diff --git a/Dockerfile b/Dockerfile
index d8eed1a..eaf457f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,13 +1,16 @@
 FROM alpine as build
-ARG ALPINE_VERSION
-ENV ALPINE_MIRROR https://uk.alpinelinux.org/alpine/v3.8
+
+ARG VERSION
+ENV ALPINE_SERIES 3.9
+ENV ALPINE_MIRROR https://uk.alpinelinux.org/alpine/v${ALPINE_SERIES}
 ENV ALPINE_ARCH x86_64
+
 WORKDIR /root
-RUN apk add --no-cache curl &&\
-  curl -LO ${ALPINE_MIRROR}/releases/${ALPINE_ARCH}/alpine-minirootfs-${ALPINE_VERSION}-${ALPINE_ARCH}.tar.gz &&\
+RUN set -x; apk add --no-cache curl &&\
+  curl -LO ${ALPINE_MIRROR}/releases/${ALPINE_ARCH}/alpine-minirootfs-${VERSION}-${ALPINE_ARCH}.tar.gz &&\
   mkdir /dest &&\
-  tar -C /dest -xvzf alpine-minirootfs-${ALPINE_VERSION}-${ALPINE_ARCH}.tar.gz &&\
-  sed -i "s#http://dl-cdn.alpinelinux.org/alpine/v3.8#${ALPINE_MIRROR}#g" /dest/etc/apk/repositories
+  tar -C /dest -xvzf alpine-minirootfs-${VERSION}-${ALPINE_ARCH}.tar.gz &&\
+  sed -i "s#http://dl-cdn.alpinelinux.org/alpine/v${ALPINE_SERIES}#${ALPINE_MIRROR}#g" /dest/etc/apk/repositories
 
 FROM scratch
 COPY --from=build /dest /
diff --git a/Jenkinsfile b/Jenkinsfile
index 34118b8..178b946 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -6,7 +6,7 @@ pipeline {
         withDockerRegistry([ credentialsId: "6ff44976-23cd-4cc2-902c-de8c340e65e5", url: "https://reg.zknt.org" ]) {
           echo 'Starting to build docker image'
           script {
-            def customImage = docker.build("reg.zknt.org/zknt/alpine", "--build-arg ALPINE_VERSION=$env.BRANCH_NAME .")
+            def customImage = docker.build("reg.zknt.org/zknt/alpine", "--build-arg VERSION=$env.BRANCH_NAME .")
             customImage.push(env.BRANCH_NAME)
             customImage.push(env.BRANCH_NAME.split(/\./)[0,1].join('.'))
             customImage.push(env.BRANCH_NAME.split(/\./)[0])
diff --git a/README.md b/README.md
index 2372177..bacdc34 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
 stock alpine
 ============
 
-Last update: 2018-12-23
+Last update: 2019-03-05