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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrade.html">Upgrading between Synapse 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affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html" class="active">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol>
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<h1 id="deprecation-policy-for-platform-dependencies"><a class="header" href="#deprecation-policy-for-platform-dependencies">Deprecation Policy for Platform Dependencies</a></h1>
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<p>Synapse has a number of platform dependencies, including Python and PostgreSQL.
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This document outlines the policy towards which versions we support, and when we
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drop support for versions in the future.</p>
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<h2 id="policy"><a class="header" href="#policy">Policy</a></h2>
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<p>Synapse follows the upstream support life cycles for Python and PostgreSQL,
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i.e. when a version reaches End of Life Synapse will withdraw support for that
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version in future releases.</p>
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<p>Details on the upstream support life cycles for Python and PostgreSQL are
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documented at <a href="https://endoflife.date/python">https://endoflife.date/python</a> and
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<a href="https://endoflife.date/postgresql">https://endoflife.date/postgresql</a>.</p>
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<h2 id="context"><a class="header" href="#context">Context</a></h2>
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<p>It is important for system admins to have a clear understanding of the platform
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requirements of Synapse and its deprecation policies so that they can
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effectively plan upgrading their infrastructure ahead of time. This is
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especially important in contexts where upgrading the infrastructure requires
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auditing and approval from a security team, or where otherwise upgrading is a
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long process.</p>
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<p>By following the upstream support life cycles Synapse can ensure that its
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dependencies continue to get security patches, while not requiring system admins
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to constantly update their platform dependencies to the latest versions.</p>
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