diff --git a/elasticsearch/serializer.py b/elasticsearch/serializer.py
index 902fe8e09..37ad5724c 100644
--- a/elasticsearch/serializer.py
+++ b/elasticsearch/serializer.py
@@ -171,7 +171,6 @@ def _attempt_serialize_numpy(data: Any) -> Tuple[bool, Any]:
         elif isinstance(
             data,
             (
-                np.float_,
                 np.float16,
                 np.float32,
                 np.float64,
diff --git a/test_elasticsearch/test_serializer.py b/test_elasticsearch/test_serializer.py
index 9dc5f31e9..4f66ba9a2 100644
--- a/test_elasticsearch/test_serializer.py
+++ b/test_elasticsearch/test_serializer.py
@@ -89,7 +89,6 @@ def test_serializes_numpy_integers(json_serializer):
 @requires_numpy_and_pandas
 def test_serializes_numpy_floats(json_serializer):
     for np_type in (
-        np.float_,
         np.float32,
         np.float64,
     ):