diff --git a/lightrag/llm.py b/lightrag/llm.py
index 19d22bc8..42b89e94 100644
--- a/lightrag/llm.py
+++ b/lightrag/llm.py
@@ -92,12 +92,15 @@ async def azure_openai_complete_if_cache(
     history_messages=[],
     base_url=None,
     api_key=None,
+    api_version=None,
     **kwargs,
 ):
     if api_key:
         os.environ["AZURE_OPENAI_API_KEY"] = api_key
     if base_url:
         os.environ["AZURE_OPENAI_ENDPOINT"] = base_url
+    if api_version:
+        os.environ["AZURE_OPENAI_API_VERSION"] = api_version
 
     openai_async_client = AsyncAzureOpenAI(
         azure_endpoint=os.getenv("AZURE_OPENAI_ENDPOINT"),