diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b953a3d36..4c609ec24 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,23 +29,24 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set Up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Build package
         run: |
           python -m pip install --upgrade pip
-          pip install build
+          python -m pip install build
           python -m build
 
       - name: Install package and dependencies
+        shell: bash
         run: |
-          pip install dist/plams-*.whl
-          pip install ".[chem,ams,analysis,dev]"
+          python -m pip install dist/plams-*.whl
+          python -m pip install ".[chem,ams,analysis,dev]"
 
       - name: Run Unit Tests
         working-directory: unit_tests
@@ -68,20 +69,23 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set Up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install Dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install ".[chem,ams,analysis,dev]"
+          python -m pip install ".[chem,ams,analysis,dev]"
           # Reinstall specific rdkit version on 3.8 to avoid bug in stubs on last supported version 
           if [ "${{ matrix.python-version }}" = "3.8" ]; then
-            pip install rdkit==2023.9.5 --force-reinstall
+            python -m pip install rdkit==2023.9.5 --force-reinstall
+          fi
+          if [ "${{ matrix.python-version }}" = "3.13" ]; then
+            python -m pip install rdkit==2026.3.2 --force-reinstall
           fi
 
       - name: Run Black
@@ -102,17 +106,17 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set Up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.x"
 
       - name: Install Dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install ".[docs]" snowballstemmer==2.2.0  # See: https://github.com/sphinx-doc/sphinx/issues/13533
+          python -m pip install ".[docs]"
 
       - name: Build Sphinx Docs
         working-directory: doc
diff --git a/src/scm/plams/tools/view.py b/src/scm/plams/tools/view.py
index 5988f5534..fc9573765 100644
--- a/src/scm/plams/tools/view.py
+++ b/src/scm/plams/tools/view.py
@@ -1004,12 +1004,7 @@ def generate_image(cls, system: Union[Molecule, "ChemicalSystem"], config: ViewC
                 elif _has_scm_chemsys and isinstance(system, ChemicalSystem):
                     regions = [system.get_regions_of_atom(at) for at in system]
 
-                try:
-                    import matplotlib.colormaps as colormaps
-                except ImportError:
-                    import matplotlib.cm as colormaps
-
-                cmap = colormaps.get_cmap("tab10")
+                cmap = plt.get_cmap("tab10")
                 color_counter = 0
                 region_cmap: Dict[str, colors.Colormap] = {}
                 for patch in ax.patches:
@@ -1026,7 +1021,7 @@ def generate_image(cls, system: Union[Molecule, "ChemicalSystem"], config: ViewC
                                 if region in region_cmap:
                                     region_color = region_cmap[region]
                                 else:
-                                    region_color = cmap.colors[color_counter]
+                                    region_color = cmap.colors[color_counter]  # type: ignore[attr-defined,index]
                                     region_cmap[region] = region_color
                                     color_counter += 1
                                 region_patch = patches.Circle(
diff --git a/unit_tests/test_tools_plot.py b/unit_tests/test_tools_plot.py
index 341e59ad0..f6c823cc0 100644
--- a/unit_tests/test_tools_plot.py
+++ b/unit_tests/test_tools_plot.py
@@ -181,7 +181,7 @@ def iterate_options(molecules, options):
     remove_text=True,
     extensions=["png"],
     style="mpl20",
-    tol=3,
+    tol=10,
 )
 def test_plot_band_structure(run_calculations, rkf_tools_plot):
     plt.close("all")
@@ -224,7 +224,7 @@ def test_plot_band_structure(run_calculations, rkf_tools_plot):
     remove_text=True,
     extensions=["png"],
     style="mpl20",
-    tol=3,
+    tol=10,
 )
 def test_plot_phonons_band_structure(run_calculations, rkf_tools_plot):
     plt.close("all")
@@ -265,7 +265,7 @@ def test_plot_phonons_band_structure(run_calculations, rkf_tools_plot):
     remove_text=True,
     extensions=["png"],
     style="mpl20",
-    tol=3,
+    tol=12,
 )
 def test_plot_phonons_dos(run_calculations, rkf_tools_plot):
     plt.close("all")
@@ -306,7 +306,7 @@ def test_plot_phonons_dos(run_calculations, rkf_tools_plot):
     remove_text=True,
     extensions=["png"],
     style="mpl20",
-    tol=1.0,
+    tol=12,
 )
 def test_plot_correlation(run_calculations, rkf_tools_plot):
     plt.close("all")
@@ -414,7 +414,7 @@ def test_plot_correlation(run_calculations, rkf_tools_plot):
     remove_text=True,
     extensions=["png"],
     style="mpl20",
-    tol=4,
+    tol=20,
 )
 def test_plot_msd(run_calculations, rkf_tools_plot, xyz_folder):
     plt.close("all")
@@ -529,7 +529,7 @@ def test_plot_msd_with_pisa(run_calculations, rkf_tools_plot, xyz_folder):
     remove_text=True,
     extensions=["png"],
     style="mpl20",
-    tol=11,
+    tol=20,
 )
 def test_plot_work_function(run_calculations, rkf_tools_plot):
     plt.close("all")