diff --git a/docker-test.sh b/docker-test.sh
index 8d2d8505..44821126 100755
--- a/docker-test.sh
+++ b/docker-test.sh
@@ -1,23 +1,4 @@
 #!/bin/bash
 
-usage() {
-    echo "Usage: $0 [nodejs6|nodejs10]"
-    exit 1
-}
-
-echo "$0 $1"
-
-NODEJS_VERSION=${1-nodejs10}
-
-if [ "$NODEJS_VERSION" = "nodejs10" ];
-then
-    DOCKER='nodejs10-xenial-pg101:postgis-2.4.4.5'
-elif [ "$NODEJS_VERSION" = "nodejs6" ];
-then
-    DOCKER='nodejs6-xenial-pg101:postgis-2.4.4.5'
-else
-    usage
-fi
-
-docker run -v `pwd`:/srv carto/${DOCKER} bash run_tests_docker.sh ${NODEJS_VERSION} && \
+docker run -e "NODEJS_VERSION=${1}" -v `pwd`:/srv carto/nodejs-xenial-pg101:latest bash run_tests_docker.sh && \
     docker ps --filter status=dead --filter status=exited -aq | xargs docker rm -v
diff --git a/run_tests_docker.sh b/run_tests_docker.sh
index 1ccde19f..904b80f8 100644
--- a/run_tests_docker.sh
+++ b/run_tests_docker.sh
@@ -1,40 +1,23 @@
 #!/bin/bash
 
-usage() {
-    /etc/init.d/postgresql stop
-    echo "Usage: $0 [nodejs10|nodejs6]"
-    exit 1
-}
+source /src/nodejs-install.sh
 
-echo "$0 $1"
-
-# start PostgreSQL
-/etc/init.d/postgresql start
-
-echo "Node.js version:"
+echo "Node.js version: "
 node -v
 
 # install dependencies
-NODEJS_VERSION=${1-nodejs10}
-
-if [ "$NODEJS_VERSION" = "nodejs10" ];
-then
-    echo "npm version on install:"
-    npm -v
-    npm ci
-    npm ls
-elif [ "$NODEJS_VERSION" = "nodejs6" ];
+if [ "$NODEJS_VERSION" = "6" ];
 then
     npm install -g yarn@0.27.5
     echo "yarn version on install:"
     yarn --version
     yarn
 else
-    usage
+    echo "npm version:"
+    npm -v
+    npm ci
+    npm ls
 fi
 
 # run tests
-echo "npm version on tests:"
-npm -v
-
 npm test