diff --git a/requirements.txt b/requirements.txt
index 9c1554a..28721ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
-pymilvus
 towhee
-numpy
\ No newline at end of file
+numpy
+protobuf<4.0dev,>=3.12.0
+pymilvus