diff --git a/pyproject.toml b/pyproject.toml
index c5fdf53..64bb008 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ dependencies = [
 [project.optional-dependencies]
 test = [
     "matplotlib==3.9.2",
-    "pytest-cov==5.0.0",
+    "pytest-cov==6.0.0",
     "pytest-mpl==0.17.0",
     "pytest==8.3.3",
 ]