diff --git a/Dockerfile b/Dockerfile
index fd7567b..1e4e221 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,3 +5,4 @@ COPY listmonk .
 COPY config.toml.sample config.toml
 COPY config-demo.toml .
 CMD ["./listmonk"]
+EXPOSE 9000