diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index f5fcb6b49..d1614a49b 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v1105
\ No newline at end of file
+v1111
\ No newline at end of file
diff --git a/lib/Invoice.php b/lib/Invoice.php
index d054acf38..499848796 100644
--- a/lib/Invoice.php
+++ b/lib/Invoice.php
@@ -271,6 +271,23 @@ public static function update($id, $params = null, $opts = null)
     const BILLING_CHARGE_AUTOMATICALLY = 'charge_automatically';
     const BILLING_SEND_INVOICE = 'send_invoice';
 
+    /**
+     * @param null|array $params
+     * @param null|array|string $opts
+     *
+     * @throws \Stripe\Exception\ApiErrorException if the request fails
+     *
+     * @return \Stripe\Invoice the added invoice
+     */
+    public function addLines($params = null, $opts = null)
+    {
+        $url = $this->instanceUrl() . '/add_lines';
+        list($response, $opts) = $this->_request('post', $url, $params, $opts);
+        $this->refreshFrom($response, $opts);
+
+        return $this;
+    }
+
     /**
      * @param null|array $params
      * @param null|array|string $opts
@@ -340,6 +357,23 @@ public function pay($params = null, $opts = null)
         return $this;
     }
 
+    /**
+     * @param null|array $params
+     * @param null|array|string $opts
+     *
+     * @throws \Stripe\Exception\ApiErrorException if the request fails
+     *
+     * @return \Stripe\Invoice the removed invoice
+     */
+    public function removeLines($params = null, $opts = null)
+    {
+        $url = $this->instanceUrl() . '/remove_lines';
+        list($response, $opts) = $this->_request('post', $url, $params, $opts);
+        $this->refreshFrom($response, $opts);
+
+        return $this;
+    }
+
     /**
      * @param null|array $params
      * @param null|array|string $opts
@@ -393,6 +427,23 @@ public static function upcomingLines($params = null, $opts = null)
         return $obj;
     }
 
+    /**
+     * @param null|array $params
+     * @param null|array|string $opts
+     *
+     * @throws \Stripe\Exception\ApiErrorException if the request fails
+     *
+     * @return \Stripe\Invoice the updated invoice
+     */
+    public function updateLines($params = null, $opts = null)
+    {
+        $url = $this->instanceUrl() . '/update_lines';
+        list($response, $opts) = $this->_request('post', $url, $params, $opts);
+        $this->refreshFrom($response, $opts);
+
+        return $this;
+    }
+
     /**
      * @param null|array $params
      * @param null|array|string $opts
diff --git a/lib/Service/InvoiceService.php b/lib/Service/InvoiceService.php
index 1053b5a8f..a5cbd2228 100644
--- a/lib/Service/InvoiceService.php
+++ b/lib/Service/InvoiceService.php
@@ -10,6 +10,23 @@
  */
 class InvoiceService extends \Stripe\Service\AbstractService
 {
+    /**
+     * Adds multiple line items to an invoice. This is only possible when an invoice is
+     * still a draft.
+     *
+     * @param string $id
+     * @param null|array $params
+     * @param null|RequestOptionsArray|\Stripe\Util\RequestOptions $opts
+     *
+     * @throws \Stripe\Exception\ApiErrorException if the request fails
+     *
+     * @return \Stripe\Invoice
+     */
+    public function addLines($id, $params = null, $opts = null)
+    {
+        return $this->request('post', $this->buildPath('/v1/invoices/%s/add_lines', $id), $params, $opts);
+    }
+
     /**
      * You can list all invoices, or list the invoices for a specific customer. The
      * invoices are returned sorted by creation date, with the most recently created
@@ -177,6 +194,23 @@ public function pay($id, $params = null, $opts = null)
         return $this->request('post', $this->buildPath('/v1/invoices/%s/pay', $id), $params, $opts);
     }
 
+    /**
+     * Removes multiple line items from an invoice. This is only possible when an
+     * invoice is still a draft.
+     *
+     * @param string $id
+     * @param null|array $params
+     * @param null|RequestOptionsArray|\Stripe\Util\RequestOptions $opts
+     *
+     * @throws \Stripe\Exception\ApiErrorException if the request fails
+     *
+     * @return \Stripe\Invoice
+     */
+    public function removeLines($id, $params = null, $opts = null)
+    {
+        return $this->request('post', $this->buildPath('/v1/invoices/%s/remove_lines', $id), $params, $opts);
+    }
+
     /**
      * Retrieves the invoice with the given ID.
      *
@@ -338,6 +372,23 @@ public function updateLine($parentId, $id, $params = null, $opts = null)
         return $this->request('post', $this->buildPath('/v1/invoices/%s/lines/%s', $parentId, $id), $params, $opts);
     }
 
+    /**
+     * Updates multiple line items on an invoice. This is only possible when an invoice
+     * is still a draft.
+     *
+     * @param string $id
+     * @param null|array $params
+     * @param null|RequestOptionsArray|\Stripe\Util\RequestOptions $opts
+     *
+     * @throws \Stripe\Exception\ApiErrorException if the request fails
+     *
+     * @return \Stripe\Invoice
+     */
+    public function updateLines($id, $params = null, $opts = null)
+    {
+        return $this->request('post', $this->buildPath('/v1/invoices/%s/update_lines', $id), $params, $opts);
+    }
+
     /**
      * Mark a finalized invoice as void. This cannot be undone. Voiding an invoice is
      * similar to <a href="#delete_invoice">deletion</a>, however it only applies to