diff --git a/build/Dockerfile b/build/Dockerfile
index e90ff25..e205a63 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -14,8 +14,8 @@ RUN make build-nogui vault-editor
 FROM debian:sid-slim
 LABEL maintainer="Simon Felding <sife@adm.ku.dk>"
 
-EXPOSE 25/tcp
-EXPOSE 143/tcp
+EXPOSE 12025/tcp
+EXPOSE 12143/tcp
 
 # Install dependencies and protonmail bridge
 RUN apt-get update \