diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index ff5aaf032f51..c2a4d2f42c81 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -3267,7 +3267,8 @@ def set_xlim(self, left=None, right=None, emit=True, auto=False,
         reverse = left > right
         left, right = self.xaxis.get_major_locator().nonsingular(left, right)
         left, right = self.xaxis.limit_range_for_scale(left, right)
-        left, right = sorted([left, right], reverse=reverse)
+        # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+        left, right = sorted([left, right], reverse=bool(reverse))
 
         self.viewLim.intervalx = (left, right)
         if auto is not None:
@@ -3649,7 +3650,8 @@ def set_ylim(self, bottom=None, top=None, emit=True, auto=False,
         reverse = bottom > top
         bottom, top = self.yaxis.get_major_locator().nonsingular(bottom, top)
         bottom, top = self.yaxis.limit_range_for_scale(bottom, top)
-        bottom, top = sorted([bottom, top], reverse=reverse)
+        # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+        bottom, top = sorted([bottom, top], reverse=bool(reverse))
 
         self.viewLim.intervaly = (bottom, top)
         if auto is not None:
diff --git a/lib/matplotlib/axis.py b/lib/matplotlib/axis.py
index a4cdffc55e14..e23b5748cf7c 100644
--- a/lib/matplotlib/axis.py
+++ b/lib/matplotlib/axis.py
@@ -2156,7 +2156,8 @@ def get_minpos(self):
     def set_inverted(self, inverted):
         # docstring inherited
         a, b = self.get_view_interval()
-        self.axes.set_xlim(sorted((a, b), reverse=inverted), auto=None)
+        # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+        self.axes.set_xlim(sorted((a, b), reverse=bool(inverted)), auto=None)
 
     def set_default_intervals(self):
         # docstring inherited
@@ -2463,7 +2464,8 @@ def get_minpos(self):
     def set_inverted(self, inverted):
         # docstring inherited
         a, b = self.get_view_interval()
-        self.axes.set_ylim(sorted((a, b), reverse=inverted), auto=None)
+        # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+        self.axes.set_ylim(sorted((a, b), reverse=bool(inverted)), auto=None)
 
     def set_default_intervals(self):
         # docstring inherited
diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
index 4202be9a1138..047234b365f5 100644
--- a/lib/mpl_toolkits/mplot3d/axes3d.py
+++ b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -626,7 +626,8 @@ def set_xlim3d(self, left=None, right=None, emit=True, auto=False,
         reverse = left > right
         left, right = self.xaxis.get_major_locator().nonsingular(left, right)
         left, right = self.xaxis.limit_range_for_scale(left, right)
-        left, right = sorted([left, right], reverse=reverse)
+        # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+        left, right = sorted([left, right], reverse=bool(reverse))
         self.xy_viewLim.intervalx = (left, right)
 
         if auto is not None: