diff --git a/requirements.txt b/requirements.txt
index faf0bf9..0bba862 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ more-itertools==6.0.0
 numpy==1.16.1
 pandas==0.24.1
 Pillow==5.4.1
-protobuf==3.6.1
+protobuf==3.15.0
 PyAudio==0.2.11
 pycodestyle==2.5.0
 pycparser==2.19