diff --git a/requirements.txt b/requirements.txt
index 0acab3f..852d210 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ opencv-python==4.1.2.30
 opt-einsum==3.1.0
 pep8==1.7.1
 Pillow==6.2.1
-protobuf==3.10.0
+protobuf==3.15.0
 pyasn1==0.4.7
 pyasn1-modules==0.2.7
 pycodestyle==2.5.0