Dropped Python 3.9 support:

  - pyproject.toml: requires-python changed to >=3.10, removed 3.9 classifier, cleaned up all
  python_version < '3.10' / python_version >= '3.10' conditional dependencies (coverage, click,
  numpy, orjson, polars, pytest, pytest-cov, python-dotenv)
  - .github/workflows/main.yaml: Removed 3.9 from matrix, added 3.14, changed DEFAULT_PYTHON and
  all conditional checks from 3.12 to 3.14
  - noxfile.py: Removed 3.9, added 3.14 to pytest session
  - README.md: Updated to "Python 3.10+" and added "Dropping support for Python 3.9" to What is
  New
  - CLAUDE.md: Updated to "3.10+"
  - .github/ISSUE_TEMPLATE/bug_report.md: Updated example version from 3.9.12 to 3.10.12

  Changelog/docs updates:
  - CHANGELOG.md: Added "Dropping support for Python 3.9" to v8-7-0
  - docs/changelog.rst: Added "Dropping support for Python 3.9" to v8-7-0
  - docs/index.rst: Added new 8-7-0 section with all its entries (matching the pattern of
  existing version sections)

Author: seperman

.github/ISSUE_TEMPLATE/bug_report.md

@@ -21,7 +21,7 @@ A clear and concise description of what you expected to happen.
 **OS, DeepDiff version and Python version (please complete the following information):**
  - OS: [e.g. Ubuntu]
  - Version [e.g. 20LTS]
- - Python Version [e.g. 3.9.12]
+ - Python Version [e.g. 3.10.12]
  - DeepDiff Version [e.g. 5.8.0]
 
 **Additional context**

.github/workflows/main.yaml

@@ -8,10 +8,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      DEFAULT_PYTHON: '3.12'
+      DEFAULT_PYTHON: '3.14'
     strategy:
       matrix:
-        python-version: ['3.9','3.10','3.11','3.12','3.13']
+        python-version: ['3.10','3.11','3.12','3.13','3.14']
         architecture: ['x64']
 
     steps:
@@ -29,18 +29,18 @@ jobs:
         run: pip install nox==2025.5.1
 
       - name: Lint with flake8
-        if: ${{ matrix.python-version == '3.12' }}
+        if: ${{ matrix.python-version == '3.14' }}
         run: |
           nox -s flake8 -- deepdiff --count --select=E9,F63,F7,F82 --show-source --statistics
           nox -s flake8 -- deepdiff --count --exit-zero --max-complexity=26 --max-line-length=250 --statistics
 
       - name: Test with pytest (no coverage)
-        if: ${{ matrix.python-version != '3.12' }}
+        if: ${{ matrix.python-version != '3.14' }}
         run: |
           nox -s pytest-${{ matrix.python-version }} -- --benchmark-disable tests/
 
       - name: Test with pytest (+ coverage)
-        if: ${{ matrix.python-version == '3.12' }}
+        if: ${{ matrix.python-version == '3.14' }}
         run: |
           nox -s pytest-${{ matrix.python-version }} -- \
             --benchmark-disable \
@@ -49,7 +49,7 @@ jobs:
             tests/ --runslow
 
       - name: Upload coverage
-        if: ${{ matrix.python-version == '3.12' }}
+        if: ${{ matrix.python-version == '3.14' }}
         uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}

CHANGELOG.md

@@ -1,6 +1,7 @@
 # DeepDiff Change log
 
 - v8-7-0
+    - Dropping support for Python 3.9
     - Support for python 3.14
     - `to_dict()` and `to_json()` now accept a `verbose_level` parameter and always return a usable text-view dict. When the original view is `'tree'`, they default to `verbose_level=2` for full detail. The old `view_override` parameter is removed.
 

CLAUDE.md

@@ -101,7 +101,7 @@ nox
 
 ## Development Notes
 
-- **Python Support**: 3.9+ and PyPy3
+- **Python Support**: 3.10+ and PyPy3
 - **Main Branch**: `master` (PRs typically go to `dev` branch)
 - **Build System**: Modern `pyproject.toml` with `flit_core`
 - **Dependencies**: Core dependency is `orderly-set>=5.4.1,<6`

README.md

@@ -15,7 +15,7 @@
 - [Extract](https://zepworks.com/deepdiff/current/extract.html): Extract an item from a nested Python object using its path.
 - [commandline](https://zepworks.com/deepdiff/current/commandline.html): Use DeepDiff from commandline.
 
-Tested on Python 3.9+ and PyPy3.
+Tested on Python 3.10+ and PyPy3.
 
 - **[Documentation](https://zepworks.com/deepdiff/8.7.0/)**
 
@@ -24,7 +24,8 @@ Tested on Python 3.9+ and PyPy3.
 Please check the [ChangeLog](CHANGELOG.md) file for the detailed information.
 
 DeepDiff 8-7-0
-- support for python 3.14
+- Dropping support for Python 3.9
+- Support for python 3.14
 - `to_dict()` and `to_json()` now accept a `verbose_level` parameter and always return a usable text-view dict. When the original view is `'tree'`, they default to `verbose_level=2` for full detail. The old `view_override` parameter is removed.
 
 DeepDiff 8-6-1

docs/changelog.rst

@@ -6,6 +6,7 @@ Changelog
 DeepDiff Changelog
 
 - v8-7-0
+   - Dropping support for Python 3.9
    - Support for python 3.14
    - ``to_dict()`` and ``to_json()`` now accept a ``verbose_level`` parameter and always return a usable text-view dict. When the original view is ``'tree'``, they default to ``verbose_level=2`` for full detail. The old ``view_override`` parameter is removed.
 

docs/index.rst

@@ -31,6 +31,14 @@ The DeepDiff library includes the following modules:
 What Is New
 ***********
 
+DeepDiff 8-7-0
+--------------
+
+   - Dropping support for Python 3.9
+   - Support for python 3.14
+   - ``to_dict()`` and ``to_json()`` now accept a ``verbose_level`` parameter and always return a usable text-view dict. When the original view is ``'tree'``, they default to ``verbose_level=2`` for full detail. The old ``view_override`` parameter is removed.
+
+
 DeepDiff 8-6-1
 --------------
 

noxfile.py

@@ -33,7 +33,7 @@ def mypy(session) -> None:
     )
 
 
-@nox.session(python=["3.9", "3.10", "3.11", "3.12", "3.13"])
+@nox.session(python=["3.10", "3.11", "3.12", "3.13", "3.14"])
 def pytest(session) -> None:
     """Test with pytest."""
     posargs = session.posargs if session.posargs else ["-vv", "tests"]

pyproject.toml

@@ -8,7 +8,7 @@ version = "8.7.0"
 dependencies = [
   "orderly-set>=5.4.1,<6",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [
   { name = "Seperman", email = "sep@zepworks.com" }
 ]
@@ -23,7 +23,6 @@ classifiers = [
   "Intended Audience :: Developers",
   "Operating System :: OS Independent",
   "Topic :: Software Development",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -37,28 +36,25 @@ classifiers = [
 # `dependency-groups` would make this a lot cleaner, in theory.
 [project.optional-dependencies]
 coverage = [
-  "coverage~=7.13.4; python_version >= '3.10'",
-  "coverage~=7.10.7; python_version < '3.10'"
+  "coverage~=7.13.4",
 ]
 cli = [
-  "click~=8.3.1; python_version >= '3.10'",
-  "click~=8.1.7; python_version < '3.10'",
+  "click~=8.3.1",
   "pyyaml~=6.0.3"
 ]
 dev = [
   "bump2version~=1.0.1",
   "jsonpickle~=4.1.1",
   "ipdb~=0.13.13",
   "numpy~=2.4.3; python_version >= '3.14'",
-  "numpy~=2.2.0; python_version < '3.14' and python_version >= '3.10'",
-  "numpy~=2.0; python_version < '3.10'",
+  "numpy~=2.2.0; python_version < '3.14'",
   "python-dateutil~=2.9.0.post0",
-  "orjson~=3.11.7; python_version >= '3.10'",
+  "orjson~=3.11.7",
   "tomli~=2.4.0",
   "tomli-w~=1.2.0",
   "pandas~=3.0.1; python_version >= '3.11'",
   "pandas~=2.2.0; python_version < '3.11'",
-  "polars~=1.38.1; python_version >= '3.10'",
+  "polars~=1.38.1",
   "nox==2026.2.9",
   "uuid6==2025.0.1",
   "pytz",
@@ -75,13 +71,10 @@ static = [
   "pydantic~=2.12.5",
 ]
 test = [
-  "pytest~=9.0.2; python_version >= '3.10'",
-  "pytest~=8.3.4; python_version < '3.10'",
+  "pytest~=9.0.2",
   "pytest-benchmark~=5.2.3",
-  "pytest-cov~=7.0.0; python_version >= '3.10'",
-  "pytest-cov~=6.0.0; python_version < '3.10'",
-  "python-dotenv~=1.2.2; python_version >= '3.10'",
-  "python-dotenv~=1.0.1; python_version < '3.10'",
+  "pytest-cov~=7.0.0",
+  "python-dotenv~=1.2.2",
 ]
 optimize = [
   "orjson",