diff --git a/src/vnet/session/session.api b/src/vnet/session/session.api
index 2f5e452..911ffa6 100644
--- a/src/vnet/session/session.api
+++ b/src/vnet/session/session.api
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-option version = "3.1.0";
+option version = "3.2.0";
 
 import "vnet/interface_types.api";
 import "vnet/ip/ip_types.api";
@@ -37,7 +37,7 @@
  define app_attach {
     u32 client_index;
     u32 context;
-    u64 options[17];
+    u64 options[18];
     string namespace_id[];
  };