--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -151,7 +151,7 @@
     spec_name: create_runtime_str!("nft"),
     impl_name: create_runtime_str!("nft"),
     authoring_version: 1,
-    spec_version: 3,
+    spec_version: 4,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,