diff --git a/ChineseSegmentation/requirements.txt b/ChineseSegmentation/requirements.txt
index a3c8279..ab8dc12 100644
--- a/ChineseSegmentation/requirements.txt
+++ b/ChineseSegmentation/requirements.txt
@@ -52,7 +52,7 @@ pathtools==0.1.2
 pexpect==4.2.1
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.18.3
 ptyprocess==0.5.2
 pyasn1==0.2.3
 pycparser==2.18