diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index f768fe953..d31674e05 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -21,6 +21,9 @@ jobs:
     steps:
     - name: Checkout opensim-gui
       uses: actions/checkout@v2
+      with:
+         repository: opensim-org/opensim-gui
+         ref: 4.3
 
     - name: Install SWIG
       run: choco install swig --version 4.0.2 --yes --limit-output --allow-downgrade
@@ -150,6 +153,9 @@ jobs:
     steps:
     - name: Checkout opensim-gui
       uses: actions/checkout@v2
+      with:
+         repository: opensim-org/opensim-gui
+         ref: 4.3
 
     - name: Checkout opensim-core master
       uses: actions/checkout@v2
@@ -297,7 +303,10 @@ jobs:
 
     - name: Checkout opensim-gui
       uses: actions/checkout@v2
-      
+      with:
+         repository: opensim-org/opensim-gui
+         ref: 4.3
+
     - name: Checkout opensim-core master
       uses: actions/checkout@v2
       with: