diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
index 4aebc1696543..1636e201019b 100644
--- a/lib/matplotlib/figure.py
+++ b/lib/matplotlib/figure.py
@@ -1253,11 +1253,13 @@ def colorbar(
# Store the value of gca so that we can set it back later on.
if cax is None:
if ax is None:
- raise ValueError(
+ _api.warn_deprecated("3.6", message=(
'Unable to determine Axes to steal space for Colorbar. '
+ 'Using gca(), but will raise in the future. '
'Either provide the *cax* argument to use as the Axes for '
'the Colorbar, provide the *ax* argument to steal space '
- 'from it, or add *mappable* to an Axes.')
+ 'from it, or add *mappable* to an Axes.'))
+ ax = self.gca()
current_ax = self.gca()
userax = False
if (use_gridspec and isinstance(ax, SubplotBase)):
diff --git a/lib/matplotlib/tests/test_colorbar.py b/lib/matplotlib/tests/test_colorbar.py
index 149ed4c3d22e..31097c12f061 100644
--- a/lib/matplotlib/tests/test_colorbar.py
+++ b/lib/matplotlib/tests/test_colorbar.py
@@ -1,10 +1,12 @@
import numpy as np
import pytest
+from matplotlib import _api
from matplotlib import cm
import matplotlib.colors as mcolors
import matplotlib as mpl
+
from matplotlib import rc_context
from matplotlib.testing.decorators import image_comparison
import matplotlib.pyplot as plt
@@ -319,7 +321,8 @@ def test_parentless_mappable():
pc = mpl.collections.PatchCollection([], cmap=plt.get_cmap('viridis'))
pc.set_array([])
- with pytest.raises(ValueError, match='Unable to determine Axes to steal'):
+ with pytest.warns(_api.MatplotlibDeprecationWarning,
+ match='Unable to determine Axes to steal'):
plt.colorbar(pc)
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