diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index af548d7..1748fe6 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -15,7 +15,7 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "httpx>=0.28,<1.0",
-    "pytest>=8.3,<9.0",
+    "pytest>=8.3,<10.0",
     "pytest-asyncio>=0.26,<1.0",
     "ruff>=0.11,<1.0",
 ]