diff --git a/pyproject.toml b/pyproject.toml
index ed7b9cd..64b09ba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ pre-commit = ">=2.21,<4.0"
 pre-commit-hooks = "^4.4.0"
 pytest = "^7.2.2"
 pytest-cov = "^4.0.0"
-pytest-asyncio = "^0.20.3"
+pytest-asyncio = ">=0.20.3,<0.22.0"
 pytest-mock = "^3.10.0"
 vulture = "^2.7"
 yamllint = "^1.29.0"