diff --git a/requirements.txt b/requirements.txt
index 1e53145..b46c212 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ padme==1.1.1
 pexpect==4.0.1
 Pillow==3.1.2
 plainbox==0.25
-protobuf==3.5.0
+protobuf==3.18.3
 ptyprocess==0.5
 py==1.4.34
 pyasn1==0.1.9