diff --git a/pyproject.toml b/pyproject.toml
index 29bc5bd..83a1941 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ dev = [
     "insipid-sphinx-theme==0.*",
     "mypy==1.*",
     "mypy-extensions==1.*",
-    "pytest==8.*",
+    "pytest==9.*",
     "pytest-cov==5.*",
     "pytest-mock==3.*",
     "pytest-structlog==1.*",