diff --git a/src/napari_matplotlib/base.py b/src/napari_matplotlib/base.py
index 720333e..ca69a54 100644
--- a/src/napari_matplotlib/base.py
+++ b/src/napari_matplotlib/base.py
@@ -42,7 +42,7 @@ def __init__(
         super().__init__(parent=parent)
         self.viewer = napari_viewer
         self.napari_theme_style_sheet = style_sheet_from_theme(
-            get_theme(napari_viewer.theme, as_dict=False)
+            get_theme(napari_viewer.theme)
         )
 
         # Sets figure.* style
@@ -84,7 +84,7 @@ def _on_napari_theme_changed(self, event: Event) -> None:
             Event that triggered the callback.
         """
         self.napari_theme_style_sheet = style_sheet_from_theme(
-            get_theme(event.value, as_dict=False)
+            get_theme(event.value)
         )
         self._replace_toolbar_icons()
 
@@ -97,7 +97,7 @@ def _napari_theme_has_light_bg(self) -> bool:
         bool
             True if theme's background colour has hsl lighter than 50%, False if darker.
         """
-        theme = napari.utils.theme.get_theme(self.viewer.theme, as_dict=False)
+        theme = napari.utils.theme.get_theme(self.viewer.theme)
         _, _, bg_lightness = theme.background.as_hsl_tuple()
         return bg_lightness > 0.5