diff --git a/django/contrib/gis/forms/widgets.py b/django/contrib/gis/forms/widgets.py
index 82d9f26b1c..df5cd9b3f0 100644
--- a/django/contrib/gis/forms/widgets.py
+++ b/django/contrib/gis/forms/widgets.py
@@ -63,15 +63,16 @@ class BaseGeometryWidget(Widget):
         if attrs is None:
             attrs = {}
 
-        context.update(self.build_attrs(self.attrs, dict(
-            name=name,
-            module='geodjango_%s' % name.replace('-', '_'),  # JS-safe
-            serialized=self.serialize(value),
-            geom_type=gdal.OGRGeomType(self.attrs['geom_type']),
-            STATIC_URL=settings.STATIC_URL,
-            LANGUAGE_BIDI=translation.get_language_bidi(),
-            **attrs
-        )))
+        build_attrs_kwargs = {
+            'name': name,
+            'module': 'geodjango_%s' % name.replace('-', '_'),  # JS-safe
+            'serialized': self.serialize(value),
+            'geom_type': gdal.OGRGeomType(self.attrs['geom_type']),
+            'STATIC_URL': settings.STATIC_URL,
+            'LANGUAGE_BIDI': translation.get_language_bidi(),
+        }
+        build_attrs_kwargs.update(attrs)
+        context.update(self.build_attrs(self.attrs, build_attrs_kwargs))
         return context
 
 
diff --git a/docs/releases/1.11.1.txt b/docs/releases/1.11.1.txt
index fd54a603a2..1d0b70f76b 100644
--- a/docs/releases/1.11.1.txt
+++ b/docs/releases/1.11.1.txt
@@ -66,3 +66,6 @@ Bugfixes
 
 * Updated the ``contrib.postgres`` ``SplitArrayWidget`` to use template-based
   widget rendering (:ticket:`28040`).
+
+* Fixed crash in ``BaseGeometryWidget.get_context()`` when overriding existing
+  ``attrs`` (:ticket:`28105`).
diff --git a/tests/gis_tests/test_geoforms.py b/tests/gis_tests/test_geoforms.py
index 73521bc2e6..91bfc173f5 100644
--- a/tests/gis_tests/test_geoforms.py
+++ b/tests/gis_tests/test_geoforms.py
@@ -1,6 +1,7 @@
 import re
 
 from django.contrib.gis import forms
+from django.contrib.gis.forms import BaseGeometryWidget
 from django.contrib.gis.geos import GEOSGeometry
 from django.forms import ValidationError
 from django.test import SimpleTestCase, override_settings, skipUnlessDBFeature
@@ -353,6 +354,12 @@ class OSMWidgetTest(SimpleTestCase):
 @skipUnlessDBFeature("gis_enabled")
 class GeometryWidgetTests(SimpleTestCase):
 
+    def test_get_context_attrs(self):
+        """The Widget.get_context() attrs argument overrides self.attrs."""
+        widget = BaseGeometryWidget(attrs={'geom_type': 'POINT'})
+        context = widget.get_context('point', None, attrs={'geom_type': 'POINT2'})
+        self.assertEqual(context['geom_type'], 'POINT2')
+
     def test_subwidgets(self):
         widget = forms.BaseGeometryWidget()
         self.assertEqual(