diff --git a/src/matcalc/utils.py b/src/matcalc/utils.py
index 98ab6b8f..ee120c07 100644
--- a/src/matcalc/utils.py
+++ b/src/matcalc/utils.py
@@ -82,6 +82,7 @@
     "MatterSim-v1.0.0-5M": {"provider": "mattersim", "load_path": "MatterSim-v1.0.0-5M.pth"},
     # FAIRChem (UMA family) — upstream uses ``uma-s-1p2`` style; we expose them
     # under the unified ``<Arch>-<Size>-<Version>`` form.
+    "UMA-S-1.2.1": {"provider": "fairchem", "model": "uma-s-1p2p1", "task_name": "omat"},
     "UMA-S-1.2": {"provider": "fairchem", "model": "uma-s-1p2", "task_name": "omat"},
     "UMA-S-1.1": {"provider": "fairchem", "model": "uma-s-1p1", "task_name": "omat"},
     "UMA-M-1.1": {"provider": "fairchem", "model": "uma-m-1p1", "task_name": "omat"},