diff --git a/.github/workflows/test_suite.yml b/.github/workflows/test_suite.yml
index cc2330b8..60b68a30 100644
--- a/.github/workflows/test_suite.yml
+++ b/.github/workflows/test_suite.yml
@@ -14,11 +14,11 @@ jobs:
       matrix:
         python-version: [3.8]
         #platform: [ubuntu-18.04, macos-latest]
-        platform: [ubuntu-20.04]
+        platform: [ubuntu-24.04]
     runs-on: ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Get LFS files
       run: git lfs pull
     # - name: Fix Conda permissions on macOS
@@ -28,8 +28,8 @@ jobs:
       run: |
         cd ..
         git clone https://github.com/next-exp/IC.git
- 
-    
+
+
     - name: Run tests
       run: |
         cd ..
@@ -38,4 +38,4 @@ jobs:
         source manage.sh work_in_python_version_no_tests ${{ matrix.python-version }}
         cd ../ICAROS
         source icaro_setup.sh
-        PYTEST_ADDOPTS=--color=yes HYPOTHESIS_PROFILE=travis-ci pytest -v
\ No newline at end of file
+        PYTEST_ADDOPTS=--color=yes HYPOTHESIS_PROFILE=travis-ci pytest -v
diff --git a/krcal/core/fit_lt_functions.py b/krcal/core/fit_lt_functions.py
index ecc5dde7..4fa72d84 100644
--- a/krcal/core/fit_lt_functions.py
+++ b/krcal/core/fit_lt_functions.py
@@ -274,7 +274,7 @@ def fit_lifetime_unbined(z       : np.array,
         logging.warn(f'Type error found in fit_lifetime_unbined: not enough events for fit')
         valid = False
 
-    except LinAlgError:
+    except SystemError:
         logging.warn(f'LinAlgError error found in fit_lifetime_unbined: not enough events for fit')
         valid = False