diff --git a/pyproject.toml b/pyproject.toml
index f0d5357..6d263a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,9 @@ dynamic = ["version"]
 requires-python = ">=3.7"
 dependencies = [
     "sphinx>=4",
-    "traitlets>=4",
+    # FIXME: traitlets are upper bounded as a workaround to
+    #        https://github.com/jupyterhub/autodoc-traits/issues/55
+    "traitlets>=4,<5.10",
 ]
 
 [project.optional-dependencies]
diff --git a/tests/docs/sample_module.py b/tests/docs/sample_module.py
index 3738b24..c7c933f 100644
--- a/tests/docs/sample_module.py
+++ b/tests/docs/sample_module.py
@@ -5,7 +5,7 @@
 autodoc_traits against. It does not contain tests.
 """
 
-from traitlets import Bool
+from traitlets import Bool, Dict, Instance, Integer, Unicode, Union
 from traitlets.config.configurable import Configurable
 
 
@@ -81,3 +81,68 @@ def subclass_non_trait_property(self):
 
     def subclass_method(self):
         """subclass_method docstring"""
+
+
+class TraitTypesSampleConfigurable(Configurable):
+    """TraitTypesSampleConfigurable docstring"""
+
+    trait_integer = Integer(
+        help="""trait_integer help text""",
+        config=True,
+    )
+    trait_integer_nohelp = Integer(
+        config=True,
+    )
+    trait_integer_noconfig = Integer(
+        help="""trait_integer_noconfig help text""",
+    )
+
+    trait_unicode = Unicode(
+        help="""trait_unicode help text""",
+        config=True,
+    )
+    trait_unicode_nohelp = Unicode(
+        config=True,
+    )
+    trait_unicode_noconfig = Unicode(
+        help="""trait_unicode_noconfig help text""",
+    )
+
+    trait_dict = Dict(
+        help="""trait_dict help text""",
+        config=True,
+    )
+    trait_dict_nohelp = Dict(
+        config=True,
+    )
+    trait_dict_noconfig = Dict(
+        help="""trait_dict_noconfig help text""",
+    )
+
+    trait_instance = Instance(
+        klass=SampleConfigurable,
+        help="""trait_instance help text""",
+        config=True,
+    )
+    trait_instance_nohelp = Instance(
+        klass=SampleConfigurable,
+        config=True,
+    )
+    trait_instance_noconfig = Instance(
+        klass=SampleConfigurable,
+        help="""trait_instance_noconfig help text""",
+    )
+
+    trait_union = Union(
+        [Integer(), Unicode()],
+        help="""trait_union help text""",
+        config=True,
+    )
+    trait_union_nohelp = Union(
+        [Integer(), Unicode()],
+        config=True,
+    )
+    trait_union_noconfig = Union(
+        [Integer(), Unicode()],
+        help="""trait_union_noconfig help text""",
+    )
diff --git a/tests/docs/source/autotrait/help.rst b/tests/docs/source/autotrait/help.rst
index be5e876..8181b99 100644
--- a/tests/docs/source/autotrait/help.rst
+++ b/tests/docs/source/autotrait/help.rst
@@ -5,3 +5,18 @@ Test that we present the trait's provided ``help``.
 
 .. autotrait:: sample_module.SampleConfigurable.trait
    :noindex:
+
+.. autotrait:: sample_module.TraitTypesSampleConfigurable.trait_integer
+   :noindex:
+
+.. autotrait:: sample_module.TraitTypesSampleConfigurable.trait_unicode
+   :noindex:
+
+.. autotrait:: sample_module.TraitTypesSampleConfigurable.trait_dict
+   :noindex:
+
+.. autotrait:: sample_module.TraitTypesSampleConfigurable.trait_instance
+   :noindex:
+
+.. autotrait:: sample_module.TraitTypesSampleConfigurable.trait_union
+   :noindex:
diff --git a/tests/test_autodoc_traits.py b/tests/test_autodoc_traits.py
index 7018f46..063d6f5 100644
--- a/tests/test_autodoc_traits.py
+++ b/tests/test_autodoc_traits.py
@@ -99,6 +99,7 @@ def test_sphinx_build_all_docs(temp_docs_dir, monkeypatch):
                 "SampleConfigurableSubclass docstring",
                 "SampleNonConfigurable docstring",
                 "SampleNonConfigurableSubclass docstring",
+                "TraitTypesSampleConfigurable docstring",
             ],
             [],
         ),
@@ -107,6 +108,11 @@ def test_sphinx_build_all_docs(temp_docs_dir, monkeypatch):
             [
                 "c.SampleConfigurable.trait",
                 "trait help text",
+                "trait_integer help text",
+                "trait_unicode help text",
+                "trait_dict help text",
+                "trait_instance help text",
+                "trait_union help text",
             ],
             [],
         ),