diff --git a/.travis.yml b/.travis.yml
index d4f7c8e..5cf8e6a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,9 @@
 language: php
 
 php:
-- "7.1"
 - "7.2"
 - "7.3"
+- "7.4"
 
 before_script:
 - composer install
diff --git a/composer.json b/composer.json
index 132de4d..09e8ccd 100644
--- a/composer.json
+++ b/composer.json
@@ -30,9 +30,9 @@
     "require": {
         "react/socket": "~1.2",
         "react/datagram": "^1.4",
-        "php": "~7.1",
-        "ext-json": "~1.0",
-        "ext-simplexml": "*",
+        "php": "~7.2",
+        "ext-json": "*",
+        "ext-SimpleXML": "*",
         "symfony/event-dispatcher": "~4.0",
         "psr/log": "^1.0",
         "symfony/filesystem": "^4.3",