diff --git a/CHANGELOG.md b/CHANGELOG.md
index be5c260..9ed912c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 2.15.0
+
+* [BC] Set default Stripe API to "2015-03-24" version. This adds the property `discountable` for `createInvoiceItem`
+and `updateInvoiceItem` for all descriptors.
+
 # 2.14.1
 
 * Fix missing import
diff --git a/README.md b/README.md
index c53210e..944a0c8 100644
--- a/README.md
+++ b/README.md
@@ -30,11 +30,11 @@ $client = new StripeClient('my-api-key');
 > You can change the API key for the client using the `setApiKey` method. This is useful if you are using Stripe
 Connect and make both your own API calls and API calls on behalf of your users.
 
-The currently latest supported version of the API is **2015-02-18**. You can (and should) also explicitly specify the version
+The currently latest supported version of the API is **2015-03-24**. You can (and should) also explicitly specify the version
 of the client using the second parameter:
 
 ```php
-$client = new StripeClient('my-api-key', '2015-02-18');
+$client = new StripeClient('my-api-key', '2015-03-24');
 ```
 
 ### Versioning
@@ -50,7 +50,7 @@ However, each new minor version (2.1.0 to 2.2.0 for instance) will update the St
 Currently, the following Stripe API versions are accepted by ZfrStripe: `2014-03-28`, `2014-05-19`, `2014-06-13`,
 `2014-06-17`, `2014-07-22`,  `2014-07-26`,  `2014-08-04`, `2014-08-20`, `2014-09-08`, `2014-10-07`, `2014-11-05`,
 `2014-11-20`, `2014-12-08`, `2014-12-17`, `2014-12-22`, `2015-01-11`, `2015-01-26`, `2015-02-10`, `2015-02-16`,
-`2015-02-18`. I will try to update the library as soon as new version are released.
+`2015-02-18`, `2015-03-24`. I will try to update the library as soon as new version are released.
 
 > If you need support for older versions, please use branch v1 of ZfrStripe.
 
diff --git a/src/Client/ServiceDescription/Stripe-v1.0.php b/src/Client/ServiceDescription/Stripe-v1.0.php
index 8c2cd04..582faab 100644
--- a/src/Client/ServiceDescription/Stripe-v1.0.php
+++ b/src/Client/ServiceDescription/Stripe-v1.0.php
@@ -2220,6 +2220,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
@@ -2361,6 +2368,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
diff --git a/src/Client/ServiceDescription/Stripe-v1.1.php b/src/Client/ServiceDescription/Stripe-v1.1.php
index bb2bd56..edd9c77 100644
--- a/src/Client/ServiceDescription/Stripe-v1.1.php
+++ b/src/Client/ServiceDescription/Stripe-v1.1.php
@@ -2220,6 +2220,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
@@ -2361,6 +2368,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
diff --git a/src/Client/ServiceDescription/Stripe-v1.2.php b/src/Client/ServiceDescription/Stripe-v1.2.php
index 831ab66..5d89e19 100644
--- a/src/Client/ServiceDescription/Stripe-v1.2.php
+++ b/src/Client/ServiceDescription/Stripe-v1.2.php
@@ -2220,6 +2220,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
@@ -2361,6 +2368,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
diff --git a/src/Client/ServiceDescription/Stripe-v1.3.php b/src/Client/ServiceDescription/Stripe-v1.3.php
index 63f922e..e83abf8 100644
--- a/src/Client/ServiceDescription/Stripe-v1.3.php
+++ b/src/Client/ServiceDescription/Stripe-v1.3.php
@@ -2220,6 +2220,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
@@ -2361,6 +2368,13 @@
                     'type'        => 'string',
                     'required'    => false
                 ],
+                'discountable' => [
+                    'description' => 'Controls whether discounts apply to this invoice item',
+                    'location'    => 'query',
+                    'type'        => 'boolean',
+                    'filters'     => ['ZfrStripe\Client\Filter\BooleanFilter::encodeValue'],
+                    'required'    => false
+                ],
                 'metadata' => [
                     'description' => 'Optional metadata',
                     'location'    => 'query',
diff --git a/src/Client/StripeClient.php b/src/Client/StripeClient.php
index a8f8282..2fd290d 100644
--- a/src/Client/StripeClient.php
+++ b/src/Client/StripeClient.php
@@ -199,7 +199,7 @@ class StripeClient extends Client
     /**
      * Stripe API version
      */
-    const LATEST_API_VERSION = '2015-02-18';
+    const LATEST_API_VERSION = '2015-03-24';
 
     /**
      * @var array
@@ -207,7 +207,7 @@ class StripeClient extends Client
     protected $availableVersions = [
         '2014-03-28', '2014-05-19', '2014-06-13', '2014-06-17', '2014-07-22', '2014-07-26', '2014-08-04', '2014-08-20',
         '2014-09-08', '2014-10-07', '2014-11-05', '2014-11-20', '2014-12-08', '2014-12-17', '2014-12-22', '2015-01-11',
-        '2015-01-26', '2015-02-10', '2015-02-16', '2015-02-18'
+        '2015-01-26', '2015-02-10', '2015-02-16', '2015-02-18', '2015-03-24'
     ];
 
     /**