diff --git a/requirements.txt b/requirements.txt
index 05800d2..493a1c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ idna==2.8
 msgpack==0.6.2
 Pillow==8.3.2
 # pkg-resources==0.0.0
-protobuf==3.15.0
+protobuf==3.18.3
 pyasn1==0.4.7
 pyasn1-modules==0.2.7
 pytz==2019.3