diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 76a6e0b..a0f20c4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,7 @@ services:
   - docker:dind
 
 variables:
+  DOCKER_YII2_PHP_IMAGE: yiisoftware/yii2-php:7.1-apache
   DOCKER_MYSQL_IMAGE: percona:5.7
   DOCKER_POSTGRES_IMAGE: postgres:9.3
 
diff --git a/Dockerfile b/Dockerfile
index 88761db..77ffdfd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
-FROM yiisoftware/yii2-php:7.1-apache
+ARG DOCKER_YII2_PHP_IMAGE
+FROM ${DOCKER_YII2_PHP_IMAGE}
 
 # Project source-code
 WORKDIR /project
diff --git a/tests/.env-dist b/tests/.env-dist
index 5ab09d6..ea4dfaa 100644
--- a/tests/.env-dist
+++ b/tests/.env-dist
@@ -4,5 +4,6 @@
 COMPOSE_FILE=docker-compose.yml:docker-compose.mysql.yml:docker-compose.pgsql.yml:docker-compose.caching.yml
 
 # Image versions
+DOCKER_YII2_PHP_IMAGE=yiisoftware/yii2-php:7.2-apache
 DOCKER_MYSQL_IMAGE=percona:5.7
 DOCKER_POSTGRES_IMAGE=postgres
diff --git a/tests/docker-compose.yml b/tests/docker-compose.yml
index 3a11c66..1e22318 100644
--- a/tests/docker-compose.yml
+++ b/tests/docker-compose.yml
@@ -2,7 +2,10 @@ version: '2'
 services:
 
   php:
-    build: ..
+    build:
+      context: ..
+      args:
+        DOCKER_YII2_PHP_IMAGE: ${DOCKER_YII2_PHP_IMAGE}
     working_dir: /project
     volumes:
       - ../tests/data/config-docker.php:/project/tests/data/config.php
@@ -14,11 +17,3 @@ services:
     #  - /project/tests/runtime
     environment:
       - TEST_RUNTIME_PATH=/tmp/runtime
-
-networks:
-  default:
-    ipam:
-      driver: default
-      config:
-        # prevent overlapping/duplicated networks, since docker assigns /16 subnets by default ranging from 10.x over 172.x to 192.168.x
-        - subnet: 10.100.1${TUPLE_C}.1/24
\ No newline at end of file
diff --git a/tests/test-local.sh b/tests/test-local.sh
index e4465c2..9b286fb 100644
--- a/tests/test-local.sh
+++ b/tests/test-local.sh
@@ -9,18 +9,13 @@ export CI_PIPELINE_ID=${1}
 case $1 in
 'default')
     export ISOLATION=buildpipeline${CI_PIPELINE_ID}
-    export COMPOSE_PROJECT_NAME=${ISOLATION}
-    export TUPLE_C=$(expr ${CI_BUILD_ID} % 255)
-    echo ${TUPLE_C}
+    export COMPOSE_PROJECT_NAME=${ISOLATION}default
     docker-compose up -d
     docker-compose run --rm php vendor/bin/phpunit -v --exclude caching,db
     docker-compose down -v
   ;;
 'caching')
     export ISOLATION=buildpipeline${CI_PIPELINE_ID}
-    export COMPOSE_PROJECT_NAME=${ISOLATION}
-    export TUPLE_C=$(expr ${CI_BUILD_ID} % 255)
-    echo ${TUPLE_C}
     export COMPOSE_PROJECT_NAME=${ISOLATION}caching
     docker-compose up -d
     docker-compose run --rm php bash -c "while ! curl mysql:3306; do ((c++)) && ((c==30)) && break; sleep 2; done"
@@ -29,9 +24,7 @@ case $1 in
   ;;
 'mssql')
     export ISOLATION=buildpipeline${CI_PIPELINE_ID}
-    export COMPOSE_PROJECT_NAME=${ISOLATION}
-    export TUPLE_C=$(expr ${CI_BUILD_ID} % 255)
-    echo ${TUPLE_C}
+    export COMPOSE_PROJECT_NAME=${ISOLATION}mssql
     cd mssql
     docker-compose up --build -d
     docker-compose run --rm php bash -c 'while [ true ]; do curl mssql:1433; if [ $? == 52 ]; then break; fi; ((c++)) && ((c==15)) && break; sleep 5; done'
@@ -48,9 +41,6 @@ case $1 in
   ;;
 'pgsql')
     export ISOLATION=buildpipeline${CI_PIPELINE_ID}
-    export COMPOSE_PROJECT_NAME=${ISOLATION}
-    export TUPLE_C=$(expr ${CI_BUILD_ID} % 255)
-    echo ${TUPLE_C}
     export COMPOSE_PROJECT_NAME=${ISOLATION}pgsql
     docker-compose up -d
     docker-compose run --rm php bash -c 'while [ true ]; do curl postgres:5432; if [ $? == 52 ]; then break; fi; ((c++)) && ((c==25)) && break; sleep 2; done'