diff --git a/pyproject.toml b/pyproject.toml
index b003e6a1..838c2fb8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -82,7 +82,7 @@ dev = [
     "pdoc>=12,<15",
     "perflint>=0.7.1,<0.9.0",
     "pytest>=7.2,<10.0",
-    "pytest-cov>=4,<6",
+    "pytest-cov>=4,<8",
     "rich>=13,<15",
     "thermo>=0.2",
     "ruff>=0.0.210,<0.16.3",