diff --git a/.github/workflows/build_release.yml b/.github/workflows/build_release.yml
index 3d928a8..940cb71 100644
--- a/.github/workflows/build_release.yml
+++ b/.github/workflows/build_release.yml
@@ -10,11 +10,11 @@ jobs:
       AUTOMATION_GITHUB_TOKEN: ${{ secrets.AUTOMATION_GITHUB_TOKEN }}
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.9 (64bit)
+    - name: Set up Python 3.10 (64bit)
       uses: actions/setup-python@v2
       with:
-        python-version: 3.9
-        architecture: x64
+        python-version: "3.10"
+        architecture: "x64"
     - name: Install Python dependencies (64bit)
       run: |
         python --version
@@ -43,8 +43,8 @@ jobs:
     - name: Set up Python 3.8 (32bit and legacy)
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
-        architecture: x86
+        python-version: "3.8"
+        architecture: "x86"
     - name: Install Python dependencies (32bit and legacy)
       run: |
         python --version
@@ -73,8 +73,8 @@ jobs:
       # We need the official Python, because the GA ones only support newer macOS versions
       # The deployment target is picked up by the Python build tools automatically
       # If updated, make sure to also set LSMinimumSystemVersion in SABnzbd.spec
-      PYTHON_VERSION: 3.9.7
-      MACOSX_DEPLOYMENT_TARGET: 10.9
+      PYTHON_VERSION: "3.10.0"
+      MACOSX_DEPLOYMENT_TARGET: "10.9"
     steps:
     - uses: actions/checkout@v2
     - name: Cache Python download
@@ -85,15 +85,17 @@ jobs:
         key: macOS-Python-${{ env.PYTHON_VERSION }}
     - name: Get Python
       if: steps.cache-python-download.outputs.cache-hit != 'true'
-      run: curl https://www.python.org/ftp/python/${PYTHON_VERSION}/python-${PYTHON_VERSION}-macosx10.9.pkg -o ~/python.pkg
+      run: curl https://www.python.org/ftp/python/${PYTHON_VERSION}/python-${PYTHON_VERSION}-macos11.pkg -o ~/python.pkg
     - name: Install Python
       run: sudo installer -pkg ~/python.pkg -target /
     - name: Install Python dependencies
+      # We need to build the PyInstaller bootloader from sources:
+      # https://github.com/pyinstaller/pyinstaller/issues/6235
       run: |
         python3 --version
         pip3 install --upgrade pip wheel
         pip3 install --upgrade -r requirements.txt
-        pip3 install --upgrade -r builder/requirements.txt
+        pip3 install --upgrade -r builder/requirements.txt --no-binary pyinstaller
     - name: Import macOS codesign certificates
       uses: apple-actions/import-codesign-certs@v1
       if: env.SIGNING_AUTH
diff --git a/builder/package.py b/builder/package.py
index ccaccea..e945d8e 100644
--- a/builder/package.py
+++ b/builder/package.py
@@ -26,7 +26,6 @@ import subprocess
 import tarfile
 import pkginfo
 import github
-from distutils.dir_util import copy_tree
 
 
 VERSION_FILE = "sabnzbd/version.py"
@@ -185,8 +184,7 @@ if __name__ == "__main__":
         # Run PyInstaller and check output
         run_external_command([sys.executable, "-O", "-m", "PyInstaller", "SABnzbd.spec"])
 
-        # Use special distutils function to merge the main and console directories
-        copy_tree("dist/SABnzbd-console", "dist/SABnzbd")
+        shutil.copytree("dist/SABnzbd-console", "dist/SABnzbd", dirs_exist_ok=True)
         safe_remove("dist/SABnzbd-console")
 
         # Remove unwanted DLL's
@@ -361,7 +359,7 @@ if __name__ == "__main__":
 
         # Copy all folders and files to the new folder
         for source_folder in extra_folders:
-            copy_tree(source_folder, os.path.join(src_folder, source_folder))
+            shutil.copytree(source_folder, os.path.join(src_folder, source_folder), dirs_exist_ok=True)
 
         # Copy all files
         for source_file in extra_files:
diff --git a/builder/requirements.txt b/builder/requirements.txt
index ffba04d..07231fd 100644
--- a/builder/requirements.txt
+++ b/builder/requirements.txt
@@ -1,5 +1,5 @@
 # Basic build requirements
-pyinstaller==4.2
+pyinstaller
 setuptools
 pkginfo
 certifi
diff --git a/tests/test_postproc.py b/tests/test_postproc.py
index 895956b..1942d05 100644
--- a/tests/test_postproc.py
+++ b/tests/test_postproc.py
@@ -9,7 +9,6 @@ tests.test_postproc- Tests of various functions in newspack, among which rar_ren
 """
 
 import shutil
-from distutils.dir_util import copy_tree
 from unittest import mock
 
 from sabnzbd.postproc import *
@@ -35,8 +34,7 @@ class TestPostProc:
 
             # create a fresh copy
             try:
-                # shutil.copytree(sourcedir, workingdir) gives problems on AppVeyor, so:
-                copy_tree(sourcedir, workingdir)
+                shutil.copytree(sourcedir, workingdir)
             except:
                 pytest.fail("Could not create copy of files for rar_renamer")