diff --git a/src/mcp/server/stdio.py b/src/mcp/server/stdio.py
index d74d6bc..ddebf2a 100644
--- a/src/mcp/server/stdio.py
+++ b/src/mcp/server/stdio.py
@@ -27,6 +27,10 @@ async def run_server():
 
 import mcp.types as types
 
+import io
+sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8')
+sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
+
 
 @asynccontextmanager
 async def stdio_server(