diff --git a/pyproject.toml b/pyproject.toml
index c860cff..8c16c40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,7 +64,7 @@ version = {attr = "diffannotator.config.__version__"}
 # see: https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#dynamic-metadata
 [project.optional-dependencies]
 dev = [
-  "pytest==9.0.2",  # includes 'subtests' since version 9.0.0
+  "pytest==9.1.1",  # includes 'subtests' since version 9.0.0
   "pytest-benchmark==5.2.3",
   "pytest-clarity==1.0.1",
   "psutil==7.2.2",