diff --git a/pyproject.toml b/pyproject.toml
index 9c1eeee43..f00c62bdf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,8 +34,6 @@ python = "^3.8"
 jsonschema = "^4.4"
 
 [tool.poetry.dev-dependencies]
-# Starting from Python 3.8, asynctest is replaced with a unittest.mock.AsyncMock in standard library.
-asynctest = { version = "0.13.0", python = "~3.7" }
 pytest = "^7"
 pytest-asyncio = "^0.20.3"
 pytest-cov = "^4.0.0"