diff --git a/Dockerfile b/Dockerfile
index 75f70f2..f792d32 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.9 as alpine
+FROM alpine:3.11 as alpine
 
 RUN apk add --no-cache \
     ca-certificates \
@@ -15,4 +15,4 @@ COPY --from=alpine \
     /usr/share/zoneinfo
 
 COPY watchtower /
-ENTRYPOINT ["/watchtower"]
\ No newline at end of file
+ENTRYPOINT ["/watchtower"]