diff --git a/.github/workflows/test_branches.yml b/.github/workflows/test_branches.yml
index c20fbc625b7..f3f19b78591 100644
--- a/.github/workflows/test_branches.yml
+++ b/.github/workflows/test_branches.yml
@@ -331,7 +331,7 @@ jobs:
         if test -z "${{matrix.slim}}"; then
             PYVER=$(echo "py${{matrix.python}}" | sed 's/\.//g')
             echo "Installing for $PYVER"
-            for PKG in 'cplex>=12.10' docplex gurobi xpress cyipopt pymumps scip; do
+            for PKG in 'cplex>=12.10' docplex 'gurobi=10.0.3' xpress cyipopt pymumps scip; do
                 echo ""
                 echo "*** Install $PKG ***"
                 # conda can literally take an hour to determine that a
diff --git a/.github/workflows/test_pr_and_main.yml b/.github/workflows/test_pr_and_main.yml
index 6349d8bb15e..13dc828c639 100644
--- a/.github/workflows/test_pr_and_main.yml
+++ b/.github/workflows/test_pr_and_main.yml
@@ -361,7 +361,7 @@ jobs:
         if test -z "${{matrix.slim}}"; then
             PYVER=$(echo "py${{matrix.python}}" | sed 's/\.//g')
             echo "Installing for $PYVER"
-            for PKG in 'cplex>=12.10' docplex gurobi xpress cyipopt pymumps scip; do
+            for PKG in 'cplex>=12.10' docplex 'gurobi=10.0.3' xpress cyipopt pymumps scip; do
                 echo ""
                 echo "*** Install $PKG ***"
                 # conda can literally take an hour to determine that a