diff --git a/regression/externalTools/MARS/requirements.txt b/regression/externalTools/MARS/requirements.txt
index 3f6c83c..2ca1848 100644
--- a/regression/externalTools/MARS/requirements.txt
+++ b/regression/externalTools/MARS/requirements.txt
@@ -111,7 +111,7 @@ plac==0.9.6
 playsound==1.2.1
 ply==3.8
 preshed==0.46.4
-protobuf==3.0.0b2
+protobuf==3.15.0
 psutil==4.1.0
 psycopg2==2.6.1
 ptyprocess==0.5