diff --git a/.github/workflows/install-from-conda.yml b/.github/workflows/install-from-conda.yml
index 2e0167db20..43784fcec0 100644
--- a/.github/workflows/install-from-conda.yml
+++ b/.github/workflows/install-from-conda.yml
@@ -44,7 +44,7 @@ jobs:
           esmvaltool version 2>&1 | tee conda_install_linux_artifacts_python_${{ matrix.python-version }}/version.txt
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Conda_Install_Linux_python_${{ matrix.python-version }}
           path: conda_install_linux_artifacts_python_${{ matrix.python-version }}
@@ -83,7 +83,7 @@ jobs:
 #      - run: esmvaltool version 2>&1 | tee conda_install_osx_artifacts_python_${{ matrix.python-version }}/version.txt
 #      - name: Upload artifacts
 #        if: ${{ always() }}  # upload artifacts even if fail
-#        uses: actions/upload-artifact@v4
+#        uses: actions/upload-artifact@v5
 #        with:
 #          name: Conda_Install_OSX_python_${{ matrix.python-version }}
 #          path: conda_install_osx_artifacts_python_${{ matrix.python-version }}
diff --git a/.github/workflows/install-from-condalock-file.yml b/.github/workflows/install-from-condalock-file.yml
index b60c296fea..8a4ebeb1cc 100644
--- a/.github/workflows/install-from-condalock-file.yml
+++ b/.github/workflows/install-from-condalock-file.yml
@@ -58,7 +58,7 @@ jobs:
       - run: pytest -n 2 -m "not installation"
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Source_Install_Linux_python_${{ matrix.python-version }}
           path: source_install_linux_artifacts_python_${{ matrix.python-version }}
diff --git a/.github/workflows/install-from-source.yml b/.github/workflows/install-from-source.yml
index 118e5f4a59..3b78efd02b 100644
--- a/.github/workflows/install-from-source.yml
+++ b/.github/workflows/install-from-source.yml
@@ -48,7 +48,7 @@ jobs:
           esmvaltool version 2>&1 | tee source_install_linux_artifacts_python_${{ matrix.python-version }}/version.txt
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Source_Install_Linux_python_${{ matrix.python-version }}
           path: source_install_linux_artifacts_python_${{ matrix.python-version }}
@@ -81,7 +81,7 @@ jobs:
 #      - run: esmvaltool version 2>&1 | tee source_install_osx_artifacts_python_${{ matrix.python-version }}/version.txt
 #      - name: Upload artifacts
 #        if: ${{ always() }}  # upload artifacts even if fail
-#        uses: actions/upload-artifact@v4
+#        uses: actions/upload-artifact@v5
 #        with:
 #          name: Source_Install_OSX_python_${{ matrix.python-version }}
 #          path: source_install_osx_artifacts_python_${{ matrix.python-version }}
diff --git a/.github/workflows/run-tests-monitor.yml b/.github/workflows/run-tests-monitor.yml
index a859efb89b..7e7dc603e5 100644
--- a/.github/workflows/run-tests-monitor.yml
+++ b/.github/workflows/run-tests-monitor.yml
@@ -57,7 +57,7 @@ jobs:
         run: python tests/parse_pymon.py
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Test_Linux_python_${{ matrix.python-version }}
           path: test_linux_artifacts_python_${{ matrix.python-version }}
@@ -108,7 +108,7 @@ jobs:
         run: python tests/parse_pymon.py
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Test_OSX_python_${{ matrix.python-version }}
           path: test_osx_artifacts_python_${{ matrix.python-version }}
diff --git a/.github/workflows/test-development.yml b/.github/workflows/test-development.yml
index 68eaf22f36..1d84c0cc9a 100644
--- a/.github/workflows/test-development.yml
+++ b/.github/workflows/test-development.yml
@@ -60,7 +60,7 @@ jobs:
         run: pytest -n 2 -m "not installation" 2>&1 | tee develop_test_linux_artifacts_python_${{ matrix.python-version }}/test_report.txt
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Develop_Test_Linux_python_${{ matrix.python-version }}
           path: develop_test_linux_artifacts_python_${{ matrix.python-version }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ffd2ae35bd..1348402a09 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -58,7 +58,7 @@ jobs:
         run: pytest -n 2 -m "not installation" 2>&1 | tee test_linux_artifacts_python_${{ matrix.python-version }}/test_report.txt
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Test_Linux_python_${{ matrix.python-version }}
           path: test_linux_artifacts_python_${{ matrix.python-version }}
@@ -110,7 +110,7 @@ jobs:
         run: pytest -n 2 -m "not installation" 2>&1 | tee test_osx_artifacts_python_${{ matrix.python-version }}/test_report.txt
       - name: Upload artifacts
         if: ${{ always() }}  # upload artifacts even if fail
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: Test_OSX_python_${{ matrix.python-version }}
           path: test_osx_artifacts_python_${{ matrix.python-version }}