diff --git a/core/composer.json b/core/composer.json
index e5b3481132..7d7408289c 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -31,7 +31,7 @@
         "symfony/process": "~3.4.0",
         "symfony/polyfill-iconv": "^1.0",
         "symfony/yaml": "~3.4.5",
-        "typo3/phar-stream-wrapper": "^3.1.3",
+        "typo3/phar-stream-wrapper": "^3.1.2",
         "twig/twig": "^1.38.2",
         "doctrine/common": "^2.7",
         "doctrine/annotations": "^1.4",
diff --git a/core/drupalci.yml b/core/drupalci.yml
index ee8e7ccce8..3a399d4ba3 100644
--- a/core/drupalci.yml
+++ b/core/drupalci.yml
@@ -18,8 +18,8 @@ build:
       # Update PHPUnit & friends.
       container_command:
         commands:
-          - "sudo -u www-data /usr/local/bin/composer require composer/composer:dev-master mikey179/vfsstream:2.0.x-dev pear/archive_tar:dev-master --no-progress"
-          - "sudo -u www-data /usr/local/bin/composer update typo3/phar-stream-wrapper --with-dependencies --no-progress"
+          - "sudo -u www-data /usr/local/bin/composer require composer/composer:dev-master mikey179/vfsstream:2.0.x-dev --no-progress"
+          - "sudo -u www-data /usr/local/bin/composer update typo3/phar-stream-wrapper pear/archive_tar --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