diff --git a/pyproject.toml b/pyproject.toml
index 4fa2ff6..7b91f3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-  "pytest==8.3.5",
+  "pytest==9.1.1",
   "pytest-cov==6.0.0",
   "hypothesis==6.130.8",
   "ruff==0.11.2",