diff --git a/refactor/ast.py b/refactor/ast.py
index 3d23262..be90edb 100644
--- a/refactor/ast.py
+++ b/refactor/ast.py
@@ -107,7 +107,14 @@ def unparse(self, node: ast.AST) -> str:
         ...  # pragma: no cover
 
 
-class BaseUnparser(ast._Unparser):  # type: ignore
+try:
+    _UnparserBase = ast._Unparser
+except AttributeError:
+    # Python 3.14+: _Unparser moved to C extension module
+    from _ast_unparse import Unparser as _UnparserBase  # type: ignore[import-not-found]
+
+
+class BaseUnparser(_UnparserBase):  # type: ignore
     """A public :py:class:`ast._Unparser` API that can
     be used to customize the AST re-synthesis process."""