diff --git a/pyproject.toml b/pyproject.toml
index 4bb3103..172cc54 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ yamllint = "^1.35.0"
 isort = "^6.0.1"
 toml = "^0.10.0"
 black = ">=25.1,<27.0"
-pytest = "^8.3.1"
+pytest = ">=8.3.1,<10.0.0"
 httpx = { version = ">=0.24.0", optional = true }
 pytest-cov = { version = "^6.1.1", optional = true }
 coverage = "^7.2.5"