diff --git a/util.py b/util.py
index bfec1ed..5147757 100644
--- a/util.py
+++ b/util.py
@@ -132,6 +132,7 @@ def check_update(current_version):
 
 
 def update(current_version):
+    return "Can't update Nix installation at runtime"
     global log
 
     target = var.config.get('bot', 'target_version')