diff --git a/requirements.txt b/requirements.txt
index 39562f9..6e3751d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ numpy==1.18.4
 opt-einsum==3.2.1
 pandas==0.24.2
 Pillow==7.1.2
-protobuf==3.12.2
+protobuf==3.15.0
 pygraphviz==1.5
 PyGSP==0.5.1
 pyparsing==2.4.7