diff --git a/pyproject.toml b/pyproject.toml
index c3e47168..b6ccfaba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,6 +57,7 @@ optional-dependencies.dev = [
     "pyright==1.1.408",
     "pyroma==5.0.1",
     "pytest==9.0.3",
+    "pytest-beartype-tests",
     "pytest-cov==7.1.0",
     "pytest-regressions==2.10.0",
     "ruff==0.15.11",
@@ -83,6 +84,9 @@ urls.Documentation = "https://vws-python.github.io/vws-web-tools/"
 urls.Source = "https://github.com/VWS-Python/vws-web-tools"
 scripts.vws-web-tools = "vws_web_tools:vws_web_tools_group"
 
+[dependency-groups]
+dev = []
+
 [tool.setuptools]
 zip-safe = false
 package-data.vws_web_tools = [
@@ -103,6 +107,9 @@ bdist_wheel.universal = true
 # Code to match this is in ``conf.py``.
 version_scheme = "post-release"
 
+[tool.uv]
+sources.pytest-beartype-tests = { git = "https://github.com/adamtheturtle/pytest-beartype-tests.git", rev = "bc81d99" }
+
 [tool.ruff]
 line-length = 79
 lint.select = [
@@ -326,7 +333,6 @@ ignore_path = [
 ignore_names = [
     # pytest configuration
     "pytest_collect_file",
-    "pytest_collection_modifyitems",
     "pytest_plugins",
     # pytest fixtures - we name fixtures like this for this purpose
     "fixture_*",
diff --git a/tests/conftest.py b/tests/conftest.py
index a5af6707..ab5b7cf9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,7 +3,6 @@
 import os
 
 import pytest
-from beartype import beartype
 
 from tests.credentials import VWSCredentials
 
@@ -15,16 +14,3 @@ def fixture_vws_credentials() -> VWSCredentials:
         email_address=os.environ["VWS_EMAIL_ADDRESS"],
         password=os.environ["VWS_PASSWORD"],
     )
-
-
-@beartype
-def pytest_collection_modifyitems(
-    session: pytest.Session,
-    config: pytest.Config,
-    items: list[pytest.Item],
-) -> None:
-    """Apply the beartype decorator to all collected test functions."""
-    del session, config
-    for item in items:
-        assert isinstance(item, pytest.Function)
-        item.obj = beartype(obj=item.obj)