diff --git a/configs/hecate.tethys.yaml b/configs/hecate.tethys.yaml
index 04991a4..ab44955 100644
--- a/configs/hecate.tethys.yaml
+++ b/configs/hecate.tethys.yaml
@@ -29,7 +29,7 @@ ssh_node_hosts:
   titan-22: 192.168.22.22
   titan-24: 192.168.22.26
 ssh_node_users:
-  titan-24: tethys
+  titan-24: atlas
 ssh_managed_nodes:
   - titan-db
   - titan-0a
diff --git a/configs/hecate.titan-db.yaml b/configs/hecate.titan-db.yaml
index 697cac6..a0c0a7e 100644
--- a/configs/hecate.titan-db.yaml
+++ b/configs/hecate.titan-db.yaml
@@ -29,7 +29,7 @@ ssh_node_hosts:
   titan-22: 192.168.22.22
   titan-24: 192.168.22.26
 ssh_node_users:
-  titan-24: tethys
+  titan-24: atlas
 ssh_managed_nodes:
   - titan-db
   - titan-0a
diff --git a/scripts/install.sh b/scripts/install.sh
index a6e04e7..e7cffcd 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -180,6 +180,12 @@ migrate_hecate_config() {
     echo "[install] migrated runtime_safety_factor 1.10 -> 1.25 in ${CONF_DIR}/hecate.yaml"
     changed=1
   fi
+  if grep -Eq '^ssh_node_users:[[:space:]]*$' "${CONF_DIR}/hecate.yaml" \
+    && grep -Eq '^  titan-24:[[:space:]]*tethys[[:space:]]*$' "${CONF_DIR}/hecate.yaml"; then
+    sed -Ei 's/^  titan-24:[[:space:]]*tethys[[:space:]]*$/  titan-24: atlas/' "${CONF_DIR}/hecate.yaml"
+    echo "[install] migrated ssh_node_users titan-24 override to atlas"
+    changed=1
+  fi
 
   local role
   role="$(read_hecate_role)"