diff --git a/peer-connection/requirements.txt b/peer-connection/requirements.txt
index 5881b5c..39ab3a2 100644
--- a/peer-connection/requirements.txt
+++ b/peer-connection/requirements.txt
@@ -1,4 +1,4 @@
 ecdsa==0.13.2
 pkg-resources==0.0.0
-protobuf==3.9.1
+protobuf==3.15.0
 six==1.12.0