diff --git a/Dockerfile b/Dockerfile
index 0da8379..440874e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ RUN unzip rclone-current-linux-amd64.zip && mv rclone-*-linux-amd64/rclone /bin/
 
 FROM docker.io/restic/restic:0.18.0
 
-RUN apk add --update --no-cache curl mailx
+RUN apk add --update --no-cache curl mailx shadow
 
 COPY --from=rclone /bin/rclone /bin/rclone
 
diff --git a/Dockerfile.arm64 b/Dockerfile.arm64
index 996878b..21afc0f 100644
--- a/Dockerfile.arm64
+++ b/Dockerfile.arm64
@@ -6,7 +6,7 @@ RUN unzip rclone-current-linux-arm64.zip && mv rclone-*-linux-arm64/rclone /bin/
 
 FROM docker.io/restic/restic:0.18.0
 
-RUN apk add --update --no-cache curl mailx
+RUN apk add --update --no-cache curl mailx shadow
 
 COPY --from=rclone /bin/rclone /bin/rclone