diff --git a/demo/requirements.txt b/demo/requirements.txt
index 5d48c52..d6d1c4f 100644
--- a/demo/requirements.txt
+++ b/demo/requirements.txt
@@ -6,7 +6,7 @@ MarkupSafe==1.1.1
 numpy==1.16.2
 Pillow==5.4.1
 pkg-resources==0.0.0
-protobuf==3.6.1
+protobuf==3.18.3
 scipy==1.2.1
 six==1.12.0
 tensorboardX==1.6
diff --git a/requirements.txt b/requirements.txt
index 5fa1b61..879f0c7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 numpy==1.16.2
 Pillow==5.4.1
 pkg-resources==0.0.0
-protobuf==3.6.1
+protobuf==3.18.3
 scipy==1.2.1
 six==1.12.0
 tensorboardX==1.6