diff --git a/lib/docker_manager/upgrader.rb b/lib/docker_manager/upgrader.rb
index de640648..76c5f995 100644
--- a/lib/docker_manager/upgrader.rb
+++ b/lib/docker_manager/upgrader.rb
@@ -180,6 +180,7 @@ def run(cmd)
       http_proxy
       https_proxy
       no_proxy
+      EMBER_VERSION
     ]
 
     clear_env =