diff --git a/chord_metadata_service/experiments/schemas.py b/chord_metadata_service/experiments/schemas.py
index 089e0666a..2f5f08e49 100644
--- a/chord_metadata_service/experiments/schemas.py
+++ b/chord_metadata_service/experiments/schemas.py
@@ -24,7 +24,7 @@
         },
         "genome_assembly_id": {
             "type": "string",
-            "enum": ["GRCh37", "GRCh38"]
+            "enum": ["GRCh37", "GRCh38", "GRCm38", "GRCm39"]
         },
         "file_format": {
             "type": "string",