diff --git a/dreadnode/api/models.py b/dreadnode/api/models.py
index 671739b7..53685180 100644
--- a/dreadnode/api/models.py
+++ b/dreadnode/api/models.py
@@ -122,7 +122,7 @@ class TraceSpan(BaseModel):
 class Metric(BaseModel):
     """Metric data for a span in a trace."""
 
-    value: float
+    value: float | None
     """Value of the metric."""
     step: int
     """Step or iteration number for the metric."""