diff -dupr a/lib/mpl_toolkits/tests/test_mplot3d.py b/lib/mpl_toolkits/tests/test_mplot3d.py
--- a/lib/mpl_toolkits/tests/test_mplot3d.py	2021-01-29 10:43:01.196582153 +0100
+++ b/lib/mpl_toolkits/tests/test_mplot3d.py	2021-01-29 10:44:36.084875177 +0100
@@ -150,7 +150,7 @@ def test_contourf3d_fill():
     ax.set_zlim(-1, 1)
 
 
-@mpl3d_image_comparison(['tricontour.png'])
+@mpl3d_image_comparison(['tricontour.png'], tol=0.02)
 def test_tricontour():
     fig = plt.figure()
 
