diff --git a/.travis.yml b/.travis.yml
index aba467f..a38c93e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,19 +5,22 @@ env:
   - PREFER_LOWEST=""
 
 php:
-    - 5.4
-    - 5.5
     - 5.6
     - 7.0
     - 7.1
     - 7.2
+    - 7.3
+    - 7.4
     - nightly
-    - hhvm
 
 matrix:
+  include:
+    - php: 5.4
+      dist: trusty
+    - php: 5.5
+      dist: trusty
   allow_failures:
     - php: nightly
-    - php: hhvm
   fast_finish: true
   
 before_script:
diff --git a/composer.json b/composer.json
index f53b9aa..18cf0ca 100644
--- a/composer.json
+++ b/composer.json
@@ -19,6 +19,6 @@
       "bin-dir": "bin"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.35 || 5.* || 6.*"
+        "phpunit/phpunit": "^4.8.35 || ^5 || ^6 || ^7"
     }
 }