diff --git a/playbooks/legacy/grenade-dsvm-ironic-multinode-multitenant/run.yaml b/playbooks/legacy/grenade-dsvm-ironic-multinode-multitenant/run.yaml
index 0a32558035..c8ab144847 100644
--- a/playbooks/legacy/grenade-dsvm-ironic-multinode-multitenant/run.yaml
+++ b/playbooks/legacy/grenade-dsvm-ironic-multinode-multitenant/run.yaml
@@ -65,6 +65,7 @@
             export DEVSTACK_GATE_TEMPEST_BAREMETAL_BUILD_TIMEOUT=1200
             export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_BUILD_DEPLOY_RAMDISK=False"
             export DEVSTACK_GATE_TLSPROXY=0
+            export DEVSTACK_GATE_USE_PYTHON3=True
             export BUILD_TIMEOUT
 
             export GRENADE_PLUGINRC+=$'\n'"enable_grenade_plugin networking-generic-switch https://opendev.org/openstack/networking-generic-switch"
diff --git a/playbooks/legacy/grenade-dsvm-ironic/run.yaml b/playbooks/legacy/grenade-dsvm-ironic/run.yaml
index f001c531df..5609efed35 100644
--- a/playbooks/legacy/grenade-dsvm-ironic/run.yaml
+++ b/playbooks/legacy/grenade-dsvm-ironic/run.yaml
@@ -36,6 +36,7 @@
             export DEVSTACK_GATE_TEMPEST_BAREMETAL_BUILD_TIMEOUT=1200
             export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_BUILD_DEPLOY_RAMDISK=False"
             export DEVSTACK_GATE_TLSPROXY=0
+            export DEVSTACK_GATE_USE_PYTHON3=True
             export BUILD_TIMEOUT
 
             # Standardize VM size for each supported ramdisk