diff --git a/whois/Dockerfile b/whois/Dockerfile
index 011db2f..21bf05e 100644
--- a/whois/Dockerfile
+++ b/whois/Dockerfile
@@ -1,6 +1,7 @@
-FROM alpine
-MAINTAINER Airton Zanon "airtonzanon@gmail.com"
+FROM alpine:edge
+MAINTAINER Airton Zanon <airtonzanon@gmail.com>
 
-RUN echo "@edge http://dl-4.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories && apk --update --force add whois@edge
+RUN apk --no-cache add \
+	whois
 
-ENTRYPOINT ["whois"]
+ENTRYPOINT [ "whois" ]