diff --git a/architectures/chainer/requirements.txt b/architectures/chainer/requirements.txt
index 7ee15c2..a8965c7 100644
--- a/architectures/chainer/requirements.txt
+++ b/architectures/chainer/requirements.txt
@@ -10,7 +10,7 @@ nose==1.3.7
 numpy==1.13.1
 olefile==0.44
 Pillow==4.2.1
-protobuf==3.3.0
+protobuf==3.15.0
 pyglet==1.2.4
 PyOpenGL==3.1.0
 requests==2.18.1