diff --git a/requirements.txt b/requirements.txt
index 62dfc13..eb4bc5c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ numpy==1.12.1
 olefile==0.44
 pathtools==0.1.2
 Pillow==4.0.0
-protobuf==3.5.0.post1
+protobuf==3.18.3
 PyYAML==3.12
 requests==2.18.3
 scipy==1.0.0