diff --git a/temporalio/workflow.py b/temporalio/workflow.py
index 4485955a..b3ec30a3 100644
--- a/temporalio/workflow.py
+++ b/temporalio/workflow.py
@@ -803,7 +803,9 @@ def __init__(
             if name is not None and dynamic:
                 raise RuntimeError("Cannot provide name and dynamic boolean")
         self._fn = fn
-        self._name = name
+        self._name = (
+            name if name is not None else self._fn.__name__ if self._fn else None
+        )
         self._dynamic = dynamic
         if self._fn is not None:
             # Only bother to assign the definition if we are given a function. The function is not provided when
@@ -817,15 +819,8 @@ def __call__(self, fn: CallableSyncOrAsyncType):
         return self
 
     def _assign_defn(self) -> None:
-        chosen_name = (
-            self._name
-            if self._name is not None
-            else self._fn.__name__
-            if self._fn
-            else None
-        )
         assert self._fn is not None
-        self._defn = _UpdateDefinition(name=chosen_name, fn=self._fn, is_method=True)
+        self._defn = _UpdateDefinition(name=self._name, fn=self._fn, is_method=True)
 
     def validator(self, fn: Callable[..., None]):
         """Decorator for a workflow update validator method. Apply this decorator to a function to have it run before
@@ -1240,9 +1235,9 @@ async def with_object(*args, **kwargs) -> Any:
 def _assert_dynamic_handler_args(
     fn: Callable, arg_types: Optional[List[Type]], is_method: bool
 ) -> bool:
-    # Dynamic query/signal must have three args: self, name, and
-    # Sequence[RawValue]. An older form accepted varargs for the third param so
-    # we will too (but will warn in the signal/query code)
+    # Dynamic query/signal/update must have three args: self, name, and
+    # Sequence[RawValue]. An older form accepted varargs for the third param for signals/queries so
+    # we will too (but will warn in the signal/query code).
     params = list(inspect.signature(fn).parameters.values())
     total_expected_params = 3 if is_method else 2
     if (
diff --git a/tests/test_workflow.py b/tests/test_workflow.py
index e9851445..0b7ae6d2 100644
--- a/tests/test_workflow.py
+++ b/tests/test_workflow.py
@@ -19,6 +19,10 @@ def base_signal(self):
     def base_query(self):
         pass
 
+    @workflow.update
+    def base_update(self):
+        pass
+
 
 @workflow.defn(name="workflow-custom")
 class GoodDefn(GoodDefnBase):
@@ -50,6 +54,18 @@ def query2(self):
     def query3(self, name: str, args: Sequence[RawValue]):
         pass
 
+    @workflow.update
+    def update1(self):
+        pass
+
+    @workflow.update(name="update-custom")
+    def update2(self):
+        pass
+
+    @workflow.update(dynamic=True)
+    def update3(self, name: str, args: Sequence[RawValue]):
+        pass
+
 
 def test_workflow_defn_good():
     # Although the API is internal, we want to check the literal definition just
@@ -87,8 +103,21 @@ def test_workflow_defn_good():
                 name="base_query", fn=GoodDefnBase.base_query, is_method=True
             ),
         },
-        # TODO: Add
-        updates={},
+        # Since updates use class-based decorators we need to pass the inner _fn for the fn param
+        updates={
+            "update1": workflow._UpdateDefinition(
+                name="update1", fn=GoodDefn.update1._fn, is_method=True
+            ),
+            "update-custom": workflow._UpdateDefinition(
+                name="update-custom", fn=GoodDefn.update2._fn, is_method=True
+            ),
+            None: workflow._UpdateDefinition(
+                name=None, fn=GoodDefn.update3._fn, is_method=True
+            ),
+            "base_update": workflow._UpdateDefinition(
+                name="base_update", fn=GoodDefnBase.base_update._fn, is_method=True
+            ),
+        },
         sandboxed=True,
     )