diff --git a/requirements.txt b/requirements.txt
index 01af9c9bd..0cfb3b68b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ keras_radam == 0.15.0
 numpy == 1.19.4
 
 # tbcnn-attention/fast_pb2.py: 7,8,9,10,11
-protobuf == 3.14.0
+protobuf == 3.18.3
 
 # tbcnn-attention/util/data/data_processor/pycparser_data_processor.py: 15
 pycparser == 2.20