diff --git a/example/timestamp-as-a-service/services/api/requirements.txt b/example/timestamp-as-a-service/services/api/requirements.txt
index dcc7bdf..38345ec 100644
--- a/example/timestamp-as-a-service/services/api/requirements.txt
+++ b/example/timestamp-as-a-service/services/api/requirements.txt
@@ -8,5 +8,5 @@ Flask==1.0.2
 itsdangerous==1.1.0
 Jinja2==2.11.3
 MarkupSafe==1.1.1
-redis==3.2.1
+redis==4.4.4
 Werkzeug==0.15.3