diff --git a/src/utils/messageUtils.ts b/src/utils/messageUtils.ts
index 21f0ec4..b971e5b 100644
--- a/src/utils/messageUtils.ts
+++ b/src/utils/messageUtils.ts
@@ -1,6 +1,7 @@
 import { MessageInterface, ModelOptions } from '@type/chat';
 
-import { encoding_for_model } from '@dqbd/tiktoken';
+import { Tiktoken } from '@dqbd/tiktoken/lite';
+const cl100k_base = await import('@dqbd/tiktoken/encoders/cl100k_base.json');
 
 // https://github.com/dqbd/tiktoken/issues/23#issuecomment-1483317174
 export const getChatGPTEncoding = (
@@ -9,11 +10,16 @@ export const getChatGPTEncoding = (
 ) => {
   const isGpt3 = model === 'gpt-3.5-turbo';
 
-  const encoder = encoding_for_model(model, {
-    '<|im_start|>': 100264,
-    '<|im_end|>': 100265,
-    '<|im_sep|>': 100266,
-  });
+  const encoder = new Tiktoken(
+    cl100k_base.bpe_ranks,
+    {
+      ...cl100k_base.special_tokens,
+      '<|im_start|>': 100264,
+      '<|im_end|>': 100265,
+      '<|im_sep|>': 100266,
+    },
+    cl100k_base.pat_str
+  );
 
   const msgSep = isGpt3 ? '\n' : '';
   const roleSep = isGpt3 ? '\n' : '<|im_sep|>';