diff --git a/src/python/jw/pkg/lib/Uri.py b/src/python/jw/pkg/lib/Uri.py
index 6c299b31..cada582e 100644
--- a/src/python/jw/pkg/lib/Uri.py
+++ b/src/python/jw/pkg/lib/Uri.py
@@ -1,7 +1,5 @@
 from __future__ import annotations
 
-import copy
-
 from functools import cached_property
 from typing import TYPE_CHECKING, override
 
@@ -149,7 +147,10 @@ class Uri:
         )
 
     def __new_with_path(self, base: str, path: str) -> Self:
-        ret = copy.deepcopy(self)
+        # -- Build a fresh instance rather than copying self: a copy would
+        # inherit computed cached_property values (e.g. __p, path, full),
+        # which would go stale as soon as __string is replaced below.
+        ret = object.__new__(type(self))
         ret.__string = base
         ret.__username = None
         ret.__password = None