diff --git a/.travis.yml b/.travis.yml
index 32581e0..a18ff5e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,9 @@ language: php
 
 matrix:
   include:
+    - php: 7.1
     - php: 7.2
+    - php: nightly
   fast_finish: true
 
 sudo: false
diff --git a/README.md b/README.md
index 498231f..5643227 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Simple slugger for PHP 7.2+ based on ICU
+# Simple slugger for PHP 7.1+ based on ICU
 
 [![Gitter](https://badges.gitter.im/sunrise-php/support.png)](https://gitter.im/sunrise-php/support)
 [![Build Status](https://api.travis-ci.com/sunrise-php/slugger.svg?branch=master)](https://travis-ci.com/sunrise-php/slugger)
diff --git a/composer.json b/composer.json
index 545edb2..f9e9948 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
 		"homepage": "https://anatoly.fenric.ru/"
 	}],
 	"require": {
-		"php": "^7.2",
+		"php": "^7.1",
 		"ext-intl": "*"
 	},
 	"require-dev": {