diff --git a/superset/utils/core.py b/superset/utils/core.py
index ce55814b22a3..009981722c1c 100644
--- a/superset/utils/core.py
+++ b/superset/utils/core.py
@@ -40,7 +40,7 @@
 
 import bleach
 import markdown as md
-import numpy as np
+import numpy
 import pandas as pd
 import parsedatetime
 import sqlalchemy as sa
@@ -344,12 +344,10 @@ def format_timedelta(td: timedelta) -> str:
 def base_json_conv(obj):
     if isinstance(obj, memoryview):
         obj = obj.tobytes()
-    if isinstance(obj, np.int64):
+    if isinstance(obj, numpy.int64):
         return int(obj)
-    elif isinstance(obj, np.bool_):
+    elif isinstance(obj, numpy.bool_):
         return bool(obj)
-    elif isinstance(obj, np.ndarray):
-        return obj.tolist()
     elif isinstance(obj, set):
         return list(obj)
     elif isinstance(obj, decimal.Decimal):
diff --git a/tests/utils_tests.py b/tests/utils_tests.py
index 5bbfec1b328c..8b0c45af55de 100644
--- a/tests/utils_tests.py
+++ b/tests/utils_tests.py
@@ -121,7 +121,6 @@ def test_json_iso_dttm_ser(self):
     def test_base_json_conv(self):
         assert isinstance(base_json_conv(numpy.bool_(1)), bool) is True
         assert isinstance(base_json_conv(numpy.int64(1)), int) is True
-        assert isinstance(base_json_conv(numpy.array([1, 2, 3])), list) is True
         assert isinstance(base_json_conv(set([1])), list) is True
         assert isinstance(base_json_conv(Decimal("1.0")), float) is True
         assert isinstance(base_json_conv(uuid.uuid4()), str) is True