diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 45fd98da..6d0a4072 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [7.4, 8.0, 8.1, 8.2]
+        php: [7.4, 8.0, 8.1, 8.2, 8.3]
         laravel: [6.*, 7.*, 8.*, 9.*, 10.*, 11.*]
         stability: [prefer-lowest, prefer-stable]
         os: [ubuntu-latest]
@@ -25,18 +25,26 @@ jobs:
             php: 8.1
           - laravel: 6.*
             php: 8.2
+          - laravel: 6.*
+            php: 8.3
           - laravel: 7.*
             php: 8.1
           - laravel: 7.*
             php: 8.2
+          - laravel: 7.*
+            php: 8.3
           - laravel: 8.*
             php: 8.2
             stability: prefer-lowest
+          - laravel: 8.*
+            php: 8.3
           - laravel: 9.*
             php: 7.4
           - laravel: 9.*
             php: 8.2
             stability: prefer-lowest
+          - laravel: 9.*
+            php: 8.3
           - laravel: 10.*
             php: 7.4
           - laravel: 10.*
diff --git a/composer.json b/composer.json
index c1e0eb34..3b24fb7e 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
         "illuminate/support": "^6|^7|^8.67|^9|^10|^11",
         "lcobucci/jwt": "^4.0",
         "namshi/jose": "^7.0",
-        "nesbot/carbon": "^1.0|^2.0"
+        "nesbot/carbon": "^2.0|^3.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3",
diff --git a/src/Blacklist.php b/src/Blacklist.php
index 07e79ef9..746c96d8 100644
--- a/src/Blacklist.php
+++ b/src/Blacklist.php
@@ -95,7 +95,7 @@ protected function getMinutesUntilExpired(Payload $payload)
         // get the latter of the two expiration dates and find
         // the number of minutes until the expiration date,
         // plus 1 minute to avoid overlap
-        return $exp->max($iat->addMinutes($this->refreshTTL))->addMinute()->diffInRealMinutes();
+        return round($exp->max($iat->addMinutes($this->refreshTTL))->addMinute()->diffInRealMinutes(null, true));
     }
 
     /**