diff --git a/.travis.yml b/.travis.yml
index 44cd443..aa89434 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,8 @@ php:
   - 7.0
   - 7.1.0
   - 7.2
+  - 7.3
+  - 7.4
 
 env:
   matrix:
@@ -23,7 +25,7 @@ before_install:
     fi
 
 install:
-  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-dist --no-suggest
+  - COMPOSER_MEMORY_LIMIT=-1 travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-dist --no-suggest
 
 script:
   - make lint