diff --git a/nbs/99_templates.ipynb b/nbs/99_templates.ipynb
index 52701c1..9706a39 100644
--- a/nbs/99_templates.ipynb
+++ b/nbs/99_templates.ipynb
@@ -167,7 +167,7 @@
    "source": [
     "# | exporti\n",
     "class TemplateRenderer:\n",
-    "    def render(self, template: str | None = None, **kwargs: Any) -> str:\n",
+    "    def render(self, template: Optional[str] = None, **kwargs: Any) -> str:\n",
     "        if template is None:\n",
     "            raise RuntimeError(\"Missing template\")\n",
     "        return render_to_remove(template, **kwargs)"
diff --git a/sal/templates.py b/sal/templates.py
index eb78f47..bea2839 100644
--- a/sal/templates.py
+++ b/sal/templates.py
@@ -43,7 +43,7 @@ def render_to_remove(
 
 # %% ../nbs/99_templates.ipynb 11
 class TemplateRenderer:
-    def render(self, template: str | None = None, **kwargs: Any) -> str:
+    def render(self, template: Optional[str] = None, **kwargs: Any) -> str:
         if template is None:
             raise RuntimeError("Missing template")
         return render_to_remove(template, **kwargs)