diff --git a/.travis.yml b/.travis.yml
index 24888140..f5866b98 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,7 @@ cache:
 before_script:
   # Deactivate xdebug
   - if [[ $TRAVIS_PHP_VERSION != nightly ]]; then phpenv config-rm xdebug.ini; fi
+  - if [[ $TRAVIS_PHP_VERSION == nightly ]]; then rm composer.lock; fi
   - if [[ $TRAVIS_PHP_VERSION == nightly ]]; then cp composer.php8.json composer.json; fi
   - composer install --ignore-platform-reqs