diff --git a/tf-agents-example/requirements.txt b/tf-agents-example/requirements.txt
index 9f7064e..f93c935 100644
--- a/tf-agents-example/requirements.txt
+++ b/tf-agents-example/requirements.txt
@@ -12,7 +12,7 @@ kiwisolver==1.0.1
 Markdown==3.0.1
 matplotlib==3.0.3
 numpy==1.16.2
-protobuf==3.15.0
+protobuf==3.18.3
 pyparsing==2.3.1
 python-dateutil==2.8.0
 six==1.12.0