diff --git a/.travis.yml b/.travis.yml
index 88406aab66..716e283cd8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ group: deprecated-2017Q4
 
 php:
   - 7.2
+  - 7.3
 
 addons:
   hosts:
@@ -29,7 +30,7 @@ env:
 before_install:
   # set GitHub token and update composer
   - if [ -n "$GH_TOKEN" ]; then composer config github-oauth.github.com ${GH_TOKEN}; fi;
-  - composer self-update && composer -V
+  - composer self-update 1.10.19 && composer -V
 #  - export USE_ZEND_ALLOC=0
   - rvm use 1.9.3 --install --fuzzy