diff --git a/frontend/package.json b/frontend/package.json
index faf2df39..b7d892f6 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -4,7 +4,7 @@
     "url": "https://github.com/WorldWideTelescope/pywwt/issues"
   },
   "dependencies": {
-    "@jupyter-widgets/base": "^2  || ^3",
+    "@jupyter-widgets/base": "^2  || ^3 || ^4",
     "underscore": "^1"
   },
   "description": "AAS WorldWide Telescope from Python",
diff --git a/pywwt/annotation.py b/pywwt/annotation.py
index 8a3dc7f0..3093b9ff 100644
--- a/pywwt/annotation.py
+++ b/pywwt/annotation.py
@@ -45,7 +45,16 @@ def __init__(self, parent=None, **kwargs):
 
         self.parent._send_msg(event='annotation_create',
                               id=self.id, shape=self.shape)
-        super(Annotation, self).__init__(**kwargs)
+
+        # Normally we would pass the kwargs off to super().__init__(), but it
+        # seems that doing so bypasses the validation functions, which (at a
+        # minimum) causes problems for circles because it doesn't normalize
+        # their radius measurements to the proper units. Just apply the settings
+        # manually, which invokes the validation machinery properly.
+        super(Annotation, self).__init__()
+
+        for k, v in kwargs.items():
+            setattr(self, k, v)
 
         self.parent._annotation_set.add(self)
 
@@ -103,7 +112,7 @@ class Circle(Annotation):
     line_width = AstropyQuantity(1 * u.pixel,
                                  help='Assigns line width in pixels '
                                       '(:class:`~astropy.units.Quantity`)').tag(wwt='lineWidth')
-    radius = AstropyQuantity(80 * u.pixel,
+    radius = AstropyQuantity(1 * u.degree,
                              help='Sets the radius for the circle '
                                   '(:class:`~astropy.units.Quantity`)').tag(wwt='radius')