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diff --git a/develop/development/contributing_guide.html b/develop/development/contributing_guide.html

index f1c7b71fbe..5c61bb26cd 100644
--- a/develop/development/contributing_guide.html
+++ b/develop/development/contributing_guide.html
@@ -189,7 +189,7 @@ source, you should install <code>poetry</code>.
 Of their installation methods, we recommend
 <a href="https://python-poetry.org/docs/#installing-with-pipx">installing <code>poetry</code> using <code>pipx</code></a>,</p>
 <pre><code class="language-shell">pip install --user pipx
-pipx install poetry==1.5.2  # Problems with Poetry 1.6, see https://github.com/matrix-org/synapse/issues/16147
+pipx install poetry==1.5.1  # Problems with Poetry 1.6, see https://github.com/matrix-org/synapse/issues/16147
 </code></pre>
 <p>but see poetry's <a href="https://python-poetry.org/docs/#installation">installation instructions</a>
 for other installation methods.</p>