diff --git a/ape_addressbook/addressbook.py b/ape_addressbook/addressbook.py
index 9e5c5ef..c30adbe 100644
--- a/ape_addressbook/addressbook.py
+++ b/ape_addressbook/addressbook.py
@@ -26,12 +26,16 @@ def _validate_entries(entries: Dict) -> Dict:
 
 
 class AddressBookConfig(PluginConfig):
-    __root__: Dict[str, AddressType] = {}
-
     @root_validator(pre=True)
     def validate_entries(cls, entries):
         return _validate_entries(entries)
 
+    def __len__(self) -> int:
+        return len(self.dict())
+
+    class Config:
+        extra = "allow"
+
 
 class AddressBook(ManagerAccessMixin):
     """
@@ -67,7 +71,10 @@ def registry(self) -> Dict[str, AddressType]:
         and project addresses.
         """
 
-        return self.config.dict()
+        data = self.config.dict()
+
+        # Sorted for consistency's sake.
+        return {k: data[k] for k in sorted(data)}
 
     @property
     def aliases(self) -> Iterator[str]:
@@ -75,6 +82,7 @@ def aliases(self) -> Iterator[str]:
         An iterator over all aliases in the registry.
         """
 
+        # NOTE: self.registry is sorted.
         for alias in self.registry:
             yield alias
 
diff --git a/setup.py b/setup.py
index 57c75b8..0839db1 100644
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@
     include_package_data=True,
     install_requires=[
         "eth-ape>=0.6.0,<0.7",
-        "pydantic<2",
+        "pydantic",  # Use same version as eth-ape.
     ],
     python_requires=">=3.8,<4",
     extras_require=extras_require,
diff --git a/tests/test_addressbook.py b/tests/test_addressbook.py
index 21170e7..d112bf0 100644
--- a/tests/test_addressbook.py
+++ b/tests/test_addressbook.py
@@ -29,10 +29,9 @@ def test_aliases(project_alias_unchecksummed, project_alias_no_quotes):
     The aliases includes both project and global addresses.
     """
 
-    assert list(addressbook.aliases) == [
-        project_alias_unchecksummed,
-        project_alias_no_quotes,
-    ]
+    actual = list(addressbook.aliases)
+    expected = [project_alias_no_quotes, project_alias_unchecksummed]
+    assert actual == expected
 
 
 def test_contains(