14 +39,14 @@ jobs:
             echo "::error::Release tag '${RELEASE_TAG}' must match 'v\d+.\d+.\d+'."
             exit 1
           fi
-  package-36-37-dists:
+  package-36-38-and-316-dists:
     name: ${{ matrix.os }} Package for Python ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }}
     needs: determine-tag
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-24.04, macos-13]
-        python-version: [[3, 6, 15], [3, 7, 17]]
+        os: [ubuntu-24.04, macos-15]
+        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0-alpha.1"]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
         uses: actions/checkout@v5
@@ -69,38 +69,25 @@ jobs:
           name: "${{ matrix.os }}-${{ needs.determine-tag.outputs.release-tag }}-${{ join(matrix.python-version, '.') }}-distributions"
           path: dist/
           retention-days: 1
-  package-38-316-dists:
+  package-39-315-dists:
     name: ${{ matrix.os }} Package for Python ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }}
     needs: determine-tag
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-24.04, macos-13, windows-2025]
-        python-version: [[3, 8], [3, 9], [3, 10], [3, 11], [3, 12], [3, 13], [3, 14], [3, 15], [3, 16]]
+        os: [ubuntu-24.04, macos-15, windows-2025]
+        python-version: [[3, 9], [3, 10], [3, 11], [3, 12], [3, 13], [3, 14], [3, 15]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
         uses: actions/checkout@v5
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: Setup Python ${{ join(matrix.python-version, '.') }}
-        shell: bash
-        run: |
-          export UV_PYTHON_INSTALL_DIR="${PWD}/uv-pythons"
-          uv python install --managed-python --force ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }}
-          uv python list \
-            --only-installed \
-            --managed-python \
-            --output-format json \
-            ${{ matrix.python-version[0] }}.${{ matrix.python-version[1] }} 2>/dev/null | \
-              jq -r '.[] | .path' | \
-              grep uv-pythons | \
-              xargs dirname | while read entry; do
-                echo "$(realpath "${entry}")" >> "${GITHUB_PATH}"
-              done
+        uses: actions/setup-python@v6
+        with:
+          python-version: "${{ join(matrix.python-version, '.') }}"
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
         uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
-        env:
-          PIP_BREAK_SYSTEM_PACKAGES: true
         with:
           tox-env: package
       - name: Upload Artifact
@@ -113,8 +100,8 @@ jobs:
     name: Publish sdist and wheel to PyPI
     needs:
       - determine-tag
-      - package-36-37-dists
-      - package-38-316-dists
+      - package-36-38-and-316-dists
+      - package-39-315-dists
     runs-on: ubuntu-24.04
     environment: Release
     permissions:

From a877299019d9c72d549ffd25c93e5c9f40e28e44 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:30:18 -0700
Subject: [PATCH 07/16] Fix 3.16 pyenv version.

---
 .github/workflows/ci.yml      | 2 +-
 .github/workflows/release.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index afb4284..412d708 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-24.04, macos-15]
-        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0-alpha.1"]]
+        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0a1"]]
     steps:
       - name: Checkout p537
         uses: actions/checkout@v5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 04cb10a..35fcf72 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -46,7 +46,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-24.04, macos-15]
-        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0-alpha.1"]]
+        python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0a1"]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
         uses: actions/checkout@v5

From 0c8df1f8e186bbc4f4addb9add9aced25dc0bd5f Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:40:02 -0700
Subject: [PATCH 08/16] Upgrade pyenv to pick up 3.16.0a1.

---
 .github/workflows/ci.yml      | 5 ++---
 .github/workflows/release.yml | 5 ++---
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 412d708..f63ef34 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,9 +30,8 @@ jobs:
       - name: Checkout p537
         uses: actions/checkout@v5
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
-        # Upgrade node16 -> node20: Out for review here:
-        #   https://github.com/gabrielfalcao/pyenv-action/pull/444
-        uses: pex-tool/pyenv-action@baec18679698d2f80064cc04eb9ad0c8dc5ca8f8
+        # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
+        uses: pex-tool/pyenv-action@dd5f104be647704ba0eed246cbf0928becf39bb9
         env:
           ENSUREPIP: no
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 35fcf72..a52b6a3 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -53,9 +53,8 @@ jobs:
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
-        # Upgrade node16 -> node20: Out for review here:
-        #   https://github.com/gabrielfalcao/pyenv-action/pull/444
-        uses: pex-tool/pyenv-action@baec18679698d2f80064cc04eb9ad0c8dc5ca8f8
+        # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
+        uses: pex-tool/pyenv-action@dd5f104be647704ba0eed246cbf0928becf39bb9
         env:
           ENSUREPIP: no
         with:

From 0241f01151dbedf07595de140c9ecc6b5f9c888d Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:44:31 -0700
Subject: [PATCH 09/16] Another attempt at a pyenv upgrade.

---
 .github/workflows/ci.yml      | 2 +-
 .github/workflows/release.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f63ef34..7815f9c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v5
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
         # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
-        uses: pex-tool/pyenv-action@dd5f104be647704ba0eed246cbf0928becf39bb9
+        uses: pex-tool/pyenv-action@4742a5b7cb14532dbc845a6892035252f2e8b174
         env:
           ENSUREPIP: no
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a52b6a3..57b97fa 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -54,7 +54,7 @@ jobs:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
         # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
-        uses: pex-tool/pyenv-action@dd5f104be647704ba0eed246cbf0928becf39bb9
+        uses: pex-tool/pyenv-action@4742a5b7cb14532dbc845a6892035252f2e8b174
         env:
           ENSUREPIP: no
         with:

From cb70403a37054ae4032dbd849e14381e88462dcc Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Sun, 18 Oct 2026 17:48:00 -0700
Subject: [PATCH 10/16] Yet another attempt at a pyenv upgrade.

---
 .github/workflows/ci.yml      | 2 +-
 .github/workflows/release.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7815f9c..ce5deba 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v5
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
         # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
-        uses: pex-tool/pyenv-action@4742a5b7cb14532dbc845a6892035252f2e8b174
+        uses: pex-tool/pyenv-action@dcccfcc2bb18b008eca1ee92bbb05425e7126ead
         env:
           ENSUREPIP: no
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 57b97fa..fdc8a82 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -54,7 +54,7 @@ jobs:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
         # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
-        uses: pex-tool/pyenv-action@4742a5b7cb14532dbc845a6892035252f2e8b174
+        uses: pex-tool/pyenv-action@dcccfcc2bb18b008eca1ee92bbb05425e7126ead
         env:
           ENSUREPIP: no
         with:

From 445fe03bfa791ef70ea24cad5f6a62b3199f0f0e Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 19 Oct 2026 07:43:12 -0700
Subject: [PATCH 11/16] Fix Python build.

---
 .github/workflows/ci.yml      | 23 +++++++++++++++++++++++
 .github/workflows/release.yml | 23 +++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ce5deba..95de191 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,6 +29,29 @@ jobs:
     steps:
       - name: Checkout p537
         uses: actions/checkout@v5
+      - name: Install Python Build Requirements
+        run: |
+          apt update
+          DEBIAN_FRONTEND=noninteractive apt install \
+            --yes \
+            --no-install-recommends \
+                build-essential \
+                curl \
+                git \
+                libbz2-dev \
+                libffi-dev \
+                liblzma-dev \
+                libncursesw5-dev \
+                libreadline-dev \
+                libsqlite3-dev \
+                libssl-dev \
+                libxml2-dev \
+                libxmlsec1-dev \
+                libzstd-dev \
+                make \
+                tk-dev \
+                xz-utils \
+                zlib1g-dev
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
         # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
         uses: pex-tool/pyenv-action@dcccfcc2bb18b008eca1ee92bbb05425e7126ead
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index fdc8a82..0c0208a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -52,6 +52,29 @@ jobs:
         uses: actions/checkout@v5
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
+      - name: Install Python Build Requirements
+        run: |
+          apt update
+          DEBIAN_FRONTEND=noninteractive apt install \
+            --yes \
+            --no-install-recommends \
+                build-essential \
+                curl \
+                git \
+                libbz2-dev \
+                libffi-dev \
+                liblzma-dev \
+                libncursesw5-dev \
+                libreadline-dev \
+                libsqlite3-dev \
+                libssl-dev \
+                libxml2-dev \
+                libxmlsec1-dev \
+                libzstd-dev \
+                make \
+                tk-dev \
+                xz-utils \
+                zlib1g-dev
       - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
         # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
         uses: pex-tool/pyenv-action@dcccfcc2bb18b008eca1ee92bbb05425e7126ead

From 4c79114b1bcffea950d5e88dfe116c23fd4b73a8 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 19 Oct 2026 07:44:23 -0700
Subject: [PATCH 12/16] Fix perms.

---
 .github/workflows/ci.yml      | 4 ++--
 .github/workflows/release.yml | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95de191..9c69745 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,8 +31,8 @@ jobs:
         uses: actions/checkout@v5
       - name: Install Python Build Requirements
         run: |
-          apt update
-          DEBIAN_FRONTEND=noninteractive apt install \
+          sudo apt update
+          DEBIAN_FRONTEND=noninteractive sudo apt install \
             --yes \
             --no-install-recommends \
                 build-essential \
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 0c0208a..18b8adf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -54,8 +54,8 @@ jobs:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: Install Python Build Requirements
         run: |
-          apt update
-          DEBIAN_FRONTEND=noninteractive apt install \
+          sudo apt update
+          DEBIAN_FRONTEND=noninteractive sudo apt install \
             --yes \
             --no-install-recommends \
                 build-essential \

From 15cd86c300c6dd378a4acc8dfec57a36e1101ecb Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 19 Oct 2026 07:47:22 -0700
Subject: [PATCH 13/16] Limit apt to Ubuntu.

---
 .github/workflows/ci.yml      | 1 +
 .github/workflows/release.yml | 1 +
 2 files changed, 2 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9c69745..9b2e3e1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,6 +30,7 @@ jobs:
       - name: Checkout p537
         uses: actions/checkout@v5
       - name: Install Python Build Requirements
+        if: ${{ matrix.os == 'ubuntu-24.04' }}
         run: |
           sudo apt update
           DEBIAN_FRONTEND=noninteractive sudo apt install \
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 18b8adf..eba961d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -53,6 +53,7 @@ jobs:
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: Install Python Build Requirements
+        if: ${{ matrix.os == 'ubuntu-24.04' }}
         run: |
           sudo apt update
           DEBIAN_FRONTEND=noninteractive sudo apt install \

From 8548020f6b9526dbf7d292506f4b2eb9dc22a727 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 19 Oct 2026 11:55:32 -0700
Subject: [PATCH 14/16] Another swing at pyenv for 3.16.0a1.

---
 .github/workflows/actions.lock | 31 +++++++++++
 .github/workflows/ci.yml       | 94 +++++++++++++++++++---------------
 .github/workflows/release.yml  | 80 +++++++++++++++++------------
 3 files changed, 132 insertions(+), 73 deletions(-)
 create mode 100644 .github/workflows/actions.lock

diff --git a/.github/workflows/actions.lock b/.github/workflows/actions.lock
new file mode 100644
index 0000000..f42344f
--- /dev/null
+++ b/.github/workflows/actions.lock
@@ -0,0 +1,31 @@
+# This file is machine-generated by `gh actions-lock`.
+# Do not edit by hand; run `gh actions-lock` to update.
+# Docs: https://gh.io/actions-lockfile
+version: 'v0.0.3'
+workflows:
+    '.github/workflows/ci.yml':
+        - 'actions/checkout@v7.0.1'
+        - 'actions/setup-python@v7.0.0'
+        - 'pex-tool/actions@main'
+        - 'pex-tool/pyenv-action@main'
+dependencies:
+    'actions/checkout@v7.0.1':
+        ref: 'v7.0.1'
+        commit: 'sha1-3d3c42e5aac5ba805825da76410c181273ba90b1'
+        owner_id: 44036562
+        repo_id: 197814629
+    'actions/setup-python@v7.0.0':
+        ref: 'v7.0.0'
+        commit: 'sha1-5fda3b95a4ea91299a34e894583c3862153e4b97'
+        owner_id: 44036562
+        repo_id: 192625525
+    'pex-tool/actions@main':
+        ref: 'main'
+        commit: 'sha1-e22fe0e0fe85e1f7eb5bbfc7674c7cbbf24ae6b5'
+        owner_id: 159246247
+        repo_id: 891735357
+    'pex-tool/pyenv-action@main':
+        ref: 'main'
+        commit: 'sha1-dcccfcc2bb18b008eca1ee92bbb05425e7126ead'
+        owner_id: 159246247
+        repo_id: 759510979
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9b2e3e1..bf5d950 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,41 +28,55 @@ jobs:
         python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0a1"]]
     steps:
       - name: Checkout p537
-        uses: actions/checkout@v5
-      - name: Install Python Build Requirements
-        if: ${{ matrix.os == 'ubuntu-24.04' }}
+        uses: actions/checkout@v7.0.1
+      - name: Install Python Build Deps
+        if: matrix.os == 'ubuntu-24.04'
         run: |
           sudo apt update
-          DEBIAN_FRONTEND=noninteractive sudo apt install \
-            --yes \
-            --no-install-recommends \
-                build-essential \
-                curl \
-                git \
-                libbz2-dev \
-                libffi-dev \
-                liblzma-dev \
-                libncursesw5-dev \
-                libreadline-dev \
-                libsqlite3-dev \
-                libssl-dev \
-                libxml2-dev \
-                libxmlsec1-dev \
-                libzstd-dev \
-                make \
-                tk-dev \
-                xz-utils \
-                zlib1g-dev
-      - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
-        # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
-        uses: pex-tool/pyenv-action@dcccfcc2bb18b008eca1ee92bbb05425e7126ead
-        env:
-          ENSUREPIP: no
+          DEBIAN_FRONTEND=noninteractive sudo apt install -y \
+            build-essential \
+            curl \
+            git \
+            libbz2-dev \
+            libffi-dev \
+            liblzma-dev \
+            libncursesw5-dev \
+            libreadline-dev \
+            libsqlite3-dev \
+            libssl-dev \
+            libxml2-dev \
+            libxmlsec1-dev \
+            libzstd-dev \
+            make \
+            tk-dev \
+            xz-utils \
+            zlib1g-dev
+      - name: Install Pyenv
+        run: |
+          cd "${RUNNER_TOOL_CACHE}"
+          git clone https://github.com/pyenv/pyenv
+          (
+            cd pyenv
+            src/configure
+            make -C src
+          )
+          export PYENV_ROOT="$PWD/pyenv"
+          echo "PYENV_ROOT=${PYENV_ROOT}" >> "${GITHUB_ENV}"
+          echo "${PYENV_ROOT}/bin" >> "${GITHUB_PATH}"
+      - name: Setup Python ${{ join(matrix.python-version, '.') }}
+        run: |
+          pyenv install ${{ join(matrix.python-version, '.') }}
+          echo "${PYENV_ROOT}/versions/${{ join(matrix.python-version, '.') }}/bin" >> "${GITHUB_PATH}"
+      - name: Setup Tox Python
+        uses: actions/setup-python@v7.0.0
         with:
-          default: "${{ join(matrix.python-version, '.') }}"
-          command: pip install -U tox
+          python-version: 3.11
       - name: Run Unit Tests
-        run: tox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }}
+        run: |
+          python3.11 -V
+          python3.11 -mpip install -U pip
+          python3.11 -mpip install -U tox
+          python3.11 -mtox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }} -- -vvs
   tests-39-315:
     name: (${{ matrix.os }}) Python 3.9 - 3.15 Tests
     needs: org-check
@@ -72,37 +86,37 @@ jobs:
         os: [ubuntu-24.04, macos-15, windows-2025]
     steps:
       - name: Checkout p537
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7.0.1
       - name: Setup Python 3.9
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.9"
       - name: Setup Python 3.10
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.10"
       - name: Setup Python 3.11
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.11"
       - name: Setup Python 3.12
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.12"
       - name: Setup Python 3.13
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.13"
       - name: Setup Python 3.14
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.14"
       - name: Setup Python 3.15
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "3.15"
       - name: Run Unit Tests
-        uses: pex-tool/actions/run-tox@7d8530c74d2e3ca4640d1ed9192b6e2b8c4f5f7b
+        uses: pex-tool/actions/run-tox@main
         with:
           tox-env: py39,py310,py311,py312,py313,py314,py315
   final-status:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index eba961d..c79268e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -49,43 +49,57 @@ jobs:
         python-version: [[3, 6, 15], [3, 7, 17], [3, 8, 18], [3, 16, "0a1"]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7.0.1
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
-      - name: Install Python Build Requirements
-        if: ${{ matrix.os == 'ubuntu-24.04' }}
+      - name: Install Python Build Deps
+        if: matrix.os == 'ubuntu-24.04'
         run: |
           sudo apt update
-          DEBIAN_FRONTEND=noninteractive sudo apt install \
-            --yes \
-            --no-install-recommends \
-                build-essential \
-                curl \
-                git \
-                libbz2-dev \
-                libffi-dev \
-                liblzma-dev \
-                libncursesw5-dev \
-                libreadline-dev \
-                libsqlite3-dev \
-                libssl-dev \
-                libxml2-dev \
-                libxmlsec1-dev \
-                libzstd-dev \
-                make \
-                tk-dev \
-                xz-utils \
-                zlib1g-dev
-      - name: "Setup Python ${{ join(matrix.python-version, '.') }}"
-        # Upgrades pyenv to 2.8.10 to pick up 3.16.0a1.
-        uses: pex-tool/pyenv-action@dcccfcc2bb18b008eca1ee92bbb05425e7126ead
-        env:
-          ENSUREPIP: no
+          DEBIAN_FRONTEND=noninteractive sudo apt install -y \
+            build-essential \
+            curl \
+            git \
+            libbz2-dev \
+            libffi-dev \
+            liblzma-dev \
+            libncursesw5-dev \
+            libreadline-dev \
+            libsqlite3-dev \
+            libssl-dev \
+            libxml2-dev \
+            libxmlsec1-dev \
+            libzstd-dev \
+            make \
+            tk-dev \
+            xz-utils \
+            zlib1g-dev
+      - name: Install Pyenv
+        run: |
+          cd "${RUNNER_TOOL_CACHE}"
+          git clone https://github.com/pyenv/pyenv
+          (
+            cd pyenv
+            src/configure
+            make -C src
+          )
+          export PYENV_ROOT="$PWD/pyenv"
+          echo "PYENV_ROOT=${PYENV_ROOT}" >> "${GITHUB_ENV}"
+          echo "${PYENV_ROOT}/bin" >> "${GITHUB_PATH}"
+      - name: Setup Python ${{ join(matrix.python-version, '.') }}
+        run: |
+          pyenv install ${{ join(matrix.python-version, '.') }}
+          echo "${PYENV_ROOT}/versions/${{ join(matrix.python-version, '.') }}/bin" >> "${GITHUB_PATH}"
+      - name: Setup Tox Python
+        uses: actions/setup-python@v7.0.0
         with:
-          default: "${{ join(matrix.python-version, '.') }}"
-          command: pip install -U tox
+          python-version: 3.11
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
-        run: tox -e package
+        run: |
+          python3.11 -V
+          python3.11 -mpip install -U pip
+          python3.11 -mpip install -U tox
+          python3.11 -mtox -e package
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with:
@@ -102,11 +116,11 @@ jobs:
         python-version: [[3, 9], [3, 10], [3, 11], [3, 12], [3, 13], [3, 14], [3, 15]]
     steps:
       - name: Checkout p537 ${{ needs.determine-tag.outputs.release-tag }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v7.0.1
         with:
           ref: ${{ needs.determine-tag.outputs.release-tag }}
       - name: Setup Python ${{ join(matrix.python-version, '.') }}
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7.0.0
         with:
           python-version: "${{ join(matrix.python-version, '.') }}"
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}

From 480c006a1a21f0692bfc397bc0064ceecdc05466 Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 19 Oct 2026 12:01:11 -0700
Subject: [PATCH 15/16] Try running tox under 3.9 insteal of 3.11.

---
 .github/workflows/ci.yml      | 10 +++++-----
 .github/workflows/release.yml | 10 +++++-----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bf5d950..6cb168f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,13 +70,13 @@ jobs:
       - name: Setup Tox Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: 3.11
+          python-version: 3.9
       - name: Run Unit Tests
         run: |
-          python3.11 -V
-          python3.11 -mpip install -U pip
-          python3.11 -mpip install -U tox
-          python3.11 -mtox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }} -- -vvs
+          python3.9 -V
+          python3.9 -mpip install -U pip
+          python3.9 -mpip install -U tox
+          python3.9 -mtox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }} -- -vvs
   tests-39-315:
     name: (${{ matrix.os }}) Python 3.9 - 3.15 Tests
     needs: org-check
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c79268e..525e4a7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -93,13 +93,13 @@ jobs:
       - name: Setup Tox Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: 3.11
+          python-version: 3.9
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
         run: |
-          python3.11 -V
-          python3.11 -mpip install -U pip
-          python3.11 -mpip install -U tox
-          python3.11 -mtox -e package
+          python3.9 -V
+          python3.9 -mpip install -U pip
+          python3.9 -mpip install -U tox
+          python3.9 -mtox -e package
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with:

From 753ffcd85d6621897d771da670b25c32bc7f91db Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 19 Oct 2026 12:07:19 -0700
Subject: [PATCH 16/16] Back to 3.11, constrain tox.ini instead.

---
 .github/workflows/ci.yml      | 10 +++++-----
 .github/workflows/release.yml | 10 +++++-----
 tox.ini                       | 11 +++++++++--
 3 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6cb168f..bf5d950 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,13 +70,13 @@ jobs:
       - name: Setup Tox Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: 3.9
+          python-version: 3.11
       - name: Run Unit Tests
         run: |
-          python3.9 -V
-          python3.9 -mpip install -U pip
-          python3.9 -mpip install -U tox
-          python3.9 -mtox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }} -- -vvs
+          python3.11 -V
+          python3.11 -mpip install -U pip
+          python3.11 -mpip install -U tox
+          python3.11 -mtox -e py${{ matrix.python-version[0] }}${{ matrix.python-version[1] }} -- -vvs
   tests-39-315:
     name: (${{ matrix.os }}) Python 3.9 - 3.15 Tests
     needs: org-check
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 525e4a7..c79268e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -93,13 +93,13 @@ jobs:
       - name: Setup Tox Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: 3.9
+          python-version: 3.11
       - name: Package ${{ needs.determine-tag.outputs.release-tag }}
         run: |
-          python3.9 -V
-          python3.9 -mpip install -U pip
-          python3.9 -mpip install -U tox
-          python3.9 -mtox -e package
+          python3.11 -V
+          python3.11 -mpip install -U pip
+          python3.11 -mpip install -U tox
+          python3.11 -mtox -e package
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with:
diff --git a/tox.ini b/tox.ini
index 0138691..a9f6afe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,8 @@
 [tox]
 minversion = 3.26.0
 isolated_build = true
-skip_missing_interpreters = True
+skip_missing_interpreters = true
+
 envlist =
     py36
     py37
@@ -16,8 +17,14 @@ envlist =
     py316
 
 [testenv]
+# We need newer Pip to operate under Python 3.14.
+download = true
+
 deps =
-    pytest
+    pytest==6.2.5; python_version == "3.6"
+    pytest==7.4.4; python_version == "3.7"
+    pytest==8.3.3; python_version >= "3.8"
+
 commands = pytest -vs
 
 [testenv:package]