diff --git a/pyproject.toml b/pyproject.toml
index 75c85fa..249d891 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dev = [
     "requests-mock>=1.12",
     "pyright>=1.1.410",
 ]
-docs = ["sphinx>=6,<7", "sphinx-rtd-theme~=1.2"]
+docs = ["sphinx>=9,<10", "sphinx-rtd-theme~=1.2"]
 
 
 [project.urls]