diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d3e3a7d..fbdaba3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -11,18 +11,20 @@ services:
 
 test:7:
     before_script:
-      - bash build/docker_install.sh > /dev/null
+      - sh build/docker_install.sh > /dev/null
       - curl -sS https://getcomposer.org/installer | php
-      - php composer.phar install --no-dev
-    image: php:7
+      - apk add --no-cache php7-apcu php7-memcached php7-phpdbg
+      - php composer.phar install --ignore-platform-reqs
+    image: php:7-alpine
     script:
-      - phpunit -c build
+      - phpdbg -qrr -- ./vendor/bin/phpunit -c build
       
 test:7.1:
     before_script:
-      - bash build/docker_install.sh > /dev/null
+      - sh build/docker_install.sh > /dev/null
       - curl -sS https://getcomposer.org/installer | php
-      - php composer.phar install --no-dev
-    image: php:7.1
+      - apk add --no-cache php7.1-apcu php7.1-memcached php7.1-phpdbg
+      - php composer.phar install --ignore-platform-reqs
+    image: php:7.1-alpine
     script:
-      - phpunit -c build
+      - phpdbg -qrr -- ./vendor/bin/phpunit -c build
diff --git a/build/docker_install.sh b/build/docker_install.sh
index 8690f16..ee4cd02 100644
--- a/build/docker_install.sh
+++ b/build/docker_install.sh
@@ -3,36 +3,13 @@
 # We need to install dependencies only for Docker
 [[ ! -e /.dockerenv ]] && [[ ! -e /.dockerinit ]] && exit 0
 
-# Where am I?
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-
 set -xe
 
 # Install git (the php image doesn't have it) which is required by composer
-apt-get update -yqq
-apt-get install \
-	git \
-	unzip \
-	libfreetype6 \
-	libjpeg62-turbo \
-	libmcrypt4 \
-	libpng12-0 \
-	libfreetype6-dev \
-	libjpeg-dev \
-	libmcrypt-dev \
-	libpng12-dev \
-	libxslt1-dev \
-	libxslt1.1 \
-	zlib1g-dev \
-	-yqq
-
-# Install phpunit, the tool that we will use for testing
-curl -Lo /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
-chmod +x /usr/local/bin/phpunit
-
-# Install extensions
-docker-php-ext-install apcu
-docker-php-ext-install memcache
-docker-php-ext-install memcached
-docker-php-ext-install xsl
-docker-php-ext-install zip
\ No newline at end of file
+echo -e 'http://dl-cdn.alpinelinux.org/alpine/edge/main\nhttp://dl-cdn.alpinelinux.org/alpine/edge/community\nhttp://dl-cdn.alpinelinux.org/alpine/edge/testing' > /etc/apk/repositories
+apk upgrade --update && apk add --no-cache \
+	g++ \
+	make \
+	automake \
+	curl \
+	git
\ No newline at end of file