diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 12180a188..45e0fa605 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -57,7 +57,7 @@ jobs:
       - name: Make check
         run: opam exec -- make --jobs=2 check
       - name: Archive documentation
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         if: matrix.ocaml-compiler == '4.14.x' && matrix.additional-packages == ''
         with:
           name: doc
@@ -121,14 +121,14 @@ jobs:
           mv build/Kappapp.tar.gz .
           mv build/site .
       - name: Archive Javascript app
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: online-ui
           path: |
             site
             viz
       - name: Archive linux electron app
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: linux
           path: |
@@ -159,7 +159,7 @@ jobs:
           codesign -s - Kappapp.app
           zip -y -r Kappapp.app.zip Kappapp.app
       - name: Archive MacOS app
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: macos
           path: Kappapp.app.zip
@@ -186,7 +186,7 @@ jobs:
           # Note: Windows VMs on GitHub Action do not have zip command but provide 7z
           7z a -tzip KappappWin.zip KappappWin
       - name: Archive Windows app
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: windows
           path: KappappWin.zip
@@ -248,13 +248,13 @@ jobs:
 #      run: |
 #        # export DISPLAY=:99 # needed for electron
 #        DEBUG=pw:browser* npx playwright test --retries=2 --trace retain-on-first-failure
-#    - uses: actions/upload-artifact@v4
+#    - uses: actions/upload-artifact@v6
 #      if: ${{ !cancelled() }}
 #      with:
 #        name: playwright-report
 #        path: playwright-report/
 #        retention-days: 30
-    # - uses: actions/upload-artifact@v4
+    # - uses: actions/upload-artifact@v6
     #   if: ${{ !cancelled() }}
     #   with:
     #     name: xvfb_log