diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 256622ae1..c06fcd9fc 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -56,7 +56,7 @@ jobs:
       with:
          repository: opensim-org/opensim-core
          path: 'opensim-core'
-         ref: fix_cmctaskset_copy
+         ref: feature_add-mesh-refcounting
          depth: 1
     
     - name: Cache opensim-core-dependencies
@@ -142,7 +142,7 @@ jobs:
         makensis.exe make_installer.nsi
         mv OpenSim-${{ steps.build-gui.outputs.version }}-win64.exe $env:GITHUB_WORKSPACE
     - name: Upload GUI installer
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: OpenSim-${{ steps.build-gui.outputs.version }}-win64
         path: OpenSim-${{ steps.build-gui.outputs.version }}-win64.exe
@@ -161,7 +161,7 @@ jobs:
       with:
          repository: opensim-org/opensim-core
          path: 'opensim-core'
-         ref: fix_cmctaskset_copy
+         ref: feature_add-mesh-refcounting
          
     - uses: actions/setup-python@v4
       with:
@@ -296,7 +296,7 @@ jobs:
         mv Gui/opensim/dist/OpenSim-$VERSION.pkg $GITHUB_WORKSPACE
 
     - name: Upload GUI installer
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: OpenSim-${{ steps.build-gui.outputs.version }}-mac
         path: OpenSim-${{ steps.build-gui.outputs.version }}.pkg
@@ -316,7 +316,7 @@ jobs:
       with:
          repository: opensim-org/opensim-core
          path: 'opensim-core'
-         ref: fix_cmctaskset_copy
+         ref: feature_add-mesh-refcounting
          
     - name: Install packages
       run: sudo apt-get update && sudo apt-get install --yes liblapack-dev freeglut3-dev libxi-dev libxmu-dev doxygen python3 python3-dev python3-numpy python3-setuptools gfortran-7
@@ -424,7 +424,7 @@ jobs:
         mv Gui/opensim/dist/OpenSim-$VERSION.tar.gz $GITHUB_WORKSPACE
 
     - name: Upload GUI installer
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: OpenSim-${{ steps.build-gui.outputs.version }}-ub20-linux
         path: OpenSim-${{ steps.build-gui.outputs.version }}.tar.gz