diff --git a/pyproject.toml b/pyproject.toml
index ed542d4..58d3710 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ devel-types = [
 devel-test = [
   "coverage[toml]    ~=7.0",
   "pytest            ~=8.0",
-  "pytest-cov        ~=5.0",
+  "pytest-cov        ~=4.1.0",
 ]
 devel = ["runenv[devel-types,devel-test]", "ruff==0.7.1", "mkchangelog"]