PYTHON-6138 Drop Python 3.9 and 3.10 Support

.evergreen/scripts/generate_config_utils.py

@@ -22,9 +22,9 @@
 ##############
 
 ALL_VERSIONS = ["4.4", "5.0", "6.0", "7.0", "8.0", "9.0", "rapid", "latest"]
-CPYTHONS = ["3.10", "3.11", "3.12", "3.13", "3.14t", "3.14", "3.15t", "3.15"]
+CPYTHONS = ["3.11", "3.12", "3.13", "3.14t", "3.14", "3.15t", "3.15"]
 PYPYS = ["pypy3.11"]
-MIN_SUPPORT_VERSIONS = ["3.9", "pypy3.9", "pypy3.10"]
+MIN_SUPPORT_VERSIONS = ["3.11"]
 ALL_PYTHONS = CPYTHONS + PYPYS
 MIN_MAX_PYTHON = [CPYTHONS[0], CPYTHONS[-1]]
 BATCHTIME_WEEK = 10080

.evergreen/scripts/setup-uv-python.sh

@@ -2,7 +2,7 @@
 # Choose the Python that uv uses, and make sure uv can provide it.
 #
 # Input:
-#   UV_PYTHON - a version ("3.10", "3.14t"), an implementation ("pypy3.11"),
+#   UV_PYTHON - a version ("3.11", "3.14t"), an implementation ("pypy3.11"),
 #               or an interpreter path ("/usr/bin/python3.11").
 #
 # Exports:
@@ -11,7 +11,7 @@
 #   UV_PYTHON_PREFERENCE  - "system" so the toolchain wins over managed installs.
 #                           A preference set by the task is left alone.
 #   UV_PYTHON             - the Python interpreter uv uses; defaults to CPython
-#                           3.10 when the task does not set one.
+#                           3.11 when the task does not set one.
 set -euo pipefail
 
 HERE=$(dirname "${BASH_SOURCE:-$0}")
@@ -46,9 +46,9 @@ fi
 # Default to a known-good Python so behavior is deterministic when a task does
 # not pin one. Selecting the uv binary is separate and driven by the required
 # uv version in pyproject.toml.
-export UV_PYTHON="${UV_PYTHON:-3.10}"
+export UV_PYTHON="${UV_PYTHON:-3.11}"
 
-# Print the Python toolchain bin dir for a version like "3.10" or "3.14t".
+# Print the Python toolchain bin dir for a version like "3.11" or "3.14t".
 function _toolchain_dir() {
   local version="$1" dir
   # Only plain CPython versions live in the toolchain.

.evergreen/scripts/utils.py

@@ -86,7 +86,7 @@ class Distro:
 EXTRA_TESTS = ["aws_lambda", "doctest"]
 
 # The managed Python version used for perf tests (PYTHON-6135).
-PERF_PYTHON_VERSION = "3.10.11"
+PERF_PYTHON_VERSION = "3.11.9"
 
 # Tests that do not use run-mongodb directly.
 NO_RUN_ORCHESTRATION = [

.github/workflows/dist.yml

@@ -86,8 +86,6 @@ jobs:
       - name: Assert all versions in wheelhouse
         if: ${{ ! startsWith(matrix.buildplat[1], 'macos') }}
         run: |
-          ls wheelhouse/*cp39*.whl
-          ls wheelhouse/*cp310*.whl
           ls wheelhouse/*cp311*.whl
           ls wheelhouse/*cp312*.whl
           ls wheelhouse/*cp313*.whl
@@ -118,7 +116,7 @@ jobs:
       - uses: actions/setup-python@v7.0.0
         with:
           # Build sdist on lowest supported Python
-          python-version: "3.9"
+          python-version: "3.11"
 
       - name: Build SDist
         run: |

.github/workflows/sbom.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7.0.0
         with:
-          python-version: "3.10"
+          python-version: "3.11"
 
       - name: Generate SBOM
         run: |

.github/workflows/test-python.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Install Python tooling
         uses: mongodb-labs/drivers-github-tools/python/setup@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       # Runs before the install so a stale lock fails in seconds rather than
       # after the build and typecheck.
       - name: Check lockfile is up to date
@@ -71,7 +71,7 @@ jobs:
       matrix:
         # Tests currently only pass on ubuntu on GitHub Actions.
         os: [ubuntu-latest]
-        python-version: ["3.10", "3.13t", "3.15"]
+        python-version: ["3.11", "3.13t", "3.15"]
         mongodb-version: ["8.0"]
 
     name: Python ${{ matrix.python-version }}-${{ matrix.os }}
@@ -105,7 +105,7 @@ jobs:
       - name: Install Python tooling
         uses: mongodb-labs/drivers-github-tools/python/setup@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - id: setup-mongodb
         uses: mongodb-labs/drivers-evergreen-tools@354a81692bfd2b654a38277b681d248507d17800 # v1.2.0
         with:
@@ -131,7 +131,7 @@ jobs:
       - name: Install Python tooling
         uses: mongodb-labs/drivers-github-tools/python/setup@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - name: Install dependencies
         run: just install
       - id: setup-mongodb
@@ -153,7 +153,7 @@ jobs:
       - name: Install Python tooling
         uses: mongodb-labs/drivers-github-tools/python/setup@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - name: Install dependencies
         run: just install
       - name: Build docs
@@ -164,7 +164,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ["3.10", "3.11"]
+        python: ["3.11"]
     steps:
       - uses: actions/checkout@v7.0.1
         with:
@@ -190,7 +190,7 @@ jobs:
       - name: Install Python tooling
         uses: mongodb-labs/drivers-github-tools/python/setup@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - name: Install dependencies
         run: just install
       - id: setup-mongodb
@@ -218,7 +218,7 @@ jobs:
           cache: 'pip'
           cache-dependency-path: 'pyproject.toml'
           # Build sdist on lowest supported Python
-          python-version: "3.9"
+          python-version: "3.11"
       - name: Build SDist
         shell: bash
         run: |
@@ -252,7 +252,7 @@ jobs:
             cache: 'pip'
             cache-dependency-path: 'sdist/test/pyproject.toml'
             # Test sdist on lowest supported Python
-            python-version: "3.9"
+            python-version: "3.11"
         - id: setup-mongodb
           uses: mongodb-labs/drivers-evergreen-tools@354a81692bfd2b654a38277b681d248507d17800 # v1.2.0
         - name: Run connect test from sdist
@@ -276,7 +276,7 @@ jobs:
         - name: Install Python tooling
           uses: mongodb-labs/drivers-github-tools/python/setup@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
           with:
-            python-version: "3.9"
+            python-version: "3.11"
         - id: setup-mongodb
           uses: mongodb-labs/drivers-evergreen-tools@354a81692bfd2b654a38277b681d248507d17800 # v1.2.0
           with:

.github/workflows/uv-lock-update.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@c18668ad3cf93ea998bef934396af7bb5c839dc7 # v10.2.0
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - uses: mongodb-labs/drivers-github-tools/python/uv-lock-update@4089c3eb27d7a5101d987088c3345013858d65f8  # v3.0.6
         with:
           app_id: ${{ vars.APP_ID }}

CONTRIBUTING.md

@@ -16,7 +16,7 @@ be of interest or that has already been addressed.
 
 ## Supported Interpreters
 
-PyMongo supports CPython 3.9+ and PyPy3.9+. Language features not
+PyMongo supports CPython 3.11+ and PyPy 3.11+. Language features not
 supported by all interpreters can not be used.
 
 ## Style Guide

README.md

@@ -98,7 +98,7 @@ package that is incompatible with PyMongo.
 
 ## Dependencies
 
-PyMongo supports CPython 3.9+ and PyPy3.9+. PyPy support is deprecated and will be removed in a future release.
+PyMongo supports CPython 3.11+ and PyPy3.11+. PyPy support is deprecated and will be removed in a future release.
 
 Required dependencies:
 

doc/changelog.rst

@@ -6,7 +6,11 @@ Changes in Version 4.19.0 (2026/XX/XX)
 
 PyMongo 4.19 brings a number of changes including:
 
+.. warning:: PyMongo 4.19 drops support for Python 3.9 and 3.10 and PyPy 3.9
+  and 3.10: Python 3.11+ or PyPy 3.11+ is now required.
+
 - Added support for Python 3.15.
+- Dropped support for Python 3.9 and 3.10 and PyPy 3.9 and 3.10 (PYTHON-6138).
 - Added support for running the synchronous and asynchronous clients in
   subinterpreters, including inside
   ``concurrent.futures.InterpreterPoolExecutor`` (Python 3.14+). Only in

pyproject.toml

@@ -9,7 +9,7 @@ description = "PyMongo - the Official MongoDB Python driver"
 readme = "README.md"
 license = "Apache-2.0"
 license-files = ["LICENSE"]
-requires-python = ">=3.9"
+requires-python = ">=3.11"
 authors = [
     { name = "The MongoDB Python Team" },
 ]
@@ -30,8 +30,6 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: PyPy",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
@@ -56,11 +54,6 @@ required-version = "==0.12.12"
 # Skip dependency releases newer than 7 days. Defining it here keeps every uv
 # invocation on the same cutoff.
 exclude-newer = "7 days"
-# boto3 dropped Python 3.9 support in 1.43, so the universal lock forks at
-# 3.10. Without a floor the pre-3.10 fork back-solves to boto3 1.7.84 (2018),
-# whose vendored six and invalid escape sequences break test collection. No
-# AWS task runs on 3.9; this keeps both forks on current releases.
-constraint-dependencies = ["boto3>=1.34"]
 
 [dependency-groups]
 dev = []