diff --git a/packages/python/plotly/plotly/figure_factory/_ternary_contour.py b/packages/python/plotly/plotly/figure_factory/_ternary_contour.py
index f45a9fcc135..52c7099bced 100644
--- a/packages/python/plotly/plotly/figure_factory/_ternary_contour.py
+++ b/packages/python/plotly/plotly/figure_factory/_ternary_contour.py
@@ -6,9 +6,9 @@
 from plotly.graph_objs import graph_objs as go
 
 np = optional_imports.get_module("numpy")
-sk_measure = optional_imports.get_module("skimage.measure")
 scipy_interp = optional_imports.get_module("scipy.interpolate")
 
+from skimage import measure
 
 # -------------------------- Layout ------------------------------
 
@@ -305,8 +305,8 @@ def _extract_contours(im, values, colors):
     all_contours1, all_values1, all_areas1, all_colors1 = [], [], [], []
     all_contours2, all_values2, all_areas2, all_colors2 = [], [], [], []
     for i, val in enumerate(values):
-        contour_level1 = sk_measure.find_contours(zz_min, val)
-        contour_level2 = sk_measure.find_contours(zz_max, val)
+        contour_level1 = measure.find_contours(zz_min, val)
+        contour_level2 = measure.find_contours(zz_max, val)
         all_contours1.extend(contour_level1)
         all_contours2.extend(contour_level2)
         all_values1.extend([val] * len(contour_level1))
@@ -614,6 +614,7 @@ def create_ternary_contour(
             """\
     The create_ternary_contour figure factory requires the scipy package"""
         )
+    sk_measure = optional_imports.get_module("skimage")
     if sk_measure is None:
         raise ImportError(
             """\
diff --git a/packages/python/plotly/plotly/tests/test_core/test_px/test_px.py b/packages/python/plotly/plotly/tests/test_core/test_px/test_px.py
new file mode 100644
index 00000000000..001bdb6997a
--- /dev/null
+++ b/packages/python/plotly/plotly/tests/test_core/test_px/test_px.py
@@ -0,0 +1,12 @@
+import plotly.express as px
+import numpy as np
+
+
+def test_scatter():
+    iris = px.data.iris()
+    fig = px.scatter(iris, x="sepal_width", y="sepal_length")
+    assert fig.data[0].type == "scatter"
+    assert np.all(fig.data[0].x == iris.sepal_width)
+    assert np.all(fig.data[0].y == iris.sepal_length)
+    # test defaults
+    assert fig.data[0].mode == "markers"
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_figure_factory/test_figure_factory.py b/packages/python/plotly/plotly/tests/test_optional/test_figure_factory/test_figure_factory.py
index 2d009798059..a08353a9026 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_figure_factory/test_figure_factory.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_figure_factory/test_figure_factory.py
@@ -15,7 +15,7 @@
 shapely = optional_imports.get_module("shapely")
 shapefile = optional_imports.get_module("shapefile")
 gp = optional_imports.get_module("geopandas")
-sk_measure = optional_imports.get_module("skimage.measure")
+sk_measure = optional_imports.get_module("skimage")
 
 
 class TestDistplot(NumpyTestUtilsMixin, TestCaseNoTemplate):
diff --git a/packages/python/plotly/tox.ini b/packages/python/plotly/tox.ini
index 4a0a056591b..df41b7e1df1 100644
--- a/packages/python/plotly/tox.ini
+++ b/packages/python/plotly/tox.ini
@@ -59,14 +59,14 @@ deps=
     pytz==2016.10
     retrying==1.3.3
     pytest==3.5.1
+    pandas==0.24.2
     backports.tempfile==1.0
     optional: --editable=file:///{toxinidir}/../plotly-geo
-    optional: numpy==1.11.3
+    optional: numpy==1.16.5
     optional: ipython[all]==5.1.0
     optional: ipywidgets==7.2.0
     optional: ipykernel==4.8.2
     optional: jupyter==1.0.0
-    optional: pandas==0.19.2
     optional: scipy==0.18.1
     optional: shapely==1.6.4
     optional: geopandas==0.3.0
@@ -74,7 +74,7 @@ deps=
     optional: pillow==5.2.0
     optional: matplotlib==2.2.3
     optional: xarray==0.10.9
-    optional: scikit-image==0.13.1
+    optional: scikit-image==0.14.4
 
 ; CORE ENVIRONMENTS
 [testenv:py27-core]