diff --git a/composer.json b/composer.json
index 9845103..307d4f0 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         }
     ],
     "require" : {
-        "php": "^7.0|^8.0"
+        "php": "^7.1|^8.0"
     },
     "require-dev": {
         "mikey179/vfsstream": "^1.6",
diff --git a/src/Template/Func.php b/src/Template/Func.php
index 79141f4..5ff5093 100644
--- a/src/Template/Func.php
+++ b/src/Template/Func.php
@@ -89,11 +89,11 @@ public function getCallback()
 
     /**
      * Call the function.
-     * @param  Template $template
-     * @param  array    $arguments
+     * @param Template|null $template
+     * @param array         $arguments
      * @return mixed
      */
-    public function call(Template $template = null, $arguments = array())
+    public function call(?Template $template = null, $arguments = array())
     {
         if (is_array($this->callback) and
             isset($this->callback[0]) and
diff --git a/src/Template/Template.php b/src/Template/Template.php
index db11a9f..5473c9e 100644
--- a/src/Template/Template.php
+++ b/src/Template/Template.php
@@ -109,10 +109,10 @@ public function __toString()
 
     /**
      * Assign or get template data.
-     * @param  array $data
-     * @return mixed
+     * @param array|null $data
+     * @return array|void
      */
-    public function data(array $data = null)
+    public function data(?array $data = null)
     {
         if (is_null($data)) {
             return $this->data;