diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 33482df7c2..0e1c3b6715 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: ['3.8', '3.9', '3.10']
 
     steps:
     - uses: actions/checkout@v2
@@ -24,7 +24,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest pyfakefs==4.4.0 pytest-cov pytest-asyncio codecov
+        pip install flake8 pytest pyfakefs==4.5.6 pytest-cov pytest-asyncio codecov
         # Install required dependencies for pynq since we import it in setup.py
         pip install numpy cffi
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
diff --git a/tests/test_devicetree.py b/tests/test_devicetree.py
index 89921504b0..ccd909e390 100644
--- a/tests/test_devicetree.py
+++ b/tests/test_devicetree.py
@@ -25,7 +25,7 @@ def _add_dtbo(self, fd):
             dtbo_dir = os.path.dirname(fd.path)
             if self._fail:
                 print('Resetting contents')
-                fd._set_initial_contents('')
+                fd.set_initial_contents('')
             with open(os.path.join(dtbo_dir, 'status'), 'w') as f:
                 f.write('applied\n')