diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a6eb23d..f6b95591 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.5.4
+
+* fixed jwt authentication
+
 ## 1.5.3
 
 * removed query id in prepare statement
diff --git a/src/Jwt/Jwt.php b/src/Jwt/Jwt.php
index 0df4997b..0999cf7e 100644
--- a/src/Jwt/Jwt.php
+++ b/src/Jwt/Jwt.php
@@ -54,7 +54,7 @@ public function issuedBy($value)
      */
 	public function issuedAt(DateTimeInterface $value)
 	{
-		$this->payload['iat'] = $value->format('U');
+		$this->payload['iat'] = $value->getTimestamp();
 		return $this;
 	}
 
@@ -64,7 +64,7 @@ public function issuedAt(DateTimeInterface $value)
      */
 	public function expiresAt(DateTimeInterface $value)
 	{
-		$this->payload['exp'] = $value->format('U');
+		$this->payload['exp'] = $value->getTimestamp();
 		return $this;
 	}