diff --git a/gaphas/aspect.py b/gaphas/aspect.py
index 45412e6..eea33b4 100644
--- a/gaphas/aspect.py
+++ b/gaphas/aspect.py
@@ -2,39 +2,13 @@
 
 Aspects form intermediate items between tools and items.
 """
-import warnings
-from functools import singledispatch as real_singledispatch
+from functools import singledispatch
 
 from gi.repository import Gdk
 
 from gaphas.item import Element
 
 
-def singledispatch(func):
-    """Wrapper around singledispatch(), with an extra compatibility function so
-    code will not break when upgrading from 1.0 to 1.1."""
-    wrapped = real_singledispatch(func)
-
-    def when_type(*types):
-        if not types:
-            raise TypeError("should provide at least one type")
-        warnings.warn(
-            "when_type: is deprecated, use `register` instead",
-            category=DeprecationWarning,
-            stacklevel=2,
-        )
-
-        def wrapper_for_types(func):
-            for cls in types:
-                wrapped.register(cls, func)
-            return func
-
-        return wrapper_for_types
-
-    wrapped.when_type = when_type  # type: ignore[attr-defined]
-    return wrapped
-
-
 class ItemFinder:
     """Find an item on the canvas."""
 
diff --git a/tests/test_singledispatch.py b/tests/test_singledispatch.py
deleted file mode 100644
index 0aa91c6..0000000
--- a/tests/test_singledispatch.py
+++ /dev/null
@@ -1,53 +0,0 @@
-import pytest
-
-from gaphas.aspect import singledispatch
-
-
-class Custom:
-    pass
-
-
-class Another:
-    pass
-
-
-@singledispatch
-def f(o):
-    return object, o
-
-
-@f.register(str)
-def _str_dispatcher(s):
-    return str, s
-
-
-@f.when_type(int)
-def _int_dispatcher(i):
-    return int, i
-
-
-@f.when_type(Custom, float)
-def _bool_float_dispatcher(i):
-    return Custom, i
-
-
-def test_singledispatch_with_registered_function():
-    assert (str, "abc") == f("abc")
-
-
-def test_singledispatch_with_when_type_function():
-    assert (int, 3) == f(3)
-
-
-def test_singledispatch_with_when_type_function_and_multiple_types():
-    custom = Custom()
-    assert (Custom, 3.0) == f(3.0)
-    assert (Custom, custom) == f(custom)
-
-
-def test_singledispatch_with_when_type_and_no_types():
-    with pytest.raises(TypeError):
-
-        @f.when_type()
-        def errorous():
-            pass