diff --git a/requirements.txt b/requirements.txt
index e023dd6..387245e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ Keras==2.1.5
 keras_metrics==1.0.0
 Markdown==2.6.11
 numpy==1.14.2
-protobuf==3.5.2.post1
+protobuf==3.18.3
 pyyaml>=4.2b1
 scapy>=2.4.1
 scipy==1.0.0