diff --git a/.travis.yml b/.travis.yml
index 5905eee0..0a26c190 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,7 +15,6 @@ addons:
 
 env:
   - MAILU_VERSION=${TRAVIS_BRANCH////-}
-  - ALPINE_VERSION=3.10
 
 language: python
 python:
@@ -27,7 +26,7 @@ install:
 
 before_script:
   - docker-compose -v
-  - docker-compose -f tests/build.yml build --build-arg ALPINE_VERSION=${ALPINE_VERSION}
+  - docker-compose -f tests/build.yml build
   - sudo -- sh -c 'mkdir -p /mailu && cp -r tests/certs /mailu && chmod 600 /mailu/certs/*'
 
 
diff --git a/core/admin/Dockerfile b/core/admin/Dockerfile
index 7252aeb0..22bd4466 100644
--- a/core/admin/Dockerfile
+++ b/core/admin/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \
diff --git a/core/dovecot/Dockerfile b/core/dovecot/Dockerfile
index f36d1951..a4a4c3a3 100644
--- a/core/dovecot/Dockerfile
+++ b/core/dovecot/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \
diff --git a/core/nginx/Dockerfile b/core/nginx/Dockerfile
index 3c6115ce..1630d58a 100644
--- a/core/nginx/Dockerfile
+++ b/core/nginx/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \
diff --git a/core/none/Dockerfile b/core/none/Dockerfile
index b383115a..96bf8411 100644
--- a/core/none/Dockerfile
+++ b/core/none/Dockerfile
@@ -1,6 +1,5 @@
 # This is an idle image to dynamically replace any component if disabled.
 
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 
 CMD sleep 1000000d
diff --git a/core/postfix/Dockerfile b/core/postfix/Dockerfile
index dfedb818..c298efa2 100644
--- a/core/postfix/Dockerfile
+++ b/core/postfix/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \
diff --git a/docs/contributors/environment.rst b/docs/contributors/environment.rst
index b326c79c..161619f6 100644
--- a/docs/contributors/environment.rst
+++ b/docs/contributors/environment.rst
@@ -112,7 +112,7 @@ After cloning the git repository to your workstation, you can build the images:
 .. code-block:: bash
 
   cd Mailu
-  docker-compose -f tests/build.yml build --build-arg ALPINE_VERSION=3.10
+  docker-compose -f tests/build.yml build
 
 The ``build.yml`` file has two variables:
 
@@ -125,7 +125,7 @@ To re-build only specific containers at a later time.
 
 .. code-block:: bash
 
-  docker-compose -f tests/build.yml --build-arg ALPINE_VERSION=3.10 build admin webdav
+  docker-compose -f tests/build.yml build admin webdav
 
 If you have to push the images to Docker Hub for testing in Docker Swarm or a remote
 host, you have to define ``DOCKER_ORG`` (usually your Docker user-name) and login to
@@ -138,7 +138,7 @@ the hub.
   Password: Bar
   export DOCKER_ORG="Foo"
   export VERSION="feat-extra-app"
-  docker-compose -f tests/build.yml build --build-arg ALPINE_VERSION=3.10
+  docker-compose -f tests/build.yml build
   docker-compose -f tests/build.yml push
 
 Running containers
diff --git a/optional/clamav/Dockerfile b/optional/clamav/Dockerfile
index 6375e317..02d0279a 100644
--- a/optional/clamav/Dockerfile
+++ b/optional/clamav/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash \
diff --git a/optional/postgresql/Dockerfile b/optional/postgresql/Dockerfile
index 3edf45d0..4a2ccaf4 100644
--- a/optional/postgresql/Dockerfile
+++ b/optional/postgresql/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash \
diff --git a/optional/radicale/Dockerfile b/optional/radicale/Dockerfile
index 98b90746..66c1d5ca 100644
--- a/optional/radicale/Dockerfile
+++ b/optional/radicale/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 
 RUN echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
  && apk add --no-cache radicale@testing curl bash
diff --git a/services/fetchmail/Dockerfile b/services/fetchmail/Dockerfile
index 62a826de..d68bcb14 100644
--- a/services/fetchmail/Dockerfile
+++ b/services/fetchmail/Dockerfile
@@ -1,6 +1,5 @@
 # First stage: Build
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION as builder
+FROM alpine:3.10 as builder
 
 # build dependencies
 RUN apk add --no-cache curl tar xz autoconf git gettext build-base openssl openssl-dev
@@ -11,7 +10,7 @@ RUN cd fetchmail-7.0.0-alpha6 && \
     ./configure --with-ssl --prefix /usr/local --disable-nls && \
     make
 
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 
 
 # python3 shared with most images
diff --git a/services/rspamd/Dockerfile b/services/rspamd/Dockerfile
index d1a85a28..6587eb51 100644
--- a/services/rspamd/Dockerfile
+++ b/services/rspamd/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \
diff --git a/services/unbound/Dockerfile b/services/unbound/Dockerfile
index 4e92e7e1..b8e31049 100644
--- a/services/unbound/Dockerfile
+++ b/services/unbound/Dockerfile
@@ -1,5 +1,4 @@
-ARG ALPINE_VERSION
-FROM alpine:$ALPINE_VERSION
+FROM alpine:3.10
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash \