diff --git a/pyproject.toml b/pyproject.toml
index 6543caa..328c827 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ eagerx = "^0.1.33"
 [tool.poetry.dev-dependencies]
 black = "^22.1.0"
 pytest = "^7.0"
-pytest-cov = "^3.0.0"
+pytest-cov = "^4.0.0"
 flake8 = ">=3"
 flake8-bugbear = "^22.3.23"