diff --git a/pyproject.toml b/pyproject.toml
index addea61e..c6728a0a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ dynamic = ["version"]
 
 requires-python = ">=3.8"
 dependencies = [
-    "beartype >= 0.16",
+    "beartype>=0.16.2",
     "typing-extensions; python_version<='3.10'",
 ]
 
diff --git a/tests/test_parametric.py b/tests/test_parametric.py
index 94e4c3ab..ec58ab0f 100644
--- a/tests/test_parametric.py
+++ b/tests/test_parametric.py
@@ -521,7 +521,9 @@ class MockVal:
 
 
 def test_init_subclass_correct_args():
-    # See issue https://github.com/beartype/plum/issues/105
+    # See the following issue:
+    #
+    #   https://github.com/beartype/plum/issues/105
 
     from plum import parametric
 
@@ -529,10 +531,8 @@ def test_init_subclass_correct_args():
 
     class Pytree:
         def __init_subclass__(cls, **kwargs):
-            if cls in register:
-                raise ValueError("duplicate")
-            else:
-                register.add(cls)
+            assert cls not in register, "Duplicate!"
+            register.add(cls)
 
     @parametric
     class Wrapper(Pytree):