diff --git a/echopype/visualize/cm.py b/echopype/visualize/cm.py
index 99fa899347..15199169bd 100644
--- a/echopype/visualize/cm.py
+++ b/echopype/visualize/cm.py
@@ -68,7 +68,7 @@ def _create_cmap(rgb, under=None, over=None):
 
     if 'over' in colors_d:
         reg_map.set_over(colors_d['over'])
-    mpl.cm.register_cmap(cmap=reg_map)
+    mpl.colormaps.register(cmap=reg_map)
 
     # Register the reversed map
     reg_map_r = mpl.colors.ListedColormap(
@@ -79,7 +79,7 @@ def _create_cmap(rgb, under=None, over=None):
 
     if 'over' in colors_d:
         reg_map_r.set_under(colors_d['over'])
-    mpl.cm.register_cmap(cmap=reg_map_r)
+    mpl.colormaps.register(cmap=reg_map_r)
 
 # make colormaps available to call
 locals().update(cmap_d)
diff --git a/setup.cfg b/setup.cfg
index eaf86af608..16d5526c22 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -35,5 +35,5 @@ setup_requires =
 
 [options.extras_require]
 plot =
-    matplotlib
+    matplotlib>=3.7
     cmocean