diff --git a/packages/python/chart-studio/chart_studio/plotly/plotly.py b/packages/python/chart-studio/chart_studio/plotly/plotly.py
index 1e6257ab995..589b7aa1c85 100644
--- a/packages/python/chart-studio/chart_studio/plotly/plotly.py
+++ b/packages/python/chart-studio/chart_studio/plotly/plotly.py
@@ -430,7 +430,7 @@ def _swap_xy_data(data_obj):
 def byteify(input):
     """Convert unicode strings in JSON object to byte strings"""
     if isinstance(input, dict):
-        return {byteify(key): byteify(value) for key, value in input.iteritems()}
+        return {byteify(key): byteify(value) for key, value in input.items()}
     elif isinstance(input, list):
         return [byteify(element) for element in input]
     elif isinstance(input, unicode):
diff --git a/packages/python/plotly/plotly/express/_core.py b/packages/python/plotly/plotly/express/_core.py
index dd2d53be1ed..98619bfaed2 100644
--- a/packages/python/plotly/plotly/express/_core.py
+++ b/packages/python/plotly/plotly/express/_core.py
@@ -278,7 +278,7 @@ def make_trace_kwargs(args, trace_spec, trace_data, mapping_labels, sizeref):
         if attr_name == "dimensions":
             dims = [
                 (name, column)
-                for (name, column) in trace_data.iteritems()
+                for (name, column) in trace_data.items()
                 if ((not attr_value) or (name in attr_value))
                 and (
                     trace_spec.constructor != go.Parcoords