diff --git a/requirements.txt b/requirements.txt
index b63ec61..f57b188 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ Markdown==3.1.1
 numpy==1.18.0
 opt-einsum==3.1.0
 Pillow==7.0.0
-protobuf==3.11.2
+protobuf==3.18.3
 six==1.13.0
 tensorboard==1.15.0
 tensorflow==1.15.0