diff --git a/core/drupalci.yml b/core/drupalci.yml
index 47947edd03..f8c9325d91 100644
--- a/core/drupalci.yml
+++ b/core/drupalci.yml
@@ -18,7 +18,7 @@ build:
       # Update PHPUnit & friends.
       container_command:
         commands:
-          - "sudo -u www-data /usr/local/bin/composer self-update --snapshot"
+          - "/usr/local/bin/composer self-update --snapshot"
           - "sudo -u www-data /usr/local/bin/composer require composer/composer:dev-master mikey179/vfsstream:dev-master --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.