diff --git a/.travis.yml b/.travis.yml
index 32d632e..b08308b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@ cache:
 php:
   - 7.2
   - 7.3
+  - 7.4
+  - 8.0
 
 branches:
   only:
@@ -21,10 +23,19 @@ matrix:
       env: SYMFONY_VERSION='^4.4'
     - php: 7.3
       env: SYMFONY_VERSION='^4.4'
+    - php: 7.4
+      env: SYMFONY_VERSION='^4.4'
+    - php: 8.0
+      env: SYMFONY_VERSION='^4.4'
+
     - php: 7.2
       env: SYMFONY_VERSION='^5.0'
-    -   php: 7.3
-        env: SYMFONY_VERSION='^5.0'
+    - php: 7.3
+      env: SYMFONY_VERSION='^5.0'
+    - php: 7.4
+      env: SYMFONY_VERSION='^5.0'
+    - php: 8.0
+      env: SYMFONY_VERSION='^5.0'
 
 before_install:
   - sh -c 'if [ "$SYMFONY_VERSION" != "" ]; then composer require --dev --no-update symfony/symfony=$SYMFONY_VERSION; fi;'
diff --git a/Payline/WebTransaction.php b/Payline/WebTransaction.php
index 9223467..d82940d 100644
--- a/Payline/WebTransaction.php
+++ b/Payline/WebTransaction.php
@@ -11,7 +11,7 @@
 
 namespace Lolautruche\PaylineBundle\Payline;
 
-use DateTime;
+use DateTimeInterface;
 use Symfony\Component\PropertyAccess\PropertyAccess;
 
 /**
@@ -110,7 +110,7 @@ class WebTransaction
     /**
      * The order date.
      *
-     * @var DateTime
+     * @var DateTimeInterface
      */
     private $orderDate;
 
@@ -161,7 +161,7 @@ class WebTransaction
      */
     private $privateData = [];
 
-    public function __construct($amount, $orderRef, DateTime $orderDate)
+    public function __construct($amount, $orderRef, DateTimeInterface $orderDate)
     {
         $this->amount = $amount;
         $this->orderRef = $orderRef;
@@ -370,7 +370,7 @@ public function setOrderCountry($orderCountry)
     }
 
     /**
-     * @return DateTime
+     * @return DateTimeInterface
      */
     public function getOrderDate()
     {
@@ -378,11 +378,11 @@ public function getOrderDate()
     }
 
     /**
-     * @param DateTime $orderDate
+     * @param DateTimeInterface $orderDate
      *
      * @return WebTransaction
      */
-    public function setOrderDate(DateTime $orderDate)
+    public function setOrderDate(DateTimeInterface $orderDate)
     {
         $this->orderDate = $orderDate;
 
diff --git a/composer.json b/composer.json
index c4de973..74cfc95 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": "^7.2.5",
+        "php": "^7.2.5|^8.0.2",
         "ext-soap": "*",
         "monext/payline-sdk": "^4.59",
         "symfony/framework-bundle": "^4.4|^5.0",