diff --git a/requirements.txt b/requirements.txt
index 6946d3b..2108102 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ numexpr==2.6.1
 numpy==1.12.0
 pandas==0.19.1
 Pillow==3.4.2
-protobuf==3.0.0
+protobuf==3.18.3
 psutil==5.0.0
 scikit-learn==0.18.1
 scipy==0.18.1