diff --git a/docs/requirements.txt b/docs/requirements.txt
index 334e78215..4773d9b45 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,7 +4,7 @@
 urllib3<2
 # The builds for documentation fails with <0.18.0
 docutils>=0.18.1
-sphinx<=7.1.2
+sphinx<=9.1.0
 six
 testresources
 recommonmark
diff --git a/pyproject.toml b/pyproject.toml
index 23631c12b..a04115c1c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ requires = [
     # Documentation requirements (see docs/requirements.txt for details)
     "urllib3<2",
     "docutils>=0.18.1",
-    "sphinx<=7.1.2",
+    "sphinx<=9.1.0",
     "six",
     "testresources",
     "recommonmark",