diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 4b80225f..ec7b6c27 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -20,7 +20,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
         pip-selectors: ["pyqt5"]
 
       fail-fast: false
@@ -52,6 +52,7 @@ jobs:
       shell: bash -l {0}
       run: |
         set -vxeuo pipefail
+        python -m pip install wheel setuptools
         python -m pip install -r requirements-dev.txt
         python -m pip list
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 01325a81..f1145c34 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -16,7 +16,7 @@ qtpy
 sphinx
 # These are dependencies of various sphinx extensions for documentation.
 ipython
-matplotlib
+matplotlib>=3.3.0
 numpydoc
 sphinx-copybutton
 sphinx_rtd_theme