diff --git a/Dockerfile b/Dockerfile
index fbb481c..bc07670 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,4 +7,11 @@ RUN apk add --no-cache \
     nodejs \
     lftp
 
-USER 1000
+ARG USERNAME=runner
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+RUN addgroup --gid $USER_GID $USERNAME \
+    && adduser -u $USER_UID -G $USERNAME -D $USERNAME
+
+USER $USERNAME