diff --git a/.github/workflows/ci_linux.yml b/.github/workflows/ci_linux.yml
index 53ecc1c91145e..fcfd17c0b068d 100644
--- a/.github/workflows/ci_linux.yml
+++ b/.github/workflows/ci_linux.yml
@@ -19,14 +19,14 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - name: Cancel Previous Runs
-      uses: styfle/cancel-workflow-action@0.5.0
+      uses: styfle/cancel-workflow-action@0.11.0
       with:
         access_token: ${{ github.token }}
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: "Configure workflow"
       run: |
         sudo bash ./build/ci/tools/make_build_mode_env.sh -e ${{ github.event_name }} -m ${{ github.event.inputs.build_mode }}
@@ -59,7 +59,7 @@ jobs:
       run: |
         T_ID=${{ secrets.TELEMETRY_TRACK_ID }}; if [ -z "$T_ID" ]; then T_ID="''"; fi
         sudo bash ./build/ci/linux/build.sh -n ${{ github.run_id }} --telemetry $T_ID
-    - name: Package 
+    - name: Package
       if: env.DO_BUILD == 'true'
       run: |
         sudo bash ./build/ci/linux/package.sh
@@ -73,27 +73,34 @@ jobs:
         sudo bash ./build/ci/tools/osuosl/publish.sh -s ${{ secrets.OSUOSL_SSH_ENCRYPT_SECRET }} --os linux -v 3
     - name: Upload artifacts on GitHub
       if: env.DO_BUILD == 'true'
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_${{ github.run_id }}
         path: ./build.artifacts/
 
   run_mtests:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     env:
         # Enable AddressSanitizer in the mtest build
         CFLAGS: "-fsanitize=address -fno-omit-frame-pointer"
         CXXFLAGS: "-fsanitize=address -fno-omit-frame-pointer"
     steps:
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Setup environment
       run: |
         sudo bash ./build/ci/linux/setup.sh
     - name: Build
       run: |
         mkdir -p build.artifacts/env
+        #sudo bash ./build/ci/linux/build.sh -n ${{ github.run_id }} --build_mode mtests
         ./build/ci/linux/build.sh -n ${{ github.run_id }} --build_mode mtests
     - name: Run mtests 
       run: |
+        # At moment build and run mtests consume 13.4 Gb of the disk.
+        # After left too little free space.
+        # So, we remove unnecessary tools, for more free space
+        #sudo docker system prune -a -f
+        #sudo rm -rf /usr/local/lib/android
+        #sudo bash ./build/ci/linux/runmtests.sh
         ./build/ci/linux/runmtests.sh
diff --git a/.github/workflows/ci_lupdate.yml b/.github/workflows/ci_lupdate.yml
index 77d97a5a5e730..c73082839dee5 100644
--- a/.github/workflows/ci_lupdate.yml
+++ b/.github/workflows/ci_lupdate.yml
@@ -12,10 +12,10 @@ on:
         default: 'on'
 jobs:
   lupdate:
-    runs-on: macos-10.15
+    runs-on: macos-11
     steps:
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: "Configure workflow"
       run: |
         DO_PUBLISH='false'
@@ -45,7 +45,7 @@ jobs:
       run: |
         sudo bash ./build/ci/lupdate/publish_to_tx.sh -u ${{ secrets.TRANSIFEX_USER }} -p ${{ secrets.TRANSIFEX_PASSWORD }}
     - name: Upload artifacts on GitHub
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_tsfiles_${{ github.run_id }}
-        path: ./share/locale
\ No newline at end of file
+        path: ./share/locale
diff --git a/.github/workflows/ci_macos.yml b/.github/workflows/ci_macos.yml
index 4a9ce13d06759..a5a8af6aa18c8 100644
--- a/.github/workflows/ci_macos.yml
+++ b/.github/workflows/ci_macos.yml
@@ -23,13 +23,14 @@ env:
 jobs:
   build:    
     runs-on: macos-10.15
+    #runs-on: macos-11 may be needed in the near futur
     steps:
     - name: Cancel Previous Runs
-      uses: styfle/cancel-workflow-action@0.5.0
+      uses: styfle/cancel-workflow-action@0.11.0
       with:
         access_token: ${{ github.token }}
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 3
     - name: "Configure workflow"
@@ -106,7 +107,7 @@ jobs:
         bash ./build/ci/tools/sparkle_appcast_gen.sh -p macos
     - name: Upload artifacts on GitHub
       if: env.DO_BUILD == 'true'
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_${{ github.run_id }}
         path: ./build.artifacts/
diff --git a/.github/workflows/ci_tx2s3.yml b/.github/workflows/ci_tx2s3.yml
index d4117d18c7c34..abc23842d9ee0 100644
--- a/.github/workflows/ci_tx2s3.yml
+++ b/.github/workflows/ci_tx2s3.yml
@@ -10,7 +10,7 @@ on:
 
 jobs:
   tx2s3:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - name: "Configure workflow"
       run: |
@@ -29,7 +29,7 @@ jobs:
 
     - name: Clone repository
       if: env.DO_RUN == 'true'
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Setup environment
       if: env.DO_RUN == 'true'
@@ -43,7 +43,7 @@ jobs:
         
     - name: Upload artifacts on GitHub
       if: env.DO_RUN == 'true'
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_locale_${{ github.run_id }}
-        path: ./share/locale
\ No newline at end of file
+        path: ./share/locale
diff --git a/.github/workflows/ci_vtests.yml b/.github/workflows/ci_vtests.yml
index 8a78f3ecab660..c7ec89947baff 100644
--- a/.github/workflows/ci_vtests.yml
+++ b/.github/workflows/ci_vtests.yml
@@ -7,10 +7,10 @@ on:
 
 jobs:
   run_vtests:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 0
     - name: Retrieve base commit for PR
@@ -75,7 +75,7 @@ jobs:
         ./gen_compare
     - name: Upload artifact
       if: contains( env.found, '1') && contains( env.VTEST_DIFF_FOUND, 'true')
-      uses: actions/upload-artifact@v1
+      uses: actions/upload-artifact@v3
       with:
         name: compare
         path: ./vtest/compare
diff --git a/.github/workflows/ci_windows.yml b/.github/workflows/ci_windows.yml
index 6c1aa46361087..8da98e0e84e19 100644
--- a/.github/workflows/ci_windows.yml
+++ b/.github/workflows/ci_windows.yml
@@ -22,11 +22,11 @@ jobs:
     runs-on: windows-2022
     steps:
     - name: Cancel Previous Runs
-      uses: styfle/cancel-workflow-action@0.5.0
+      uses: styfle/cancel-workflow-action@0.11.0
       with:
         access_token: ${{ github.token }}
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         submodules: 'true'
     - name: "Configure workflow"
@@ -98,7 +98,7 @@ jobs:
         bash ./build/ci/tools/sparkle_appcast_gen.sh -p windows 
     - name: Upload artifacts on GitHub
       if: ${{ always() }}
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_x64_${{ github.run_id }}
         path: build.artifacts\ 
@@ -107,11 +107,11 @@ jobs:
     runs-on: windows-2022
     steps:
     - name: Cancel Previous Runs
-      uses: styfle/cancel-workflow-action@0.5.0
+      uses: styfle/cancel-workflow-action@0.11.0
       with:
         access_token: ${{ github.token }}
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 3
     - name: Fetch submodules
@@ -128,6 +128,7 @@ jobs:
         if [[ "$BUILD_MODE" == "testing_build" || "$BUILD_MODE" == "stable_build" ]]; then 
           DO_BUILD='true'  
         fi
+        DO_BUILD='true'  
         echo "!! ATTENTION !! Windows x32 build run only for 'testing_build' and 'stable_build', and SKIP for 'pull requests' and nightly"
         echo "DO_BUILD=$DO_BUILD" >> $GITHUB_ENV
         echo "DO_BUILD: $DO_BUILD"
@@ -178,7 +179,7 @@ jobs:
         bash ./build/ci/tools/sparkle_appcast_gen.sh -p windows        
     - name: Upload artifacts on GitHub
       if: env.DO_BUILD == 'true'
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_x86_${{ github.run_id }}
         path: build.artifacts\     
@@ -186,11 +187,11 @@ jobs:
     runs-on: windows-2022
     steps:
     - name: Cancel Previous Runs
-      uses: styfle/cancel-workflow-action@0.5.0
+      uses: styfle/cancel-workflow-action@0.11.0
       with:
         access_token: ${{ github.token }}
     - name: Clone repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         fetch-depth: 3
     - name: Fetch submodules
@@ -257,7 +258,7 @@ jobs:
         bash ./build/ci/tools/sparkle_appcast_gen.sh -p windows       
     - name: Upload artifacts on GitHub
       if: env.DO_BUILD == 'true'
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: MuseScore_Portable_${{ github.run_id }}
         path: build.artifacts\
diff --git a/.gitignore b/.gitignore
index a161e52a8efc7..0749073e3a853 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,3 +53,7 @@ VERSION
 SF_VERSION
 /mscore/data/mscore.aps
 /msvc.*
+
+# Created during (master) build
+thirdparty/lame/config.h
+thirdparty/flac/flac-1.3.4/config.h
diff --git a/build/ci/linux/Dockerfile b/build/ci/linux/Dockerfile
index be2606c80cd31..7420581269a1d 100644
--- a/build/ci/linux/Dockerfile
+++ b/build/ci/linux/Dockerfile
@@ -1,3 +1,3 @@
-FROM library/ubuntu:18.04
+FROM library/ubuntu:20.04
 COPY setup.sh /setup.sh
 RUN bash -ex setup.sh
diff --git a/build/ci/linux/setup.sh b/build/ci/linux/setup.sh
index 544ae3d12c179..7c4b857e81ae0 100755
--- a/build/ci/linux/setup.sh
+++ b/build/ci/linux/setup.sh
@@ -62,7 +62,6 @@ apt_packages_runtime=(
   libegl1-mesa-dev
   libodbc1
   libpq-dev
-  libssl1.0.0
   libxcomposite-dev
   libxcursor-dev
   libxi-dev
@@ -83,11 +82,11 @@ apt-get install -y --no-install-recommends \
 ##########################################################################
 
 # Get newer Qt (only used cached version if it is the same)
-qt_version="5152"
+qt_version="598"
 qt_dir="Qt/${qt_version}"
 if [[ ! -d "${qt_dir}" ]]; then
   mkdir -p "${qt_dir}"
-  qt_url="https://s3.amazonaws.com/utils.musescore.org/Qt${qt_version}_gcc64.7z"
+  qt_url="https://s3.amazonaws.com/utils.musescore.org/qt${qt_version}.zip"
   wget -q --show-progress -O qt5.zip "${qt_url}"
   7z x -y qt5.zip -o"${qt_dir}"
   rm -f qt5.zip
diff --git a/build/ci/windows/build.bat b/build/ci/windows/build.bat
index 37ea3f92297fa..bb2140a26f2f2 100644
--- a/build/ci/windows/build.bat
+++ b/build/ci/windows/build.bat
@@ -63,12 +63,17 @@ SET MSCORE_STABLE_BUILD="TRUE"
 
 :: TODO We need define paths during image creation
 SET "JACK_DIR=C:\Program Files (x86)\Jack"
-SET "QT_DIR=C:\Qt\5.15.2"
 
 IF %TARGET_PROCESSOR_BITS% == 32 ( 
-    SET "PATH=%QT_DIR%\msvc2019\bin;%JACK_DIR%;%PATH%"
+    :: SET "QT_DIR=C:\Qt\5.9.9"
+    :: SET "PATH=%QT_DIR%\msvc2015\bin;%JACK_DIR%;%PATH%"
+    :: for some strange reason the above doesn't work
+    SET "PATH=C:\Qt\5.9.9\msvc2015\bin;%JACK_DIR%;%PATH%"
 ) ELSE (
-    SET "PATH=%QT_DIR%\msvc2019_64\bin;%JACK_DIR%;%PATH%"
+    :: SET "QT_DIR=C:\Qt\5.15.2"
+    :: SET "PATH=%QT_DIR%\msvc2019_64\bin;%JACK_DIR%;%PATH%"
+    :: for some strange reason the above doesn't work
+    SET "PATH=C:\Qt\5.15.2\msvc2019_64\bin;%JACK_DIR%;%PATH%"
 )
 
 bash ./build/ci/tools/make_revision_env.sh 
diff --git a/build/ci/windows/setup.bat b/build/ci/windows/setup.bat
index cc1885c8acd60..ab321f98e8b2b 100644
--- a/build/ci/windows/setup.bat
+++ b/build/ci/windows/setup.bat
@@ -34,15 +34,15 @@ MKDIR %TEMP_DIR%
 :: Install Qt
 ECHO "=== Install Qt ==="
 
-:: Default for x64
-SET "Qt_ARCHIVE=Qt5152_msvc2019_64.7z"
-
 IF %TARGET_PROCESSOR_BITS% == 32 (
-    SET "Qt_ARCHIVE=Qt5152_msvc2019.7z"
+    SET "Qt_ARCHIVE=qt599_msvc2015.7z"
+    SET "QT_DIR=C:\Qt\5.9.9"
+) ELSE (
+    SET "Qt_ARCHIVE=Qt5152_msvc2019_64.7z"
+    SET "QT_DIR=C:\Qt\5.15.2"
 )
 
 SET "QT_URL=https://s3.amazonaws.com/utils.musescore.org/%Qt_ARCHIVE%"
-SET "QT_DIR=C:\Qt\5.15.2"
 
 CALL "wget.exe" -q --show-progress --no-check-certificate "%QT_URL%" -O "%TEMP_DIR%\%Qt_ARCHIVE%"
 CALL "7z" x -y "%TEMP_DIR%\%Qt_ARCHIVE%" "-o%QT_DIR%"
diff --git a/libmscore/scorefile.cpp b/libmscore/scorefile.cpp
index fd8c3f42cff79..53c8808251e03 100644
--- a/libmscore/scorefile.cpp
+++ b/libmscore/scorefile.cpp
@@ -757,7 +757,7 @@ bool Score::saveFile(QIODevice* f, bool msczFormat, bool onlySelection)
       xml.stag("museScore version=\"" MSC_VERSION "\"");
 
       if (!MScore::testMode) {
-            xml.tag("programVersion", VERSION);
+            xml.tag("programVersion", "3.6.3");
             xml.tag("programRevision", revision);
             }
       write(xml, onlySelection);
@@ -766,7 +766,7 @@ bool Score::saveFile(QIODevice* f, bool msczFormat, bool onlySelection)
             masterScore()->revisions()->write(xml);
       if (!onlySelection) {
             //update version values for i.e. plugin access
-            _mscoreVersion = VERSION;
+            _mscoreVersion = "3.6.3";
             _mscoreRevision = revision.toInt(0, 16);
             _mscVersion = MSCVERSION;
             }
diff --git a/mscore/cloud/uploadscoredialog.cpp b/mscore/cloud/uploadscoredialog.cpp
index c35e7d0329e41..51689b385b24d 100644
--- a/mscore/cloud/uploadscoredialog.cpp
+++ b/mscore/cloud/uploadscoredialog.cpp
@@ -28,10 +28,12 @@ namespace Ms {
 
 void MuseScore::showUploadScoreDialog()
       {
+#if 0
       if (MuseScore::unstable()) {
             QMessageBox::warning(this, tr("Save online"), tr("Saving scores online is disabled in this unstable prerelease version of MuseScore."));
             return;
       }
+#endif
       if (!currentScore())
             return;
       if (!currentScore()->sanityCheck(QString())) {
diff --git a/mscore/file.cpp b/mscore/file.cpp
index 1d44781a40fd5..d03e41e65c51f 100644
--- a/mscore/file.cpp
+++ b/mscore/file.cpp
@@ -3511,10 +3511,12 @@ static void parseSourceUrl(const QString& sourceUrl, int& uid, int& nid)
 
 bool MuseScore::saveOnline(const QStringList& inFilePaths)
       {
+#if 0
       if (MuseScore::unstable()) {
             qCritical() << qUtf8Printable(tr("Error: Saving scores online is disabled in this unstable prerelease version of MuseScore."));
             return false;
       }
+#endif
       if (!_loginManager->syncGetUser()) {
             return false;
             }
diff --git a/vtest/gen b/vtest/gen
index 29f2e04f6926c..54bc13bb2fa87 100755
--- a/vtest/gen
+++ b/vtest/gen
@@ -124,6 +124,9 @@ done
 echo "{}]" >> $JSON_FILE
 
 echo "Generate PNG files"
+# run the mtests in "minimal" platform for headless systems
+# enable fonts handling
+#export QT_QPA_PLATFORM=minimal:enablefonts
 $MSCORE -j $JSON_FILE -r $DPI >LOG 2>&1
 
 echo "LOG:"