diff --git a/.travis.yml b/.travis.yml
index 2e6f2ca..46fb446 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,8 @@ php:
   - 7.2
   - 7.3
   - 7.4
+  - 8.0
+  - 8.1
 
 matrix:
   include:
diff --git a/composer.json b/composer.json
index a5aab45..1dbcdbd 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
   ],
   "license": "MIT",
   "require": {
-    "php": "^7.1",
+    "php": "^7.1|^8.0",
 
     "psr/http-message": "^1.0",
     "psr/http-factory": "^1.0",