diff --git a/docs/requirements.txt b/docs/requirements.txt
index 2a9bbed..511ca50 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
-sphinx~=8.1.3
+sphinx~=9.1.0
 sphinx-rtd-theme~=3.0.2
diff --git a/pyproject.toml b/pyproject.toml
index e53b238..2d5323c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ dev = [
     "esbonio~=1.0.0",
 ]
 docs = [
-    "sphinx~=8.1.3",
+    "sphinx~=9.1.0",
     "sphinx-rtd-theme~=3.0.2",
 ]