diff --git a/core/drupalci.yml b/core/drupalci.yml
index 5ac6890e6c..37c0f76120 100644
--- a/core/drupalci.yml
+++ b/core/drupalci.yml
@@ -19,7 +19,8 @@ build:
       container_command:
         commands:
           - "/usr/local/bin/composer self-update --snapshot"
-          - "sudo -u www-data /usr/local/bin/composer require composer/composer:dev-master mikey179/vfsstream:v1.x-dev symfony/validator:3.4.x-dev --no-progress"
+          - "sudo -u www-data /usr/local/bin/composer require composer/composer:dev-master symfony/validator:3.4.x-dev --no-progress"
+          - "sudo -u www-data /usr/local/bin/composer update mikey179/vfsstream --with-dependencies --no-progress"
       # run_tests task is executed several times in order of performance speeds.
       # halt-on-fail can be set on the run_tests tasks in order to fail fast.
       # suppress-deprecations is false in order to be alerted to usages of