diff --git a/src/crewai/flow/flow.py b/src/crewai/flow/flow.py
index f60e5c1e3..41f60e2f5 100644
--- a/src/crewai/flow/flow.py
+++ b/src/crewai/flow/flow.py
@@ -148,15 +148,15 @@ class Flow(Generic[T], metaclass=FlowMeta):
     _router_paths: Dict[str, List[str]] = {}
     initial_state: Union[Type[T], T, None] = None
 
-    def __class_getitem__(cls, item):
+    def __class_getitem__(cls, item: Type[T]) -> Type["Flow"]:
         class _FlowGeneric(cls):
-            _initial_state_T = item
+            _initial_state_T: Type[T] = item
 
         return _FlowGeneric
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._methods: Dict[str, Callable] = {}
-        self._state = self._create_initial_state()
+        self._state: T = self._create_initial_state()
         self._completed_methods: Set[str] = set()
         self._pending_and_listeners: Dict[str, Set[str]] = {}
         self._method_outputs: List[Any] = []  # List to store all method outputs
@@ -205,11 +205,11 @@ class Flow(Generic[T], metaclass=FlowMeta):
         else:
             return None  # Or raise an exception if no methods were executed
 
-    async def _execute_start_method(self, start_method: str):
+    async def _execute_start_method(self, start_method: str) -> None:
         result = await self._execute_method(self._methods[start_method])
         await self._execute_listeners(start_method, result)
 
-    async def _execute_method(self, method: Callable, *args, **kwargs):
+    async def _execute_method(self, method: Callable, *args: Any, **kwargs: Any) -> Any:
         result = (
             await method(*args, **kwargs)
             if asyncio.iscoroutinefunction(method)
@@ -218,7 +218,7 @@ class Flow(Generic[T], metaclass=FlowMeta):
         self._method_outputs.append(result)  # Store the output
         return result
 
-    async def _execute_listeners(self, trigger_method: str, result: Any):
+    async def _execute_listeners(self, trigger_method: str, result: Any) -> None:
         listener_tasks = []
 
         if trigger_method in self._routers:
@@ -246,7 +246,7 @@ class Flow(Generic[T], metaclass=FlowMeta):
         # Run all listener tasks concurrently and wait for them to complete
         await asyncio.gather(*listener_tasks)
 
-    async def _execute_single_listener(self, listener: str, result: Any):
+    async def _execute_single_listener(self, listener: str, result: Any) -> None:
         try:
             method = self._methods[listener]
             sig = inspect.signature(method)
@@ -270,5 +270,5 @@ class Flow(Generic[T], metaclass=FlowMeta):
 
             traceback.print_exc()
 
-    def plot(self, filename: str = "crewai_flow_graph"):
+    def plot(self, filename: str = "crewai_flow_graph") -> None:
         plot_flow(self, filename)
diff --git a/src/crewai/flow/html_template_handler.py b/src/crewai/flow/html_template_handler.py
index 8a88da42a..31b1b03f4 100644
--- a/src/crewai/flow/html_template_handler.py
+++ b/src/crewai/flow/html_template_handler.py
@@ -1,5 +1,4 @@
 import base64
-import os
 import re