diff --git a/requirements.txt b/requirements.txt
index 437f9a8..9b00fe8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ leveldb==0.194
 matplotlib==2.2.4
 numpy==1.16.3
 Pillow==6.0.0
-protobuf==2.6.1
+protobuf==3.18.3
 python-gflags==3.1.2
 scikit-image==0.14.2
 scikit-learn==0.20.4