diff --git a/tools/gemcall b/tools/gemcall
index 378a892..ab16e95 100755
--- a/tools/gemcall
+++ b/tools/gemcall
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.9
 
 import socket
 import urllib.parse as up