diff --git a/dapr/actor/runtime/_reminder_data.py b/dapr/actor/runtime/_reminder_data.py
index dec698ac..8821c94b 100644
--- a/dapr/actor/runtime/_reminder_data.py
+++ b/dapr/actor/runtime/_reminder_data.py
@@ -36,7 +36,7 @@ def __init__(
         reminder_name: str,
         state: Optional[bytes],
         due_time: timedelta,
-        period: timedelta,
+        period: Optional[timedelta] = None,
         ttl: Optional[timedelta] = None,
     ):
         """Creates new :class:`ActorReminderData` instance.
@@ -77,7 +77,7 @@ def due_time(self) -> timedelta:
         return self._due_time
 
     @property
-    def period(self) -> timedelta:
+    def period(self) -> Optional[timedelta]:
         """Gets period of Actor Reminder."""
         return self._period
 
diff --git a/dapr/actor/runtime/actor.py b/dapr/actor/runtime/actor.py
index 9f8d6ff8..79b1e6ab 100644
--- a/dapr/actor/runtime/actor.py
+++ b/dapr/actor/runtime/actor.py
@@ -112,7 +112,7 @@ async def register_reminder(
         name: str,
         state: bytes,
         due_time: timedelta,
-        period: timedelta,
+        period: Optional[timedelta] = None,
         ttl: Optional[timedelta] = None,
     ) -> None:
         """Registers actor reminder.
diff --git a/dapr/actor/runtime/mock_actor.py b/dapr/actor/runtime/mock_actor.py
index e35baac5..82170672 100644
--- a/dapr/actor/runtime/mock_actor.py
+++ b/dapr/actor/runtime/mock_actor.py
@@ -86,7 +86,7 @@ async def register_reminder(
         name: str,
         state: bytes,
         due_time: timedelta,
-        period: timedelta,
+        period: Optional[timedelta] = None,
         ttl: Optional[timedelta] = None,
     ) -> None:
         """Adds actor reminder to self._state_manager._mock_reminders.
diff --git a/dapr/actor/runtime/state_manager.py b/dapr/actor/runtime/state_manager.py
index dc7ec033..26d39185 100644
--- a/dapr/actor/runtime/state_manager.py
+++ b/dapr/actor/runtime/state_manager.py
@@ -56,7 +56,7 @@ def ttl_in_seconds(self) -> Optional[int]:
         return self._ttl_in_seconds
 
     @ttl_in_seconds.setter
-    def ttl_in_seconds(self, new_ttl_in_seconds: int) -> None:
+    def ttl_in_seconds(self, new_ttl_in_seconds: Optional[int]) -> None:
         self._ttl_in_seconds = new_ttl_in_seconds
 
 
diff --git a/dapr/clients/grpc/_request.py b/dapr/clients/grpc/_request.py
index 57038121..af761329 100644
--- a/dapr/clients/grpc/_request.py
+++ b/dapr/clients/grpc/_request.py
@@ -109,7 +109,7 @@ def __init__(
         super(InvokeMethodRequest, self).__init__(())
 
         self._content_type = content_type
-        self._http_verb = None
+        self._http_verb: Optional[str] = None
         self._http_querystring: Dict[str, str] = {}
 
         self.set_data(data)
@@ -127,7 +127,7 @@ def http_verb(self) -> Optional[str]:
     @http_verb.setter
     def http_verb(self, val: Optional[str]) -> None:
         """Sets HTTP method to Dapr invocation request."""
-        if val not in self.HTTP_METHODS:
+        if val is not None and val not in self.HTTP_METHODS:
             raise ValueError(f'{val} is the invalid HTTP verb.')
         self._http_verb = val