diff --git a/.travis.yml b/.travis.yml
index be08476..86e793c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,8 @@ dist: trusty
 language: php
 
 php:
+  - 7.0
+  - 7.1
   - 7.2
   - 7.3
   - 7.4
diff --git a/composer.json b/composer.json
index 04913c6..83cd9a8 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
 	"type": "library",
     "description": "Czech inflection library",
 	"keywords": ["czech", "inflection", "declension", "language", "linguistics"],
-	"license": ["GPL-2.1"],
+	"license": ["LGPL-2.1-or-later"],
     "authors": [
         {
             "name": "Pavel Sedlák",
@@ -20,8 +20,10 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": ">=7.2.0",
-        "phpunit/phpunit": "~8.0"
+        "php": ">=7.0.0"
+    },
+    "require-dev": {
+      "phpunit/phpunit": "~6"
     },
     "autoload": {
         "files": ["src/Inflection.php"]
diff --git a/tests/InflectionTest.php b/tests/InflectionTest.php
index 831fe57..9f19447 100644
--- a/tests/InflectionTest.php
+++ b/tests/InflectionTest.php
@@ -19,7 +19,7 @@ class InflectionTest extends \PHPUnit\Framework\TestCase
      */
     private $inflection = null;
 
-    protected function setUp(): void
+    protected function setUp()
     {
         parent::setUp();
         $this->inflection = new Inflection();