diff --git a/pyproject.toml b/pyproject.toml
index 72f5f7a..8669873 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,7 @@ pre-commit = ">=2.17,<4.0"
 pre-commit-hooks = "^4.1.0"
 pytest = "^7.1.0"
 pytest-cov = "^4.0.0"
-pytest-asyncio = "^0.20.1"
+pytest-asyncio = ">=0.20.1,<0.22.0"
 pytest-mock = "^3.7.0"
 pylint = "^2.12.2"
 pyupgrade = "^3.0.0"