diff --git a/.travis.yml b/.travis.yml
index 28e48ec..4444064 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,9 +2,11 @@ dist: trusty
 language: php
 
 php:
-    - 5.5
-    - 5.6
-    - 7.0
+    - 7.2
+    - 7.4
+    - 8.0
+    - 8.1
+    - 8.2
 
 before_install:
     - phpenv config-rm xdebug.ini
diff --git a/composer.json b/composer.json
index cc4d7d0..95fe02a 100644
--- a/composer.json
+++ b/composer.json
@@ -10,11 +10,11 @@
         "homepage": "https://github.com/rezzza/command-bus/contributors"
     }],
     "require": {
-        "php": ">=5.5.0",
+        "php": ">=7.1.0",
         "psr/log": "~1.0",
-        "symfony/event-dispatcher": "~2.5|~3.0|~4.0|~5.0",
-        "symfony/serializer": "~2.5|~3.0|~4.0|~5.0",
-        "symfony/dependency-injection": "~2.5|~3.0|~4.0|~5.0",
+        "symfony/event-dispatcher": "~2.5|~3.0|~4.0|~5.0|~6.0",
+        "symfony/serializer": "~2.5|~3.0|~4.0|~5.0|~6.0",
+        "symfony/dependency-injection": "~2.5|~3.0|~4.0|~5.0|~6.0",
         "doctrine/inflector": "~1.0"
     },
     "autoload": {