diff --git a/.travis.yml b/.travis.yml
index 6d778e49..704ae61c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -67,7 +67,7 @@ before_install:
 install:
     # To be removed when this issue will be resolved: https://github.com/composer/composer/issues/5355
     - if [[ "$COMPOSER_FLAGS" == *"--prefer-lowest"* ]]; then composer update --prefer-dist --no-interaction --prefer-stable --quiet; fi
-    - composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction
+    - COMPOSER_MEMORY_LIMIT=-1 composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction
     - vendor/bin/simple-phpunit install
 
 script: