diff --git a/nbs/03_cli.ipynb b/nbs/03_cli.ipynb
index f1e1f33..6c98956 100644
--- a/nbs/03_cli.ipynb
+++ b/nbs/03_cli.ipynb
@@ -55,7 +55,7 @@
     "# | export\n",
     "import click\n",
     "from pathlib import Path\n",
-    "from typing import Any\n",
+    "from typing import Any, Union\n",
     "from sal.codegen import Sal\n",
     "from sal.utils import is_notebook"
    ]
@@ -92,7 +92,7 @@
     "\n",
     "# TODO support filters from config file\n",
     "\n",
-    "def _render(file: str, directories: list[Path]) -> str | Any:\n",
+    "def _render(file: str, directories: list[Path]) -> Union[str, Any]:\n",
     "    sal = Sal.from_config(template_directories=directories)\n",
     "    return sal.process_xml_from_filename(file)"
    ]
diff --git a/sal/cli.py b/sal/cli.py
index 66c2843..47f3d8a 100644
--- a/sal/cli.py
+++ b/sal/cli.py
@@ -6,7 +6,7 @@
 # %% ../nbs/03_cli.ipynb 4
 import click
 from pathlib import Path
-from typing import Any
+from typing import Any, Union
 from .codegen import Sal
 from .utils import is_notebook
 
@@ -14,7 +14,7 @@
 # TODO support filters from config file
 
 
-def _render(file: str, directories: list[Path]) -> str | Any:
+def _render(file: str, directories: list[Path]) -> Union[str, Any]:
     sal = Sal.from_config(template_directories=directories)
     return sal.process_xml_from_filename(file)