diff --git a/pyproject.toml b/pyproject.toml
index 3df9fb9..56b5739 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ dependencies = [
 dynamic = ["version"]
 
 [project.optional-dependencies]
-dev = ["black==25.1.0", "flake8==7.3.0", "pytest==8.4.2"]
+dev = ["black==25.1.0", "flake8==7.3.0", "pytest==9.0.0"]
 docs = ["sphinx>=8.1.3", "sphinx-rtd-theme>=3.0.2"]
 
 [project.urls]