diff --git a/builder/penv_setup.py b/builder/penv_setup.py
index 63ae11e..b5ea0b9 100644
--- a/builder/penv_setup.py
+++ b/builder/penv_setup.py
@@ -90,7 +90,7 @@ def has_internet_connection(timeout=5):
             pass
 
     # 2) Test direct TCP connectivity to common HTTPS endpoints (port 443).
-    https_hosts = ("pioduino.netmesvoip.ru")
+    https_hosts = ("pypi.org", "files.pythonhosted.org", "github.com","pioduino.netmesvoip.ru")
     for host in https_hosts:
         try:
             socket.create_connection((host, 443), timeout=timeout).close()