diff --git a/tests/notification/fixtures/services_notification.yml b/tests/notification/fixtures/services_notification.yml
index c83d8bd323..470768d986 100644
--- a/tests/notification/fixtures/services_notification.yml
+++ b/tests/notification/fixtures/services_notification.yml
@@ -38,9 +38,6 @@ services:
     groupposition.teampage:
         synthetic: true
 
-    groupposition.teampage:
-        synthetic: true
-
     text_formatter.s9e.factory:
         synthetic: true
 
diff --git a/travis/setup-phpbb.sh b/travis/setup-phpbb.sh
index be9eb703d5..82cec22058 100755
--- a/travis/setup-phpbb.sh
+++ b/travis/setup-phpbb.sh
@@ -38,4 +38,11 @@ fi
 
 cd phpBB
 php ../composer.phar install --dev --no-interaction
+if [ "$TRAVIS_PHP_VERSION" == "nightly" ]
+then
+	php ../composer.phar config minimum-stability dev \
+	&& php ../composer.phar config prefer-stable true \
+	&& php ../composer.phar remove phpunit/dbunit --dev --update-with-dependencies \
+	&& php ../composer.phar require symfony/yaml:~4.4 misantron/dbunit:~5.0 phpunit/phpunit:^9.3 --dev --update-with-dependencies --ignore-platform-reqs
+fi
 cd ..