diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ec2d98d..ac4302c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -71,7 +71,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.7'
+          python-version: '3.9'
 
       - name: Check Python install
         run: |
@@ -84,8 +84,20 @@ jobs:
         run: |
           pip3 install -U setuptools wheel pip
           pip3 install twisted[tls] appnope requests certifi
-          pip3 install shiboken2==5.13.1 pyside2==5.13.1
-          pip3 install py2app
+          pip3 install shiboken2==5.15.2 pyside2==5.15.2
+          pip3 install altgraph modulegraph macholib
+
+      - name: Install py2app
+        run: |
+          git clone https://github.com/albertosottile/py2app.git
+          cd py2app
+          git checkout stubs
+          cd py2app/apptemplate
+          python3 setup.py build
+          cd ../..
+          python3 setup.py build
+          python3 setup.py install
+          cd ..
 
       - name: Check Python dependencies
         run: |
@@ -96,13 +108,13 @@ jobs:
           python3 -c "from py2app.recipes import pyside2"
           echo $DYLD_LIBRARY_PATH
           echo $DYLD_FRAMEWORK_PATH
-          python3 -c 'from distutils.sysconfig import get_config_var; print(get_config_var("LDLIBRARY"))'
+          # python3 -c 'from distutils.sysconfig import get_config_var; print(get_config_var("LDLIBRARY"))'
 
       - name: Build
         run: |
           python3 ci/pyside2_linker.py
-          export LIBPYTHON_FOLDER="$(python3 -c 'from distutils.sysconfig import get_config_var; print(get_config_var("LIBDIR"))')"
-          ln -s $LIBPYTHON_FOLDER/libpython3.7m.dylib $LIBPYTHON_FOLDER/libpython3.7.dylib
+          # export LIBPYTHON_FOLDER="$(python3 -c 'from distutils.sysconfig import get_config_var; print(get_config_var("LIBDIR"))')"
+          # ln -s $LIBPYTHON_FOLDER/libpython3.9m.dylib $LIBPYTHON_FOLDER/libpython3.9.dylib
           export DYLD_FRAMEWORK_PATH="$(python3 -c 'from PySide2.QtCore import QLibraryInfo; print(QLibraryInfo.location(QLibraryInfo.LibrariesPath))')"
           export DYLD_LIBRARY_PATH="$(python3 -c 'import os.path, PySide2; print(os.path.dirname(PySide2.__file__))'):$(python3 -c 'import os.path, shiboken2; print(os.path.dirname(shiboken2.__file__))')"
           python3 buildPy2app.py py2app
diff --git a/buildPy2app.py b/buildPy2app.py
index f3271e1..44f584e 100755
--- a/buildPy2app.py
+++ b/buildPy2app.py
@@ -31,7 +31,6 @@ OPTIONS = {
         'CFBundleIdentifier': 'pl.syncplay.Syncplay',
         'LSMinimumSystemVersion': '10.12.0',
         'NSHumanReadableCopyright': 'Copyright © 2019 Syncplay All Rights Reserved',
-        'NSRequiresAquaSystemAppearance': False,
     }
 }
 
diff --git a/ci/macos-deploy.sh b/ci/macos-deploy.sh
index 8478444..48b0d92 100755
--- a/ci/macos-deploy.sh
+++ b/ci/macos-deploy.sh
@@ -17,4 +17,4 @@ mkdir dist/Syncplay.app/Contents/Resources/es_419.lproj
 pip3 install dmgbuild
 mv syncplay/resources/macOS_readme.pdf syncplay/resources/.macOS_readme.pdf
 
-dmgbuild -s appdmg.py "Syncplay" dist_actions/Syncplay_${VER}.dmg
+python3 -m dmgbuild -s appdmg.py "Syncplay" dist_actions/Syncplay_${VER}.dmg
diff --git a/ci/macos_app_cleaner.py b/ci/macos_app_cleaner.py
index 4fc9fe3..27d1731 100644
--- a/ci/macos_app_cleaner.py
+++ b/ci/macos_app_cleaner.py
@@ -1,12 +1,20 @@
 import os
+import platform
+import shutil
 import zipfile
 
+from glob import glob
+
+pyver = platform.python_version_tuple()[0] + platform.python_version_tuple()[1]
+
+# clean Python library zip archive
+
 PATH = 'dist/Syncplay.app/Contents/Resources/lib'
 
-zin = zipfile.ZipFile(f'{PATH}/python37.zip', 'r')
+zin = zipfile.ZipFile(f'{PATH}/python{pyver}.zip', 'r')
 tbd = [path for path in zin.namelist() if 'PySide2/Qt/' in path]
 
-zout = zipfile.ZipFile(f'{PATH}/python37_new.zip', 'w', zipfile.ZIP_DEFLATED)
+zout = zipfile.ZipFile(f'{PATH}/python{pyver}_new.zip', 'w', zipfile.ZIP_DEFLATED)
 
 for item in zin.namelist():
     buffer = zin.read(item)
@@ -16,5 +24,50 @@ for item in zin.namelist():
 zout.close()
 zin.close()
 
-os.remove(f'{PATH}/python37.zip')
-os.rename(f'{PATH}/python37_new.zip', f'{PATH}/python37.zip')
+os.remove(f'{PATH}/python{pyver}.zip')
+os.rename(f'{PATH}/python{pyver}_new.zip', f'{PATH}/python{pyver}.zip')
+
+# clean Frameworks folder
+
+PATH = 'dist/Syncplay.app/Contents/Frameworks'
+
+to_be_kept = ['QtCore', 'QtDBus', 'QtGui', 'QtNetwork', 'QtPrintSupport', 'QtQml', 'QtWidgets']
+to_be_deleted = []
+
+for f in glob(f'{PATH}/Qt*'):
+    if not any({k in f for k in to_be_kept}):
+        to_be_deleted.append(f)
+
+for p in to_be_deleted:
+    if os.path.isdir(p):
+        shutil.rmtree(p, ignore_errors=True)
+    else:
+        os.remove(p)
+
+# Clean PySide2 folder
+
+PATH = 'dist/Syncplay.app/Contents/Resources/lib/python3.9/PySide2'
+
+shutil.rmtree(f'{PATH}/examples', ignore_errors=True)
+
+to_be_kept = ['QtCore', 'QtDBus', 'QtGui', 'QtNetwork', 'QtPrintSupport', 'QtQml', 'QtWidgets']
+to_be_deleted = []
+
+for f in glob(f'{PATH}/Qt*'):
+    if not any({k in f for k in to_be_kept}):
+        to_be_deleted.append(f)
+
+for p in to_be_deleted:
+    if os.path.isdir(p):
+        shutil.rmtree(p, ignore_errors=True)
+    else:
+        os.remove(p)
+
+# move .so from Framework to PySide2 folder
+
+FROM = 'dist/Syncplay.app/Contents/Frameworks'
+TO = 'dist/Syncplay.app/Contents/Resources/lib/python3.9/PySide2'
+
+for f in glob(f'{FROM}/Qt*.so'):
+    fn = os.path.basename(f)
+    shutil.move(f, f'{TO}/{fn}')