diff --git a/docs/requirements.txt b/docs/requirements.txt
index 996aea7..ab55aad 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-Sphinx<8.0.0
+Sphinx<9.0.0
 sphinx-rtd-theme
 numpydoc
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 409d35b..9636483 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ test = [
 ]
 docs = [
     "numpydoc",
-    "Sphinx<8.0.0",
+    "Sphinx<9.0.0",
     "sphinx-autobuild",
     "sphinx_rtd_theme",
 ]