From 5420e901364090346f3174e7125ba155eb568bc2 Mon Sep 17 00:00:00 2001
From: Rhys Goodall <reag2@cam.ac.uk>
Date: Thu, 24 Jun 2021 17:56:59 +0100
Subject: [PATCH] fix: update matplotlib 3daxes to use modern api.

---
 pymatgen/analysis/phase_diagram.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/pymatgen/analysis/phase_diagram.py b/pymatgen/analysis/phase_diagram.py
index a679c1fc395..60363431c80 100644
--- a/pymatgen/analysis/phase_diagram.py
+++ b/pymatgen/analysis/phase_diagram.py
@@ -2056,11 +2056,10 @@ def _get_3d_plot(self, label_stable=True):
         machines have matplotlib installed, I have done it this way.
         """
         import matplotlib.pyplot as plt
-        import mpl_toolkits.mplot3d.axes3d as p3
         from matplotlib.font_manager import FontProperties
 
         fig = plt.figure()
-        ax = p3.Axes3D(fig)
+        ax = fig.add_subplot(111, projection="3d")
         font = FontProperties(weight="bold", size=13)
         (lines, labels, unstable) = self.pd_plot_data
         count = 1