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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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FAQ</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="development/reviews.html">Reviewing Code</a></li><li class="chapter-item expanded "><a href="development/releases.html">Release Cycle</a></li><li class="chapter-item expanded "><a href="development/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/demo.html">Demo scripts</a></li></ol></li><li class="chapter-item expanded "><a href="opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><a href="development/database_schema.html">Database Schemas</a></li><li class="chapter-item 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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, Rust,
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PostgreSQL and SQLite. This document outlines the policy towards which versions
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we support, and when we 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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<p>A Rust compiler is required to build Synapse from source. For any given release
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the minimum required version may be bumped up to a recent Rust version, and so
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people building from source should ensure they can fetch recent versions of Rust
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(e.g. by using <a href="https://rustup.rs/">rustup</a>).</p>
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<p>The oldest supported version of SQLite is the version
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<a href="https://packages.debian.org/buster/libsqlite3-0">provided</a> by
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<a href="https://wiki.debian.org/DebianOldStable">Debian oldstable</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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<p>For Rust, the situation is a bit different given that a) the Rust foundation
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does not generally support older Rust versions, and b) the library ecosystem
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generally bump their minimum support Rust versions frequently. In general, the
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Synapse team will try to avoid updating the dependency on Rust to the absolute
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latest version, but introducing a formal policy is hard given the constraints of
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the ecosystem.</p>
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<p>On a similar note, SQLite does not generally have a concept of "supported
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release"; bugfixes are published for the latest minor release only. We chose to
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track Debian's oldstable as this is relatively conservative, predictably updated
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and is consistent with the <code>.deb</code> packages released by Matrix.org.</p>
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