diff --git a/pyproject.toml b/pyproject.toml
index f68a68e9..4c04beda 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 ]
 requires-python = ">=3.11,<3.15"
 dependencies = [
-     "pymatgen>=2026.5.4",
+     "pymatgen @ git+https://github.com/materialsproject/pymatgen.git@test/cov-lobster-env",
      "numpy<3.0.0",
 ]