diff --git a/internal-lab-setup-assets/gen-topo.py b/internal-lab-setup-assets/gen-topo.py
index 4bab5ed..da705f8 100644
--- a/internal-lab-setup-assets/gen-topo.py
+++ b/internal-lab-setup-assets/gen-topo.py
@@ -1,8 +1,8 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 import jinja2
 
 TEMPLATE_FILE = "workshop.clab.yml.j2"
-NUM_LABS = 30
+NUM_LABS = 18
 
 templateLoader = jinja2.FileSystemLoader(searchpath="./")
 templateEnv = jinja2.Environment(loader=templateLoader)