diff --git a/.github/workflows/python-build.yml b/.github/workflows/python-build.yml
index 132cd17e..f1654f43 100644
--- a/.github/workflows/python-build.yml
+++ b/.github/workflows/python-build.yml
@@ -21,7 +21,7 @@ jobs:
         - {os: windows-latest, python-version: '3.9', architecture: x64}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.cfg.python-version }} ${{ matrix.cfg.architecture }}
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/python-stylecheck.yml b/.github/workflows/python-stylecheck.yml
index 11c7968d..6f2e2b9f 100644
--- a/.github/workflows/python-stylecheck.yml
+++ b/.github/workflows/python-stylecheck.yml
@@ -20,7 +20,7 @@ jobs:
         python-version: ['3.9']
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/python-unittests.yml b/.github/workflows/python-unittests.yml
index bcf7678d..bba6318d 100644
--- a/.github/workflows/python-unittests.yml
+++ b/.github/workflows/python-unittests.yml
@@ -20,7 +20,7 @@ jobs:
         python-version: ['3.9']
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
diff --git a/setup.cfg b/setup.cfg
index 583e6c3b..df2ad826 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,8 +13,9 @@ platforms = any
 
 [options]
 include_package_data = True
-python_requires = >=3.6
+python_requires = >=3.9
 install_requires =
+    Pillow>=10.0.1
     wxPython
     numpy~=1.17
     pyopengl~=3.0