diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index a3a4a79d3..7e71cba34 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -37,17 +37,18 @@ jobs:
     - name: Install dependencies and package
       run: pip install .[tests,optional_plotting,optional_io_formats,tutorials]
 
+    # run tests without Matplotlib & CodeCode tests on earlier Python versions
     - name: Test with pytest
-      if: ${{ matrix.python-version != '3.10' }}
+      if: ${{ matrix.python-version != '3.11' }}
       run: pytest tests
 
-    # only execute Matplotlib tests & CodeCov on latest Python version
+    # run tests with Matplotlib & CodeCov on latest Python version
     - name: Test with pytest including Matplotlib & Codecov
-      if: ${{ matrix.python-version == '3.10' }}
+      if: ${{ matrix.python-version == '3.11' }}
       run: pytest tests --mpl --cov=./ --cov-report=xml
 
     - name: Upload coverage report to Codecov
-      if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == '3.10' }}
+      if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11' }}
       uses: codecov/codecov-action@v3
       with:
         file: ./coverage.xml
diff --git a/tests/expected_figs/test_boxplot.png b/tests/expected_figs/test_boxplot.png
index ed4be661d..cab39de7d 100644
Binary files a/tests/expected_figs/test_boxplot.png and b/tests/expected_figs/test_boxplot.png differ
diff --git a/tests/expected_figs/test_boxplot_hue.png b/tests/expected_figs/test_boxplot_hue.png
index f915ed0f0..767b20e7a 100644
Binary files a/tests/expected_figs/test_boxplot_hue.png and b/tests/expected_figs/test_boxplot_hue.png differ