diff --git a/pycrostates/segmentation/tests/test_transitions.py b/pycrostates/segmentation/tests/test_transitions.py
index 563fdc9f..ef607feb 100644
--- a/pycrostates/segmentation/tests/test_transitions.py
+++ b/pycrostates/segmentation/tests/test_transitions.py
@@ -143,17 +143,3 @@ def test_check_labels_n_clusters():
         _check_labels_n_clusters(np.random.randint(0, 5, size=100).astype(float), 5)
     with pytest.raises(ValueError, match=re.escape("'[6 7]' are invalid")):
         _check_labels_n_clusters(np.random.randint(0, 8, size=100), 6)
-
-
-def test_deprecated_ignore_self():
-    labels = np.random.randint(0, 5, size=100)
-
-    with pytest.warns(DeprecationWarning, match="is deprecated and will be removed"):
-        M = compute_transition_matrix(labels, 5, ignore_self=True)
-    M_ = compute_transition_matrix(labels, 5, ignore_repetitions=True)
-    assert_allclose(M, M_)
-
-    with pytest.warns(DeprecationWarning, match="is deprecated and will be removed"):
-        M = compute_expected_transition_matrix(labels, 5, ignore_self=True)
-    M_ = compute_expected_transition_matrix(labels, 5, ignore_repetitions=True)
-    assert_allclose(M, M_)
diff --git a/pycrostates/utils/_fixes.py b/pycrostates/utils/_fixes.py
index f5bd5635..579aebce 100644
--- a/pycrostates/utils/_fixes.py
+++ b/pycrostates/utils/_fixes.py
@@ -1,7 +1,6 @@
 """Temporary bug-fixes awaiting an upstream fix."""
 
 import sys
-from warnings import warn
 
 
 # https://github.com/sphinx-gallery/sphinx-gallery/issues/1112
@@ -19,13 +18,3 @@ def __getattr__(self, name):  # noqa: D105
             return getattr(sys.stdout, name)
         else:
             raise AttributeError(f"'file' object has not attribute '{name}'")
-
-
-def deprecate(old: str, new: str) -> None:
-    """Warn about deprecation of an argument."""
-    warn(
-        f"The '{old}' argument is deprecated and will be removed in future "
-        f"versions. Please use '{new}' instead.",
-        DeprecationWarning,
-        stacklevel=2,
-    )