diff --git a/backend-python/requirements_versions.txt b/backend-python/requirements_versions.txt
index df9e09e..79a0167 100644
Binary files a/backend-python/requirements_versions.txt and b/backend-python/requirements_versions.txt differ
diff --git a/backend-python/routes/state_cache.py b/backend-python/routes/state_cache.py
index b8a836f..b3b8922 100644
--- a/backend-python/routes/state_cache.py
+++ b/backend-python/routes/state_cache.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict
+from typing import Any, Dict, List
 from utils.log import quick_log
 from fastapi import APIRouter, HTTPException, Request, Response, status
 from pydantic import BaseModel
@@ -31,7 +31,7 @@ def init():
 
 class AddStateBody(BaseModel):
     prompt: str
-    tokens: list[str]
+    tokens: List[str]
     state: Any
     logits: Any
 
diff --git a/backend-python/rwkv_pip/rwkv_tokenizer.py b/backend-python/rwkv_pip/rwkv_tokenizer.py
index 2d275f5..e969eac 100644
--- a/backend-python/rwkv_pip/rwkv_tokenizer.py
+++ b/backend-python/rwkv_pip/rwkv_tokenizer.py
@@ -72,9 +72,9 @@ class TRIE_TOKENIZER:
         for t, i in self.token2idx.items():
             _ = self.root.add(t, val=(t, i))
 
-    def encodeBytes(self, src: bytes) -> list[int]:
+    def encodeBytes(self, src: bytes):
         idx: int = 0
-        tokens: list[int] = []
+        tokens = []
         while idx < len(src):
             _idx: int = idx
             idx, _, values = self.root.find_longest(src, idx)