diff --git a/.github/workflows/regression_tests.yml b/.github/workflows/regression_tests.yml
index 0197469ef..1aea38bc4 100644
--- a/.github/workflows/regression_tests.yml
+++ b/.github/workflows/regression_tests.yml
@@ -17,7 +17,7 @@ jobs:
   regression_tests:
     name: Python ${{ matrix.python-version }}
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false  # false: try to complete all jobs
       matrix:
@@ -73,7 +73,7 @@ jobs:
 
       - name: Install Loki
         run: |
-          ./install --with-claw --with-ofp --with-tests --without-dace
+          ./install --with-ofp --with-tests --without-dace --without-claw
 
       - name: Install up-to-date CMake
         run: |
@@ -88,9 +88,7 @@ jobs:
       - name: Run CLOUDSC and ECWAM regression tests
         env:
           CLOUDSC_DIR: ${{ github.workspace }}/cloudsc
-          CLOUDSC_ARCH: ${{ github.workspace }}/cloudsc/arch/github/ubuntu/gnu/9.4.0
           CLOUDSC2_DIR: ${{ github.workspace }}/cloudsc2_tl_ad
-          CLOUDSC2_ARCH: ${{ github.workspace }}/cloudsc2_tl_ad/arch/github/ubuntu/gnu/9.4.0
           ECWAM_DIR: ${{ github.workspace }}/ecwam
           OMP_STACKSIZE: 4G
         run: |