diff --git a/build/Dockerfile-nginx b/build/Dockerfile-nginx
index 1ee79a4..f03f4a5 100644
--- a/build/Dockerfile-nginx
+++ b/build/Dockerfile-nginx
@@ -1,10 +1,10 @@
-FROM composer/composer:1.1 as composer
+FROM composer:1.8 as composer
 
 ARG version=dev-master
 ARG http_version=dev-master
 RUN mkdir /ppm && cd /ppm && composer require php-pm/php-pm:${version} && composer require php-pm/httpkernel-adapter:${http_version}
 
-FROM alpine:3.7
+FROM alpine:3.9
 
 ENV LC_ALL en_US.UTF-8
 ENV LANG en_US.UTF-8
diff --git a/build/Dockerfile-ppm b/build/Dockerfile-ppm
index ec5a1c7..9a05147 100644
--- a/build/Dockerfile-ppm
+++ b/build/Dockerfile-ppm
@@ -1,10 +1,10 @@
-FROM composer/composer:1.1 as composer
+FROM composer:1.8 as composer
 
 ARG version=dev-master
 ARG http_version=dev-master
 RUN mkdir /ppm && cd /ppm && composer require php-pm/php-pm:${version} && composer require php-pm/httpkernel-adapter:${http_version}
 
-FROM alpine:3.7
+FROM alpine:3.9
 
 ENV LC_ALL en_US.UTF-8
 ENV LANG en_US.UTF-8
diff --git a/build/Dockerfile-standalone b/build/Dockerfile-standalone
index d1aa04a..ea64def 100644
--- a/build/Dockerfile-standalone
+++ b/build/Dockerfile-standalone
@@ -1,10 +1,10 @@
-FROM composer/composer:1.1 as composer
+FROM composer:1.8 as composer
 
 ARG version=dev-master
 ARG http_version=dev-master
 RUN mkdir /ppm && cd /ppm && composer require php-pm/php-pm:${version} && composer require php-pm/httpkernel-adapter:${http_version}
 
-FROM alpine:3.7
+FROM alpine:3.9
 
 ENV LC_ALL en_US.UTF-8
 ENV LANG en_US.UTF-8