diff --git a/sentry_sdk/_types.py b/sentry_sdk/_types.py
index a39e27d884..0ae3e653a7 100644
--- a/sentry_sdk/_types.py
+++ b/sentry_sdk/_types.py
@@ -256,6 +256,7 @@ class SDKInfo(TypedDict):
     )
 
     MetricType = Literal["counter", "gauge", "distribution"]
+    MetricUnit = Union[DurationUnit, InformationUnit, str]
 
     Metric = TypedDict(
         "Metric",
@@ -266,7 +267,7 @@ class SDKInfo(TypedDict):
             "name": str,
             "type": MetricType,
             "value": float,
-            "unit": Optional[str],
+            "unit": Optional[MetricUnit],
             "attributes": Attributes,
         },
     )