diff --git a/compose/production/portal/Dockerfile b/compose/production/portal/Dockerfile
index 99a9b76..5f5edeb 100644
--- a/compose/production/portal/Dockerfile
+++ b/compose/production/portal/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:alpine
+FROM nginx:1.21.1-alpine
 
 ADD run.sh /run.sh
 ADD default.conf /etc/nginx/conf.d/default.conf