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  149. <h1 id="deprecation-policy-for-platform-dependencies"><a class="header" href="#deprecation-policy-for-platform-dependencies">Deprecation Policy for Platform Dependencies</a></h1>
  150. <p>Synapse has a number of platform dependencies, including Python, Rust,
  151. PostgreSQL and SQLite. This document outlines the policy towards which versions
  152. we support, and when we drop support for versions in the future.</p>
  153. <h2 id="policy"><a class="header" href="#policy">Policy</a></h2>
  154. <p>Synapse follows the upstream support life cycles for Python and PostgreSQL,
  155. i.e. when a version reaches End of Life Synapse will withdraw support for that
  156. version in future releases.</p>
  157. <p>Details on the upstream support life cycles for Python and PostgreSQL are
  158. documented at <a href="https://endoflife.date/python">https://endoflife.date/python</a> and
  159. <a href="https://endoflife.date/postgresql">https://endoflife.date/postgresql</a>.</p>
  160. <p>A Rust compiler is required to build Synapse from source. For any given release
  161. the minimum required version may be bumped up to a recent Rust version, and so
  162. people building from source should ensure they can fetch recent versions of Rust
  163. (e.g. by using <a href="https://rustup.rs/">rustup</a>).</p>
  164. <p>The oldest supported version of SQLite is the version
  165. <a href="https://packages.debian.org/buster/libsqlite3-0">provided</a> by
  166. <a href="https://wiki.debian.org/DebianOldStable">Debian oldstable</a>.</p>
  167. <h2 id="context"><a class="header" href="#context">Context</a></h2>
  168. <p>It is important for system admins to have a clear understanding of the platform
  169. requirements of Synapse and its deprecation policies so that they can
  170. effectively plan upgrading their infrastructure ahead of time. This is
  171. especially important in contexts where upgrading the infrastructure requires
  172. auditing and approval from a security team, or where otherwise upgrading is a
  173. long process.</p>
  174. <p>By following the upstream support life cycles Synapse can ensure that its
  175. dependencies continue to get security patches, while not requiring system admins
  176. to constantly update their platform dependencies to the latest versions.</p>
  177. <p>For Rust, the situation is a bit different given that a) the Rust foundation
  178. does not generally support older Rust versions, and b) the library ecosystem
  179. generally bump their minimum support Rust versions frequently. In general, the
  180. Synapse team will try to avoid updating the dependency on Rust to the absolute
  181. latest version, but introducing a formal policy is hard given the constraints of
  182. the ecosystem.</p>
  183. <p>On a similar note, SQLite does not generally have a concept of &quot;supported
  184. release&quot;; bugfixes are published for the latest minor release only. We chose to
  185. track Debian's oldstable as this is relatively conservative, predictably updated
  186. and is consistent with the <code>.deb</code> packages released by Matrix.org.</p>
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