diff --git a/devtools/scripts/update_manifest.py b/devtools/scripts/update_manifest.py
index 6878eff91..5b7a63996 100644
--- a/devtools/scripts/update_manifest.py
+++ b/devtools/scripts/update_manifest.py
@@ -7,7 +7,6 @@
 from weldx.asdf.constants import (
     WELDX_EXTENSION_URI,
     WELDX_EXTENSION_VERSION,
-    WELDX_MANIFEST_URI,
 )
 from weldx.asdf.util import get_converter_for_tag