diff --git a/microbootstrap/instruments/base.py b/microbootstrap/instruments/base.py
index 8de64a6..fdb5987 100644
--- a/microbootstrap/instruments/base.py
+++ b/microbootstrap/instruments/base.py
@@ -13,7 +13,7 @@
 
 
 class BaseInstrumentConfig(pydantic.BaseModel):
-    pass
+    model_config = pydantic.ConfigDict(arbitrary_types_allowed=True)
 
 
 @dataclasses.dataclass