diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 32f8a41..82941b9 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -72,7 +72,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip wheel setuptools
           python -m pip install pytest pytest-astropy pyyaml coveralls
-          python -m pip install numpy\<2.0 scipy matplotlib astropy\<6.0
+          python -m pip install numpy\<1.23 scipy\<1.9 matplotlib\<3.9 astropy\<5.1
 
       - name: Run the test with coverage
         run: pytest --cov
diff --git a/speclite/filters.py b/speclite/filters.py
index 1c1c076..93c0fb7 100644
--- a/speclite/filters.py
+++ b/speclite/filters.py
@@ -1991,12 +1991,8 @@ def plot_filters(responses, wavelength_unit=None,
     min_wlen, max_wlen = min(effective_wavelengths), max(effective_wavelengths)
 
     import matplotlib.pyplot as plt
-    try:
-        import matplotlib.colormaps as cm
-    except ImportError:
-        import matplotlib.cm as cm
 
-    cmap = cm.get_cmap(cmap)
+    cmap = plt.get_cmap(cmap)
     fig, ax = plt.subplots()
     plt.xscale(wavelength_scale)
     if wavelength_limits is not None: