diff --git a/caravel/viz.py b/caravel/viz.py
index 6abd85bd2b..13449b720d 100755
--- a/caravel/viz.py
+++ b/caravel/viz.py
@@ -1027,7 +1027,7 @@ class NVD3TimeSeriesViz(NVD3Viz):
 
         if self.sort_series:
             dfs = df.sum()
-            dfs.sort(ascending=False)
+            dfs.sort_values(ascending=False, inplace=True)
             df = df[dfs.index]
 
         if form_data.get("contribution"):
@@ -1252,7 +1252,7 @@ class DistributionBarViz(DistributionPieViz):
         fd = self.form_data
 
         row = df.groupby(self.groupby).sum()[self.metrics[0]].copy()
-        row.sort(ascending=False)
+        row.sort_values(ascending=False, inplace=True)
         columns = fd.get('columns') or []
         pt = df.pivot_table(
             index=self.groupby,