diff --git a/redbiom/fetch.py b/redbiom/fetch.py
index 023a75c..770e120 100644
--- a/redbiom/fetch.py
+++ b/redbiom/fetch.py
@@ -429,7 +429,7 @@ def taxon_ancestors(context, ids, get=None, normalize=None):
     ---------------------
     HMGET <context>:taxonomy-parents <child> ... <child>
     """
-    from future.moves.itertools import zip_longest
+    from itertools import zip_longest
     import redbiom._requests
 
     if get is None:
diff --git a/redbiom/tests/test_fetch.py b/redbiom/tests/test_fetch.py
index e24f8d5..a122a02 100644
--- a/redbiom/tests/test_fetch.py
+++ b/redbiom/tests/test_fetch.py
@@ -1,6 +1,6 @@
 import unittest
 import requests
-from future.moves.itertools import zip_longest
+from itertools import zip_longest
 
 import numpy as np
 import biom
diff --git a/redbiom/tests/test_summarize.py b/redbiom/tests/test_summarize.py
index 72b7b67..c37e015 100644
--- a/redbiom/tests/test_summarize.py
+++ b/redbiom/tests/test_summarize.py
@@ -3,7 +3,7 @@
 
 import biom
 import pandas as pd
-import pandas.util.testing as pdt
+import pandas.testing as pdt
 
 import redbiom
 import redbiom.admin
diff --git a/redbiom/tests/test_where_expr.py b/redbiom/tests/test_where_expr.py
index af90339..713337d 100644
--- a/redbiom/tests/test_where_expr.py
+++ b/redbiom/tests/test_where_expr.py
@@ -1,6 +1,6 @@
 import unittest
 import pandas as pd
-import pandas.util.testing as pdt
+import pandas.testing as pdt
 
 from redbiom.where_expr import whereeval, _cast_retain_numeric
 
@@ -19,7 +19,9 @@ class WhereTests(unittest.TestCase):
     def test_cast_retain_numeric(self):
         tests = [(pd.Series(['a', '10', '1.23']),
                   pd.Series([10.0, 1.23], index=[1, 2])),
-                 (pd.Series(['a', 'b', 'c']), pd.Series([])),
+                 # the default dtype for empty Series was changed from float64
+                 # to object for current versions of Pandas.
+                 (pd.Series(['a', 'b', 'c']), pd.Series([], dtype='float64')),
                  (pd.Series(['1', '2', '3', '4']),
                   pd.Series([1, 2, 3, 4], index=[0, 1, 2, 3]))]