diff --git a/pyproject.toml b/pyproject.toml
index 5975ea3..ec1d42d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ docs = [
     "sphinx-toolbox>=4.0.0",
 ]
 test = [
-  "pytest ==8.*",
+  "pytest ==9.*",
 ]
 
 [tool.flit.module]