diff --git a/.travis.yml b/.travis.yml
index d439e93..e6e88e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,16 +13,18 @@ matrix:
   fast_finish: true
 
 install:
-  - composer install
+  # --ignore-platform-reqs, because https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/2722
+  - composer update -n --prefer-dist --ignore-platform-reqs
+  - composer require satooshi/php-coveralls dev-master --ignore-platform-reqs
+
   - travis/install-eio.sh
   - travis/install-uv.sh
 
 script:
   - phpdbg -qrr vendor/bin/phpunit --coverage-text --coverage-clover build/logs/clover.xml
-  - php vendor/bin/php-cs-fixer --diff --dry-run -v fix
+  - PHP_CS_FIXER_IGNORE_ENV=1 php vendor/bin/php-cs-fixer --diff --dry-run -v fix
 
 after_script:
-  - composer require satooshi/php-coveralls:dev-master
   - php vendor/bin/coveralls -v
 
 cache: