diff --git a/requirements.txt b/requirements.txt
index a3975a2..62b18b3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ Markdown==3.1.1
 matplotlib==3.1.1
 more-itertools==7.2.0
 numpy==1.17.2
-protobuf==3.9.1
+protobuf==3.18.3
 pygdbmi==0.9.0.2
 pyparsing==2.4.2
 python-dateutil==2.8.0