diff --git a/.travis.yml b/.travis.yml
index 69b2693..2c08a47 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ cache:
 
 env:
   global:
-    - COMPOSER_ARGS="--no-interaction"
+    - COMPOSER_ARGS="--no-interaction --ignore-platform-reqs"
 
 matrix:
   fast_finish: true
@@ -35,6 +35,12 @@ matrix:
     - php: 7.4
       env:
         - DEPS=latest
+    - php: nightly
+      env:
+        - DEPS=lowest
+    - php: nightly
+      env:
+        - DEPS=latest
 
 addons:
   apt:
diff --git a/composer.json b/composer.json
index 0963244..a3372ca 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "sort-packages": true
     },
     "require": {
-        "php": "^7.1",
+        "php": "^7.3 || ~8.0.0",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.6.2 || ^0.7",
         "laminas/laminas-zendframework-bridge": "^1.0",
         "slevomat/coding-standard": "^6.4.1",