diff --git a/requirements.txt b/requirements.txt
index cb26e1833..74b607fa8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,10 @@ urllib3
 potodo
 jinja2
 docutils
-sphinx
+# The Sphinx version is pinned so that new versions that introduce
+# new warnings won't suddenly cause build failures.
+# See https://github.com/sphinx-doc/sphinx/issues/14162
+sphinx<9.0.0
 python-docs-theme
 dacite
 sphinx-lint
diff --git a/templates/build-details.html.jinja b/templates/build-details.html.jinja
index e74199355..93e9f6298 100644
--- a/templates/build-details.html.jinja
+++ b/templates/build-details.html.jinja
@@ -1,10 +1,5 @@
 {% extends "base.html.jinja" %}
 {% block main %}
-  <div class="alert alert-warning" role="alert">
-    <strong>Warning!</strong> There might be false positives in Sphinx build warnings! See
-    <a href="https://github.com/sphinx-doc/sphinx/issues/14162"
-       class="alert-link">sphinx#14162</a>.
-  </div>
   <table>
     <thead>
       <tr>