diff --git a/pyproject.toml b/pyproject.toml
index 9c3bd4f063..1512889db7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,6 +70,7 @@ dev = [
     "sphinx-design",
     "tox-direct",
     "types-mock",
+    "pyyaml",
 ]
 
 [project.scripts]
@@ -87,8 +88,8 @@ name = "Tom Cobb"
 write_to = "src/ophyd_async/_version.py"
 
 [tool.mypy]
-ignore_missing_imports = true                           # Ignore missing stubs in imported modules
-plugins = ["numpy.typing.mypy_plugin", "pydantic.mypy"]
+ignore_missing_imports = true          # Ignore missing stubs in imported modules
+plugins = ["numpy.typing.mypy_plugin"]
 
 [tool.isort]
 float_to_top = true