diff --git a/tutorials/ar-subs/requirements.txt b/tutorials/ar-subs/requirements.txt
index 67a22884f5..b376436ecc 100644
--- a/tutorials/ar-subs/requirements.txt
+++ b/tutorials/ar-subs/requirements.txt
@@ -11,7 +11,7 @@ idna==2.10
 numpy==1.19.0
 pkg-resources==0.0.0
 proto-plus==1.0.0
-protobuf==3.12.2
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 PyAudio==0.2.11