diff --git a/pyproject.toml b/pyproject.toml
index b8363058..6654578d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ jsonschema = "^4.16.0"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.3"
-pytest-cov = "^4.0.0"
+pytest-cov = ">=4,<6"
 nbval = "^0.10.0"
 requests-mock = "^1.10.0"
 hypothesis = "^6.75"