diff --git a/doc/en/requirements.txt b/doc/en/requirements.txt
index 36801746a..3369bd10b 100644
--- a/doc/en/requirements.txt
+++ b/doc/en/requirements.txt
@@ -2,7 +2,8 @@ pallets-sphinx-themes
 pluggy>=1.2.0
 pygments-pytest>=2.3.0
 sphinx-removed-in>=0.2.0
-sphinx>=5,<8
+# In Sphinx 6 and 7, the search bar disappears; restrict this for now until we find a solution.
+sphinx>=5,<6
 sphinxcontrib-trio
 sphinxcontrib-svg2pdfconverter
 # Pin packaging because it no longer handles 'latest' version, which