diff --git a/README.md b/README.md
index 72d87b8..5744a37 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,11 @@ does not attempt to recreate all of the matlab code from
 matlabPyrTools. The goal is to create a Python interface for the C
 code at the heart of matlabPyrTools.
 
+**NOTE**: If you are only interested in the complex steerable pyramid, we have a
+pytorch implementation in the
+[plenoptic](https://github.com/LabForComputationalVision/plenoptic/) package;
+this implementation is differentiable.
+
 # Installation
 
 It's recommended you install from pip: `pip install pyrtools`. The pip
diff --git a/pyrtools/pyramids/pyramid.py b/pyrtools/pyramids/pyramid.py
index 54b9b8b..9670582 100644
--- a/pyrtools/pyramids/pyramid.py
+++ b/pyrtools/pyramids/pyramid.py
@@ -49,7 +49,7 @@ class Pyramid:
 
     def __init__(self, image, edge_type):
 
-        self.image = np.array(image).astype(np.float)
+        self.image = np.array(image).astype(float)
         if self.image.ndim == 1:
             self.image = self.image.reshape(-1, 1)
         assert self.image.ndim == 2, "Error: Input signal must be 1D or 2D."
diff --git a/pyrtools/tools/display.py b/pyrtools/tools/display.py
index 2a07856..4f03098 100644
--- a/pyrtools/tools/display.py
+++ b/pyrtools/tools/display.py
@@ -815,7 +815,7 @@ def animshow(video, framerate=2., as_html5=True, repeat=False,
 
     def animate_video(t):
         for i, a in enumerate(artists):
-            frame = video[i][t].astype(np.float)
+            frame = video[i][t].astype(float)
             a.set_data(frame)
         return artists