diff --git a/pyproject.toml b/pyproject.toml
index 95391d0..7c780fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ python = "^3.8"
 
 [tool.poetry.group.dev.dependencies]
 pytest = ">=7.1.3,<9.0.0"
-pytest-cov = ">=3,<5"
+pytest-cov = ">=3,<6"
 pytest-mock = "^3.8.2"
 anyio = {extras = ["trio"], version = ">=3.6.1,<5.0.0"}
 tox = ">=3.26,<5.0"