diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index b3844b2..e0e08ab 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -3,34 +3,27 @@ on: [push, pull_request]
 
 jobs:
   CI:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     defaults:
       run:
         shell: bash -l {0}
     strategy:
       matrix:
-        fortran-compiler:  [gfortran-9, gfortran-10]
+        gnu-compiler-version:  [10, 11, 12]
     env:
-      FC: ${{ matrix.fortran-compiler }}
+      FC: gfortran-${{ matrix.gnu-compiler-version }}
+      CC: gcc-${{ matrix.gnu-compiler-version }}
       FCFLAGS: "-ffree-line-length-none -m64 -std=f2008 -march=native -fbounds-check -finit-real=nan -g -DRTE_USE_CBOOL"
-      CC: gcc
-      NCHOME: /home/runner/netcdf-c
       NFHOME: /home/runner/netcdf-fortran
-      RFMIP_DIR: /home/runner/rfmip-files
     steps:
     - name: Update system packages
       run: sudo apt-get update
     ############################################################################
     #
     # Compilers....
-    #
-    # Gfortran 10 not available in Github CI stack, so install
-    #
-    - name: gfortran-10 setup compiler
-      if: contains(matrix.fortran-compiler, 'gfortran-10')
-      run: |
-        sudo apt-get install gfortran-10 gcc-10
-        echo "CC=gcc-10" >> $GITHUB_ENV
+    #    #
+    - name: install compilers
+      run: sudo apt-get install gfortran-${{ matrix.gnu-compiler-version }} gcc-${{ matrix.gnu-compiler-version }}
 
     ############################################################################
     #
@@ -38,30 +31,8 @@ jobs:
     #
     - name: Install HDF5 library
       run: |
-        sudo apt-get install libhdf5-dev libcurl4-gnutls-dev hdf5-helpers
-        dpkg -L libhdf5-dev
-
-    # Skipping this for now - netCDF configure doesn't see the HDF libararies
-    - name: cache-netcdf-c
-      id: cache-netcdf-c
-      uses: actions/cache@v3
-      with:
-        path: /home/runner/netcdf-c
-        key: netcdf-c-4.7.4a-${{ runner.os }}-${{ matrix.fortran-compiler }}
-
-    - name: Install netcdf C library from source
-      if: steps.cache-netcdf-c.outputs.cache-hit != 'true'
-      env:
-        CPPFLAGS: -I/usr/include/hdf5/serial
-        LDFLAGS: -L/usr/lib/x86_64-linux-gnu/hdf5/serial/
-      run: |
-        ${CC} --version
-        git clone https://github.com/Unidata/netcdf-c.git --branch v4.7.4
-        cd netcdf-c
-        ls /usr/include
-        ./configure --prefix=${NCHOME}
-        make -j
-        sudo make install
+        sudo apt-get install libhdf5-dev libcurl4-gnutls-dev hdf5-helpers libnetcdf-dev
+        dpkg -L libhdf5-dev libnetcdf-dev
 
     # Would be great to encode version info
     - name: cache-netcdf-fortran
@@ -69,14 +40,10 @@ jobs:
       uses: actions/cache@v3
       with:
         path: /home/runner/netcdf-fortran
-        key: netcdf-fortran-4.5.3-${{ runner.os }}-${{ matrix.fortran-compiler }}
+        key: netcdf-fortran-4.5.3-${{ runner.os }}-${{ matrix.fortran-compiler }}-1
 
     - name: Build NetCDF Fortran library
-      # Here too it would be nice to use the environment to specify netcdf-c location
       env:
-        CPPFLAGS: -I/home/runner/netcdf-c/include
-        LDFLAGS: -L/home/runner/netcdf-c/lib
-        LD_LIBRARY_PATH: /home/runner/netcdf-c/lib
         FCFLAGS: -fPIC
       if: steps.cache-netcdf-fortran.outputs.cache-hit != 'true'
       run: |