diff --git a/src/spikeanalysis/spike_plotter.py b/src/spikeanalysis/spike_plotter.py
index dd8398d..7bee189 100644
--- a/src/spikeanalysis/spike_plotter.py
+++ b/src/spikeanalysis/spike_plotter.py
@@ -458,7 +458,7 @@ def plot_sm_fr(
         from .analysis_utils import histogram_functions as hf
 
         if self.cmap is not None:
-            cmap = mpl.colormap[self.cmap]
+            cmap = mpl.colormaps[self.cmap]
         else:
             cmap = mpl.colormaps["rainbow"]