diff --git a/snyk/models.py b/snyk/models.py
index 6e50c89..7da7d6d 100644
--- a/snyk/models.py
+++ b/snyk/models.py
@@ -139,7 +139,7 @@ class OrganizationGroup(DataClassJSONMixin):
 @dataclass
 class Package(DataClassJSONMixin):
     name: str
-    version: str
+    version: Optional[str] = None
     fixVersion: Optional[str] = None