diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 0a5d1cf12..6879b26f7 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -9,22 +9,32 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04]
-        gcc_v: [7,8,9,10,11] # Version of GFortran we want to use.
+        os: [ubuntu-latest]
+        gcc_v: [12,10,11,9] # Version of GFortran we want to use.
         python-version: [3.11]
     env:
       FC: gfortran-${{matrix.gcc_v}}
       GCC_V: ${{matrix.gcc_v}}
 
+      #
+      # GCC version
+      #
+      #  9 - build.sh with documentation, unit tests and coverage analysis. doc deployment
+      #  10 - build.sh - no documentation, with and without unicode.
+      #  11 - FPM
+      #  12 - CMake build with unit tests, no documentation, with coverage analysis. no unicode
+      #
+      # NOTE: coverage disabled for now
+
     steps:
 
     - name: Checkout code
-      uses: actions/checkout@v4.1.6
+      uses: actions/checkout@v4.2.2
       with:
         submodules: recursive
 
     - name: Setup cmake
-      if: contains( matrix.gcc_v, 9 )
+      if: contains( matrix.gcc_v, 12 )
       uses: jwlawson/actions-setup-cmake@v2.0.2
       with:
         cmake-version: '3.28.x'
@@ -37,11 +47,24 @@ jobs:
     - name: Setup Graphviz
       uses: ts-graphviz/setup-graphviz@v2.0.2
 
+    - name: Set current directory in env variable
+      run: echo "MYDIR=$(pwd)" >> $GITHUB_ENV
+
+    - name: Set PYTHONPATH and PATH for later steps
+      run: |
+        echo "PYTHONPATH=$MYDIR/FoBiS/src/main/python:$PYTHONPATH" >> $GITHUB_ENV
+        echo "PATH=$MYDIR/FoBiS/src/main/python:$PATH" >> $GITHUB_ENV
+
     - name: Install Python dependencies
       if: contains( matrix.os, 'ubuntu')
       run: |
         python -m pip install --upgrade pip
-        pip install ford FoBiS.py pygooglechart fpm
+        #pip install ford FoBiS.py pygooglechart fpm
+        pip install ford pygooglechart fpm
+        # just get the latest FoBiS from git:
+        # git clone https://github.com/szaghi/FoBiS.git
+        # use a fork until there is a new release:
+        git clone https://github.com/jacobwilliams/FoBiS.git
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 
     - name: Install GFortran Linux
@@ -55,7 +78,7 @@ jobs:
         --slave /usr/bin/gcov gcov /usr/bin/gcov-${GCC_V}
 
     - name: Compile_with_build
-      if: matrix.gcc_v != 7 && matrix.gcc_v != 11
+      if: matrix.gcc_v == 10
       run: |
         GFORTRAN=gfortran-${{matrix.gcc_v}}
         GCOV=gcov-${{matrix.gcc_v}}
@@ -125,7 +148,7 @@ jobs:
       # CMake build with unit tests, no documentation, with coverage analysis
       # No unicode so that coverage combined with the build script will cover unicode
       # and non-unicode code paths
-      if: matrix.gcc_v == 9
+      if: matrix.gcc_v == 12
       run: |
         GFORTRAN=gfortran-${{matrix.gcc_v}}
         GCOV=gcov-${{matrix.gcc_v}}
@@ -137,15 +160,18 @@ jobs:
     - name: Compile_with_build_mkdocs
       # build with build.sh, make documentation, run unit tests
       # and perform coverage analysis - used for doc deployment
-      if: matrix.gcc_v == 7
+      if: matrix.gcc_v == 9
       run: |
         GFORTRAN=gfortran-${{matrix.gcc_v}}
         GCOV=gcov-${{matrix.gcc_v}}
         ./build.sh --coverage --skip-documentation
+        # delete old coverage files:
+        find . -name '*.gcda' -delete
+        find . -name '*.gcov' -delete
         ./build.sh --coverage --enable-unicode
 
     - name: Deploy Documentation for master
-      if: matrix.gcc_v == 7 && github.ref == 'refs/heads/master'
+      if: matrix.gcc_v == 9 && github.ref == 'refs/heads/master'
       uses: JamesIves/github-pages-deploy-action@v4.7.3
       with:
         branch: gh-pages # The branch the action should deploy to.
@@ -157,7 +183,7 @@ jobs:
     - name: Rebuild documentation for tagged release
       env:
         TAGNAME: ${{github.ref_name}}
-      if: matrix.gcc_v == 7 && startsWith(github.ref, 'refs/tags/')
+      if: matrix.gcc_v == 9 && startsWith(github.ref, 'refs/tags/')
       run: |
         echo ${TAGNAME}
         rm -rf doc
@@ -165,7 +191,7 @@ jobs:
         ford --debug json-fortran.tagged.md
 
     - name: Deploy documentation for tagged release
-      if: matrix.gcc_v == 7 && startsWith(github.ref, 'refs/tags/')
+      if: matrix.gcc_v == 9 && startsWith(github.ref, 'refs/tags/')
       uses: JamesIves/github-pages-deploy-action@v4.7.3
       with:
         branch: gh-pages # The branch the action should deploy to.
@@ -174,7 +200,7 @@ jobs:
         single-commit: true
 
     - name: Upload coverage
-      if: matrix.gcc_v == 7
+      if: matrix.gcc_v == 9
       run: |
         rm json_*.F90-*unicode.gcov || true
         mv json_*.F90.gcov src/
diff --git a/.gitignore b/.gitignore
index 88a038629..296ffeb4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,7 @@ My Inspector*
 x64/
 Debug/
 Release/
+/FoBiS
 
 # mac
 .DS_Store
\ No newline at end of file
diff --git a/src/json_value_module.F90 b/src/json_value_module.F90
index f2316645d..0e7d28de8 100644
--- a/src/json_value_module.F90
+++ b/src/json_value_module.F90
@@ -11599,7 +11599,9 @@ subroutine json_print_error_message(json,io_unit)
             write(io_unit,'(A)',iostat=istat) error_msg
             if (istat/=0) then
                 ! in this case, just try to write to the error_unit
-                call integer_to_string(io_unit,int_fmt,tmp)
+                ! [convert to IK integer, we assume this will be ok since
+                !  normally these io units are default ints]
+                call integer_to_string(int(io_unit,IK),int_fmt,tmp)
                 write(error_unit,'(A)',iostat=istat) 'Error writing to unit '//trim(tmp)
                 write(error_unit,'(A)',iostat=istat) error_msg
             end if