diff --git a/bump_pydantic/codemods/replace_config.py b/bump_pydantic/codemods/replace_config.py
index 98f71bc..7c3e14f 100644
--- a/bump_pydantic/codemods/replace_config.py
+++ b/bump_pydantic/codemods/replace_config.py
@@ -90,16 +90,17 @@ def visit_Assign(self, node: cst.Assign) -> None:
         self.assign_value = node.value
 
     def visit_AssignTarget(self, node: cst.AssignTarget) -> None:
-        self.config_args.append(
-            cst.Arg(
-                keyword=node.target,  # type: ignore[arg-type]
-                value=self.assign_value,
-                equal=cst.AssignEqual(
-                    whitespace_before=cst.SimpleWhitespace(""),
-                    whitespace_after=cst.SimpleWhitespace(""),
-                ),
+        if self.inside_config_class:
+            self.config_args.append(
+                cst.Arg(
+                    keyword=node.target,  # type: ignore[arg-type]
+                    value=self.assign_value,
+                    equal=cst.AssignEqual(
+                        whitespace_before=cst.SimpleWhitespace(""),
+                        whitespace_after=cst.SimpleWhitespace(""),
+                    ),
+                )
             )
-        )
 
     def leave_Module(self, original_node: Module, updated_node: Module) -> Module:
         return updated_node
diff --git a/tests/test_replace_config.py b/tests/test_replace_config.py
index 2194789..3f1addb 100644
--- a/tests/test_replace_config.py
+++ b/tests/test_replace_config.py
@@ -40,3 +40,30 @@ class Config:
             allow_arbitrary_types = True
         """
         self.assertCodemod(code, code)
+
+    def test_reset_config_args(self) -> None:
+        before = """
+        from pydantic import BaseModel
+
+        class Potato(BaseModel):
+            class Config:
+                allow_arbitrary_types = True
+
+        potato = Potato()
+
+        class Potato2(BaseModel):
+            class Config:
+                allow_mutation = True
+        """
+        after = """
+        from pydantic import ConfigDict, BaseModel
+
+        class Potato(BaseModel):
+            model_config = ConfigDict(allow_arbitrary_types=True)
+
+        potato = Potato()
+
+        class Potato2(BaseModel):
+            model_config = ConfigDict(allow_mutation=True)
+        """
+        self.assertCodemod(before, after)