diff --git a/requirements.txt b/requirements.txt
index 44cf176..26a9538 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ MarkupSafe==1.0
 numpy==1.15.3
 opencv-python==3.4.3.18
 Pillow==5.3.0
-protobuf==3.6.1
+protobuf==3.15.0
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 pybase64==0.4.0