diff --git a/localtileserver/client.py b/localtileserver/client.py
index 4093d74..7a8fe88 100644
--- a/localtileserver/client.py
+++ b/localtileserver/client.py
@@ -417,7 +417,7 @@ def create_url(self, path: str, client: bool = False):
     def get_tile_url(
         self,
         indexes: Optional[List[int]] = None,
-        colormap: Optional[Union[str, Colormap]] = None,
+        colormap: Optional[Union[str, Colormap, List[str]]] = None,
         vmin: Optional[Union[float, List[float]]] = None,
         vmax: Optional[Union[float, List[float]]] = None,
         nodata: Optional[Union[int, float]] = None,
diff --git a/localtileserver/widgets.py b/localtileserver/widgets.py
index 1517ef2..23d7e77 100644
--- a/localtileserver/widgets.py
+++ b/localtileserver/widgets.py
@@ -24,7 +24,7 @@ def get_leaflet_tile_layer(
     port: Union[int, str] = "default",
     debug: bool = False,
     indexes: Optional[List[int]] = None,
-    colormap: Optional[Union[str, Colormap]] = None,
+    colormap: Optional[Union[str, Colormap, List[str]]] = None,
     vmin: Optional[Union[float, List[float]]] = None,
     vmax: Optional[Union[float, List[float]]] = None,
     nodata: Optional[Union[int, float]] = None,