diff --git a/.travis.yml b/.travis.yml
index 088a9cd2b2f..b0448cfa730 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,6 +25,8 @@ env:
   global:
     # For functional and acceptance tests
     - COMPOSE_FILE="doc/docker/base-dev.yml:doc/docker/selenium.yml"
+    # In order to specify extra flags like ignoring platform reqs, using only stable packages and so on.
+    - COMPOSER_FLAGS=""
 
 matrix:
   fast_finish: true
@@ -50,9 +52,13 @@ matrix:
       env: TEST_CONFIG="phpunit.xml"
     - php: 7.2
       env: ELASTICSEARCH_VERSION="1.4.2" TEST_CONFIG="phpunit-integration-legacy-elasticsearch.xml"
+# 7.3
+    # Temp: Need to use --ignore-platform-reqs due to: https://github.com/FriendsOfPHP/PHP-CS-Fixer/issues/3697
+    - php: 7.3
+      env: TEST_CONFIG="phpunit.xml" COMPOSER_FLAGS="--ignore-platform-reqs"
     - name: Legacy Storage engine tests with MariaDB 10.3
-      php: 7.1
-      env: TEST_CONFIG="phpunit-integration-legacy.xml" DB="mariadb" DATABASE="mysql://root@localhost/testdb"
+      php: 7.3
+      env: TEST_CONFIG="phpunit-integration-legacy.xml" DB="mariadb" DATABASE="mysql://root@localhost/testdb" COMPOSER_FLAGS="--ignore-platform-reqs"
       addons:
         mariadb: 10.3
 
@@ -80,7 +86,7 @@ before_install:
   - TEST_TIMEZONE=${TEST_TIMEZONES["`shuf -i 0-2 -n 1`"]}
 
 install:
-  -  if [ "$TEST_CONFIG" != "" ] ; then travis_retry composer install --no-progress --no-interaction --prefer-dist ; fi
+  -  if [ "$TEST_CONFIG" != "" ] ; then travis_retry composer install --no-progress --no-interaction --prefer-dist $COMPOSER_FLAGS; fi
   # Setup Solr / Elastic search if asked for
   - if [ "$TEST_CONFIG" = "phpunit-integration-legacy-elasticsearch.xml" ] ; then ./bin/.travis/init_elasticsearch.sh ; fi
   - if [ "$TEST_CONFIG" = "phpunit-integration-legacy-solr.xml" ] ; then ./vendor/ezsystems/ezplatform-solr-search-engine/bin/.travis/init_solr.sh; fi