diff --git a/Dockerfile b/Dockerfile
index 71527bb..bca74b5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,7 @@ ARG REMOTE_PORT
 ARG LOCAL_PORT
 
 RUN \
+  apk --no-cache upgrade && \
   apk --no-cache add openssh-client
 
 COPY entrypoint.sh /