diff --git a/.github/workflows/build-binary-packages.yml b/.github/workflows/build-binary-packages.yml
index 493d5e774..f4c1a5b5e 100644
--- a/.github/workflows/build-binary-packages.yml
+++ b/.github/workflows/build-binary-packages.yml
@@ -2,7 +2,7 @@ name: Build Binary Packages
 
 on:
   workflow_dispatch:
-  release: 
+  release:
     types: ["created"]
 
 jobs:
@@ -13,9 +13,9 @@ jobs:
     name: Build Ubuntu package
     strategy:
       matrix:
-        os:
-        - ubuntu-18.04
-        - ubuntu-20.04
+        ghc: ["9.6"]
+        cabal: ["3.10"]
+        os: ["ubuntu-24.04"]
 
     runs-on: ${{ matrix.os }}
 
@@ -25,12 +25,13 @@ jobs:
     # Note: `haskell-platform` is listed as requirement in debian/control,
     # which is why it's installed using apt instead of the Setup Haskell action.
 
-    # - name: Setup Haskell
-    #   uses: actions/setup-haskell@v1
-    #   id: setup-haskell-cabal
-    #   with:
-    #     ghc-version: ${{ matrix.ghc }}
-    #     cabal-version: ${{ matrix.cabal }}
+    - name: Setup Haskell
+      uses: haskell-actions/setup@v2
+      id: setup-haskell-cabal
+      with:
+        ghc-version: ${{ matrix.ghc }}
+        cabal-version: ${{ matrix.cabal }}
+      if: matrix.os == 'ubuntu-24.04'
 
     - name: Install build tools
       run: |
@@ -39,14 +40,15 @@ jobs:
           make \
           dpkg-dev \
           debhelper \
-          haskell-platform \
           libghc-json-dev \
-          python-dev \
           default-jdk \
-          libtool-bin
-
+          python-dev-is-python3 \
+          libtool-bin 
+        cabal install alex happy
+        
     - name: Build package
       run: |
+        export PYTHONPATH="/home/runner/work/gf-core/gf-core/debian/gf/usr/local/lib/python3.12/dist-packages/"
         make deb
 
     - name: Copy package
@@ -54,7 +56,7 @@ jobs:
         cp ../gf_*.deb dist/
 
     - name: Upload artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: gf-${{ github.event.release.tag_name }}-${{ matrix.os }}.deb
         path: dist/gf_*.deb
@@ -64,14 +66,14 @@ jobs:
       run: |
         mv dist/gf_*.deb dist/gf-${{ github.event.release.tag_name }}-${{ matrix.os }}.deb
 
-    - uses: actions/upload-release-asset@v1.0.2
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        upload_url: ${{ github.event.release.upload_url }}
-        asset_path: dist/gf-${{ github.event.release.tag_name }}-${{ matrix.os }}.deb
-        asset_name: gf-${{ github.event.release.tag_name }}-${{ matrix.os }}.deb
-        asset_content_type: application/octet-stream
+    #- uses: actions/upload-release-asset@v1.0.2
+    #  env:
+    #    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    #  with:
+    #    upload_url: ${{ github.event.release.upload_url }}
+    #    asset_path: dist/gf-${{ github.event.release.tag_name }}-${{ matrix.os }}.deb
+    #    asset_name: gf-${{ github.event.release.tag_name }}-${{ matrix.os }}.deb
+    #    asset_content_type: application/octet-stream
 
 # ---
 
@@ -79,16 +81,16 @@ jobs:
     name: Build macOS package
     strategy:
       matrix:
-        ghc: ["8.6.5"]
-        cabal: ["2.4"]
-        os: ["macos-10.15"]
+        ghc: ["9.6"]
+        cabal: ["3.10"]
+        os: ["macos-latest", "macos-13"]
     runs-on: ${{ matrix.os }}
 
     steps:
     - uses: actions/checkout@v2
 
     - name: Setup Haskell
-      uses: actions/setup-haskell@v1
+      uses: haskell-actions/setup@v2
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}
@@ -97,8 +99,10 @@ jobs:
     - name: Install build tools
       run: |
         brew install \
-          automake
+          automake \
+          libtool
         cabal v1-install alex happy
+        pip install setuptools
 
     - name: Build package
       run: |
@@ -107,24 +111,24 @@ jobs:
         make pkg
 
     - name: Upload artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
-        name: gf-${{ github.event.release.tag_name }}-macos
+        name: gf-${{ github.event.release.tag_name }}-${{ matrix.os }}
         path: dist/gf-*.pkg
         if-no-files-found: error
-    
+
     - name: Rename package
       run: |
         mv dist/gf-*.pkg dist/gf-${{ github.event.release.tag_name }}-macos.pkg
 
-    - uses: actions/upload-release-asset@v1.0.2
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        upload_url: ${{ github.event.release.upload_url }}
-        asset_path: dist/gf-${{ github.event.release.tag_name }}-macos.pkg
-        asset_name: gf-${{ github.event.release.tag_name }}-macos.pkg
-        asset_content_type: application/octet-stream
+    #- uses: actions/upload-release-asset@v1.0.2
+    #  env:
+    #    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    #  with:
+    #    upload_url: ${{ github.event.release.upload_url }}
+    #    asset_path: dist/gf-${{ github.event.release.tag_name }}-macos.pkg
+    #    asset_name: gf-${{ github.event.release.tag_name }}-macos.pkg
+    #    asset_content_type: application/octet-stream
 
 # ---
 
@@ -132,9 +136,9 @@ jobs:
     name: Build Windows package
     strategy:
       matrix:
-        ghc: ["8.6.5"]
-        cabal: ["2.4"]
-        os: ["windows-2019"]
+        ghc: ["9.6.7"]
+        cabal: ["3.10"]
+        os: ["windows-2022"]
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -147,6 +151,7 @@ jobs:
           base-devel
           gcc
           python-devel
+          autotools
 
     - name: Prepare dist folder
       shell: msys2 {0}
@@ -171,7 +176,8 @@ jobs:
     - name: Build Java bindings
       shell: msys2 {0}
       run: |
-        export JDKPATH=/c/hostedtoolcache/windows/Java_Adopt_jdk/8.0.292-10/x64
+        echo $JAVA_HOME_8_X64
+        export JDKPATH="$(cygpath -u "${JAVA_HOME_8_X64}")"
         export PATH="${PATH}:${JDKPATH}/bin"
         cd src/runtime/java
         make \
@@ -180,6 +186,9 @@ jobs:
         make install
         cp .libs/msys-jpgf-0.dll /c/tmp-dist/java/jpgf.dll
         cp jpgf.jar /c/tmp-dist/java
+      if: false
+    
+    # - uses: actions/setup-python@v5
 
     - name: Build Python bindings
       shell: msys2 {0}
@@ -188,12 +197,13 @@ jobs:
         EXTRA_LIB_DIRS: /mingw64/lib
       run: |
         cd src/runtime/python
+        pacman --noconfirm -S python-setuptools
         python setup.py build
         python setup.py install
-        cp /usr/lib/python3.9/site-packages/pgf* /c/tmp-dist/python
+        cp -r /usr/lib/python3.12/site-packages/pgf* /c/tmp-dist/python
 
     - name: Setup Haskell
-      uses: actions/setup-haskell@v1
+      uses: haskell-actions/setup@v2
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}
@@ -205,13 +215,13 @@ jobs:
 
     - name: Build GF
       run: |
-        cabal install --only-dependencies -fserver
+        cabal install -fserver --only-dependencies 
         cabal configure -fserver
         cabal build
-        copy dist\build\gf\gf.exe C:\tmp-dist
+        copy dist-newstyle/build/x86_64-windows/ghc-${{matrix.ghc}}/*/x/gf/build/gf/gf.exe C:/tmp-dist
 
     - name: Upload artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: gf-${{ github.event.release.tag_name }}-windows
         path: C:\tmp-dist\*
@@ -220,11 +230,11 @@ jobs:
     - name: Create archive
       run: |
         Compress-Archive C:\tmp-dist C:\gf-${{ github.event.release.tag_name }}-windows.zip
-    - uses: actions/upload-release-asset@v1.0.2
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        upload_url: ${{ github.event.release.upload_url }}
-        asset_path: C:\gf-${{ github.event.release.tag_name }}-windows.zip
-        asset_name: gf-${{ github.event.release.tag_name }}-windows.zip
-        asset_content_type: application/zip
+    #- uses: actions/upload-release-asset@v1.0.2
+    #  env:
+    #    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    #  with:
+    #    upload_url: ${{ github.event.release.upload_url }}
+    #    asset_path: C:\gf-${{ github.event.release.tag_name }}-windows.zip
+    #    asset_name: gf-${{ github.event.release.tag_name }}-windows.zip
+    #    asset_content_type: application/zip
diff --git a/.github/workflows/build-python-package.yml b/.github/workflows/build-python-package.yml
index 67cbba6dd..b2565eb05 100644
--- a/.github/workflows/build-python-package.yml
+++ b/.github/workflows/build-python-package.yml
@@ -13,24 +13,25 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: [ubuntu-18.04, macos-10.15]
+        os: [ubuntu-latest, macos-latest, macos-13]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
 
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v5
       name: Install Python
       with:
-        python-version: '3.7'
+        python-version: '3.x'
 
     - name: Install cibuildwheel
       run: |
-        python -m pip install git+https://github.com/joerick/cibuildwheel.git@main
+        python -m pip install cibuildwheel
 
     - name: Install build tools for OSX
       if: startsWith(matrix.os, 'macos')
       run: |
         brew install automake
+        brew install libtool
 
     - name: Build wheels on Linux
       if: startsWith(matrix.os, 'macos') != true
@@ -42,30 +43,32 @@ jobs:
     - name: Build wheels on OSX
       if: startsWith(matrix.os, 'macos')
       env:
-        CIBW_BEFORE_BUILD: cd src/runtime/c && glibtoolize && autoreconf -i && ./configure && make && make install
+        CIBW_BEFORE_BUILD: cd src/runtime/c && glibtoolize && autoreconf -i && ./configure && make && sudo make install
       run: |
         python -m cibuildwheel src/runtime/python --output-dir wheelhouse
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
+        name: wheel-${{ matrix.os }}
         path: ./wheelhouse
 
   build_sdist:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v5
         name: Install Python
         with:
-          python-version: '3.7'
+          python-version: '3.10'
 
       - name: Build sdist
         run: cd src/runtime/python && python setup.py sdist
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
+          name: wheel-source
           path: ./src/runtime/python/dist/*.tar.gz
 
   upload_pypi:
@@ -75,24 +78,25 @@ jobs:
     if: github.ref == 'refs/heads/master' && github.event_name == 'push'
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: '3.x'
 
       - name: Install twine
         run: pip install twine
 
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         with:
-          name: artifact
+          pattern: wheel-*
+          merge-multiple: true
           path: ./dist
 
       - name: Publish
         env:
           TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.pypi_password }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
         run: |
-          (cd ./src/runtime/python && curl -I --fail https://pypi.org/project/$(python setup.py --name)/$(python setup.py --version)/) || twine upload dist/*
+          twine upload --verbose --non-interactive --skip-existing dist/*
\ No newline at end of file
diff --git a/doc/tutorial/gf-tutorial.t2t b/doc/tutorial/gf-tutorial.t2t
index 63407a38a..d58b93f16 100644
--- a/doc/tutorial/gf-tutorial.t2t
+++ b/doc/tutorial/gf-tutorial.t2t
@@ -1188,7 +1188,7 @@ use ``generate_trees = gt``.
   this wine is fresh
   this wine is warm
 ```
-The default **depth** is 3; the depth can be
+The default **depth** is 5; the depth can be
 set by using the ``depth`` flag:
 ```
   > generate_trees -depth=2 | l
@@ -1265,10 +1265,16 @@ Human eye may prefer to see a visualization: ``visualize_tree = vt``:
   > parse "this delicious cheese is very Italian" | visualize_tree
 ```
 The tree is generated in postscript (``.ps``) file. The ``-view`` option is used for
-telling what command to use to view the file. Its default is ``"open"``, which works
-on Mac OS X. On Ubuntu Linux, one can write
+telling what command to use to view the file.
+
+This works on Mac OS X:
 ```
-  > parse "this delicious cheese is very Italian" | visualize_tree -view="eog"
+  > parse "this delicious cheese is very Italian" | visualize_tree -view=open
+```
+On Linux, one can use one of the following commands.
+```
+  > parse "this delicious cheese is very Italian" | visualize_tree -view=eog
+  > parse "this delicious cheese is very Italian" | visualize_tree -view=xdg-open
 ```
 
 
@@ -1733,6 +1739,13 @@ A new module can **extend** an old one:
       Pizza : Kind ;
   }
 ```
+Note that the extended grammar doesn't inherit the start
+category from the grammar it extends, so if you want to
+generate sentences with this grammar, you'll have to either
+add a startcat (e.g. ``flags startcat = Question ;``),
+or in the GF shell, specify the category to ``generate_random`` or ``geneate_trees``
+(e.g. ``gr -cat=Comment`` or ``gt -cat=Question``).
+
 Parallel to the abstract syntax, extensions can
 be built for concrete syntaxes:
 ```
@@ -3733,7 +3746,7 @@ However, type-incorrect commands are rejected by the typecheck:
   The parsing is successful but the type checking failed with error(s):
     Couldn't match expected type Device light
        against the interred type Device fan
-    In the expression: DKindOne fan       
+    In the expression: DKindOne fan
 ```
 
 #NEW
@@ -4171,7 +4184,7 @@ division of integers.
 ```
   abstract Calculator = {
   flags startcat = Exp ;
-  
+
   cat Exp ;
 
   fun
@@ -4578,7 +4591,7 @@ in any multilingual grammar between any languages in the grammar.
 module Main where
 
 import PGF
-import System (getArgs)
+import System.Environment (getArgs)
 
 main :: IO ()
 main = do