diff --git a/requirements.txt b/requirements.txt
index 914494e..6775f5b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ olefile==0.44
 packaging==16.8
 Pillow==4.0.0
 plyvel==0.9
-protobuf==3.2.0
+protobuf==3.15.0
 pyasn1==0.2.3
 pycparser==2.18
 pycrypto==2.6.1