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<section id="dependency-version-policy">
<span id="min-deps-policy"></span><h1>Dependency version policy<a class="headerlink" href="#dependency-version-policy" title="Link to this heading">#</a></h1>
<p>For the purpose of this document, 'minor version' is in the sense of
SemVer (major, minor, patch) and includes both major and minor
releases. For projects that use date-based versioning, every release
is a 'minor version'.</p>
<p>Matplotlib follows <a class="reference external" href="https://numpy.org/neps/nep-0029-deprecation_policy.html">NEP 29</a>.</p>
<section id="python-and-numpy">
<h2>Python and NumPy<a class="headerlink" href="#python-and-numpy" title="Link to this heading">#</a></h2>
<p>Matplotlib supports:</p>
<ul class="simple">
<li><p>All minor versions of Python released 42 months prior to the
project, and at minimum the two latest minor versions.</p></li>
<li><p>All minor versions of <code class="docutils literal notranslate"><span class="pre">numpy</span></code> released in the 24 months prior
to the project, and at minimum the last three minor versions.</p></li>
</ul>
<p>In <code class="docutils literal notranslate"><span class="pre">setup.py</span></code>, the <code class="docutils literal notranslate"><span class="pre">python_requires</span></code> variable should be set to
the minimum supported version of Python. All supported minor
versions of Python should be in the test matrix and have binary
artifacts built for the release.</p>
<p>Minimum Python and NumPy version support should be adjusted upward
on every major and minor release, but never on a patch release.</p>
<p>See also the <a class="reference internal" href="#list-of-dependency-min-versions"><span class="std std-ref">List of dependency versions</span></a>.</p>
</section>
<section id="python-dependencies">
<h2>Python dependencies<a class="headerlink" href="#python-dependencies" title="Link to this heading">#</a></h2>
<p>For Python dependencies we should support at least:</p>
<dl class="simple">
<dt>with compiled extensions</dt><dd><p>minor versions initially released in the 24 months prior to our planned
release date or the oldest that support our minimum Python + NumPy</p>
</dd>
<dt>without compiled extensions</dt><dd><p>minor versions initially released in the 12 months prior to our planned
release date or the oldest that supports our minimum Python.</p>
</dd>
</dl>
<p>We will only bump these dependencies as we need new features or the old
versions no longer support our minimum NumPy or Python.</p>
</section>
<section id="test-and-documentation-dependencies">
<h2>Test and documentation dependencies<a class="headerlink" href="#test-and-documentation-dependencies" title="Link to this heading">#</a></h2>
<p>As these packages are only needed for testing or building the docs and
not needed by end-users, we can be more aggressive about dropping
support for old versions. However, we need to be careful to not
over-run what down-stream packagers support (as most of the run the
tests and build the documentation as part of the packaging process).</p>
<p>We will support at least minor versions of the development
dependencies released in the 12 months prior to our planned release.</p>
<p>We will only bump these as needed or versions no longer support our
minimum Python and NumPy.</p>
</section>
<section id="system-and-c-dependencies">
<h2>System and C-dependencies<a class="headerlink" href="#system-and-c-dependencies" title="Link to this heading">#</a></h2>
<p>For system or C-dependencies (FreeType, GUI frameworks, LaTeX,
Ghostscript, FFmpeg) support as old as practical. These can be difficult to
install for end-users and we want to be usable on as many systems as
possible. We will bump these on a case-by-case basis.</p>
<p>In the case of GUI frameworks for which we rely on Python bindings being
available, we will also drop support for bindings so old that they don't
support any Python version that we support.</p>
</section>
<section id="list-of-dependency-versions">
<span id="list-of-dependency-min-versions"></span><h2>List of dependency versions<a class="headerlink" href="#list-of-dependency-versions" title="Link to this heading">#</a></h2>
<p>The following list shows the minimal versions of Python and NumPy dependencies
for different versions of Matplotlib. Follow the links for the full
specification of the dependencies.</p>
<table class="table">
<thead>
<tr class="row-odd"><th class="head"><p>Matplotlib</p></th>
<th class="head"><p>Python</p></th>
<th class="head"><p>NumPy</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/3.8.0/devel/dependencies.html">3.8</a></p></td>
<td><p>3.9</p></td>
<td><p>1.21.0</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/3.7.0/devel/dependencies.html">3.7</a></p></td>
<td><p>3.8</p></td>
<td><p>1.20.0</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/3.6.0/devel/dependencies.html">3.6</a></p></td>
<td><p>3.8</p></td>
<td><p>1.19.0</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/3.5.0/devel/dependencies.html">3.5</a></p></td>
<td><p>3.7</p></td>
<td><p>1.17.0</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/3.4.0/devel/dependencies.html">3.4</a></p></td>
<td><p>3.7</p></td>
<td><p>1.16.0</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/3.3.0/users/installing.html#dependencies">3.3</a></p></td>
<td><p>3.6</p></td>
<td><p>1.15.0</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/3.2.0/users/installing.html#dependencies">3.2</a></p></td>
<td><p>3.6</p></td>
<td><p>1.11.0</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/3.1.0/users/installing.html#dependencies">3.1</a></p></td>
<td><p>3.6</p></td>
<td><p>1.11.0</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/3.0.0/users/installing.html#dependencies">3.0</a></p></td>
<td><p>3.5</p></td>
<td><p>1.10.0</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/2.2.0/users/installing.html#dependencies">2.2</a></p></td>
<td><p>2.7, 3.4</p></td>
<td><p>1.7.1</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/2.1.0/users/installing.html#dependencies">2.1</a></p></td>
<td><p>2.7, 3.4</p></td>
<td><p>1.7.1</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/2.0.0/users/installing.html#required-dependencies">2.0</a></p></td>
<td><p>2.7, 3.4</p></td>
<td><p>1.7.1</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/1.5.0/users/installing.html#required-dependencies">1.5</a></p></td>
<td><p>2.7, 3.4</p></td>
<td><p>1.6</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference external" href="https://matplotlib.org/1.4.0/users/installing.html#required-dependencies">1.4</a></p></td>
<td><p>2.6, 3.3</p></td>
<td><p>1.6</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference external" href="https://matplotlib.org/1.3.0/users/installing.html#build-requirements">1.3</a></p></td>
<td><p>2.6, 3.3</p></td>
<td><p>1.5</p></td>
</tr>
<tr class="row-odd"><td><p>1.2</p></td>
<td><p>2.6, 3.1</p></td>
<td><p>1.4</p></td>
</tr>
<tr class="row-even"><td><p>1.1</p></td>
<td><p>2.4</p></td>
<td><p>1.1</p></td>
</tr>
<tr class="row-odd"><td><p>1.0</p></td>
<td><p>2.4</p></td>
<td><p>1.1</p></td>
</tr>
</tbody>
</table>
</section>
</section>
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