diff --git a/requirements/test.txt b/requirements/test.txt
index 748a9767..796a5f6f 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -142,7 +142,7 @@ snowballstemmer==2.1.0
     #   sphinx
 sortedcontainers==2.4.0
     # via hypothesis
-sphinx==4.0.2
+sphinx==8.1.3
     # via -r requirements/test.in
 sphinxcontrib-applehelp==1.0.2
     # via sphinx