diff --git a/requirements_test.txt b/requirements_test.txt
index 90c9658..31e0a6c 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -5,6 +5,6 @@ isort==5.12.0
 mypy==1.7.1
 types-protobuf==4.24.0.4
 pytest>=6.2.4,<8
-pytest-asyncio>=0.15.1,<1
+pytest-asyncio>=0.15.1,<=0.21.1
 mock>=4.0.3,<6
 pytest-cov>=4.1.0