diff --git a/TODO.md b/TODO.md
index 67dc72f18..aa0c134bd 100644
--- a/TODO.md
+++ b/TODO.md
@@ -95,6 +95,24 @@ Anything marked with **(!!!)** means a change *will* eventually be required.
     - [asyncio.run](https://docs.python.org/3.14/library/asyncio-runner.html#asyncio.run)
     - [asyncio.Runner](https://docs.python.org/3.14/library/asyncio-runner.html#asyncio.Runner)
 
+### Shutil
+
+#### rmtree
+
+- `onerror` deprecated and replaced with `onexc` in **Python 3.12**
+``` python
+    def excRemoveReadonly(func, path, exc: BaseException):
+        import stat
+        shared.log.debug(f'Exception during cleanup: {func} {path} {type(exc).__name__}')
+        if func in (os.rmdir, os.remove, os.unlink) and isinstance(exc, PermissionError):
+            shared.log.debug(f'Retrying cleanup: {path}')
+            os.chmod(path, stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)
+            func(path)
+    # ...
+      try:
+          shutil.rmtree(found.path, ignore_errors=False, onexc=excRemoveReadonly)
+```
+
 ## Code TODO
 
 > npm run todo
diff --git a/modules/ui_extensions.py b/modules/ui_extensions.py
index f1240a64c..640c0d622 100644
--- a/modules/ui_extensions.py
+++ b/modules/ui_extensions.py
@@ -191,10 +191,11 @@ def install_extension(extension_to_install, search_text, sort_column):
 
 
 def uninstall_extension(extension_path, search_text, sort_column):
-    def excRemoveReadonly(func, path, exc: Exception):
+    def errorRemoveReadonly(func, path, exc):
         import stat
-        shared.log.debug(f'Exception during cleanup: {func} {path} {type(exc).__name__}')
-        if func in (os.rmdir, os.remove, os.unlink) and isinstance(exc, PermissionError):
+        excvalue = exc[1]
+        shared.log.debug(f'Exception during cleanup: {func} {path} {excvalue.strerror}')
+        if func in (os.rmdir, os.remove, os.unlink) and excvalue.errno == errno.EACCES:
             shared.log.debug(f'Retrying cleanup: {path}')
             os.chmod(path, stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)
             func(path)
@@ -203,7 +204,7 @@ def uninstall_extension(extension_path, search_text, sort_column):
     if len(found) > 0 and os.path.isdir(extension_path):
         found = found[0]
         try:
-            shutil.rmtree(found.path, ignore_errors=False, onexc=excRemoveReadonly)
+            shutil.rmtree(found.path, ignore_errors=False, onerror=errorRemoveReadonly) # pylint: disable=deprecated-argument
             # extensions.extensions = [extension for extension in extensions.extensions if os.path.abspath(found.path) != os.path.abspath(extension_path)]
         except Exception as e:
             shared.log.warning(f'Extension uninstall failed: {found.path} {e}')