diff --git a/pyproject.toml b/pyproject.toml
index a5c529e..516da98 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,8 +26,8 @@ Documentation = "https://attr-utils.readthedocs.io/en/latest"
 
 [project.optional-dependencies]
 pprint = [ "prettyprinter==0.18.0",]
-sphinx = [ "sphinx<5,>=3.2.0", "sphinx-toolbox>=2.16.0",]
-all = [ "prettyprinter==0.18.0", "sphinx<5,>=3.2.0", "sphinx-toolbox>=2.16.0",]
+sphinx = [ "sphinx<8,>=3.2.0", "sphinx-toolbox>=2.16.0",]
+all = [ "prettyprinter==0.18.0", "sphinx<8,>=3.2.0", "sphinx-toolbox>=2.16.0",]
 
 [tool.mkrecipe]
 conda-channels = [ "conda-forge", "domdfcoding",]