diff --git a/.github/workflows/pr_master_test.yml b/.github/workflows/pr_master_test.yml
index 0524178..45a05ec 100644
--- a/.github/workflows/pr_master_test.yml
+++ b/.github/workflows/pr_master_test.yml
@@ -339,7 +339,7 @@ jobs:
         echo ""
         echo "Install Pyomo..."
         echo ""
-        $PYTHON_EXE -m pip install git+https://github.com/Pyomo/pyomo
+        $PYTHON_EXE -m pip install git+https://github.com/mrmundt/pyomo.git@pysp-fix
         echo ""
         echo "Install PySP..."
         echo ""