diff --git a/cli/src/commands/compatibility.rs b/cli/src/commands/compatibility.rs
index 3071c5b2f5..1c621eaa3b 100644
--- a/cli/src/commands/compatibility.rs
+++ b/cli/src/commands/compatibility.rs
@@ -10,7 +10,7 @@ use color_eyre::eyre::{
 use frame_metadata::{
     RuntimeMetadata,
     RuntimeMetadataPrefixed,
-    RuntimeMetadataV14,
+    RuntimeMetadataV15,
     META_RESERVED,
 };
 use jsonrpsee::client_transport::ws::Uri;
@@ -110,7 +110,7 @@ async fn handle_full_metadata(nodes: &[Uri]) -> color_eyre::Result<()> {
     Ok(())
 }
 
-async fn fetch_runtime_metadata(url: &Uri) -> color_eyre::Result<RuntimeMetadataV14> {
+async fn fetch_runtime_metadata(url: &Uri) -> color_eyre::Result<RuntimeMetadataV15> {
     let bytes = subxt_codegen::utils::fetch_metadata_bytes(url).await?;
 
     let metadata = <RuntimeMetadataPrefixed as Decode>::decode(&mut &bytes[..])?;
@@ -124,7 +124,7 @@ async fn fetch_runtime_metadata(url: &Uri) -> color_eyre::Result<RuntimeMetadata
     }
 
     match metadata.1 {
-        RuntimeMetadata::V14(v14) => Ok(v14),
+        RuntimeMetadata::V15(v15) => Ok(v15),
         _ => {
             Err(eyre::eyre!(
                 "Node {:?} with unsupported metadata version: {:?}",
diff --git a/codegen/src/api/calls.rs b/codegen/src/api/calls.rs
index 9b0cbfe97f..23e9aae27c 100644
--- a/codegen/src/api/calls.rs
+++ b/codegen/src/api/calls.rs
@@ -10,7 +10,7 @@ use crate::{
     CratePath,
 };
 use frame_metadata::{
-    v14::RuntimeMetadataV14,
+    v15::RuntimeMetadataV15,
     PalletMetadata,
 };
 use heck::{
@@ -35,7 +35,7 @@ use scale_info::form::PortableForm;
 /// - `pallet` - Pallet metadata from which the calls are generated.
 /// - `types_mod_ident` - The ident of the base module that we can use to access the generated types from.
 pub fn generate_calls(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     type_gen: &TypeGenerator,
     pallet: &PalletMetadata<PortableForm>,
     types_mod_ident: &syn::Ident,
diff --git a/codegen/src/api/constants.rs b/codegen/src/api/constants.rs
index 73ef80b134..91b59a1e01 100644
--- a/codegen/src/api/constants.rs
+++ b/codegen/src/api/constants.rs
@@ -7,7 +7,7 @@ use crate::{
     CratePath,
 };
 use frame_metadata::{
-    v14::RuntimeMetadataV14,
+    v15::RuntimeMetadataV15,
     PalletMetadata,
 };
 use heck::ToSnakeCase as _;
@@ -43,7 +43,7 @@ use scale_info::form::PortableForm;
 /// - `pallet` - Pallet metadata from which the calls are generated.
 /// - `types_mod_ident` - The ident of the base module that we can use to access the generated types from.
 pub fn generate_constants(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     type_gen: &TypeGenerator,
     pallet: &PalletMetadata<PortableForm>,
     types_mod_ident: &syn::Ident,
diff --git a/codegen/src/api/mod.rs b/codegen/src/api/mod.rs
index b0a3314d8d..fec27acede 100644
--- a/codegen/src/api/mod.rs
+++ b/codegen/src/api/mod.rs
@@ -28,7 +28,7 @@ use crate::{
 };
 use codec::Decode;
 use frame_metadata::{
-    v14::RuntimeMetadataV14,
+    v15::RuntimeMetadataV15,
     RuntimeMetadata,
     RuntimeMetadataPrefixed,
 };
@@ -144,7 +144,7 @@ pub fn generate_runtime_api_from_bytes(
 
 /// Create the API for interacting with a Substrate runtime.
 pub struct RuntimeGenerator {
-    metadata: RuntimeMetadataV14,
+    metadata: RuntimeMetadataV15,
 }
 
 impl RuntimeGenerator {
@@ -155,7 +155,7 @@ impl RuntimeGenerator {
     /// from that.
     pub fn new(metadata: RuntimeMetadataPrefixed) -> Self {
         match metadata.1 {
-            RuntimeMetadata::V14(v14) => Self { metadata: v14 },
+            RuntimeMetadata::V15(v15) => Self { metadata: v15 },
             _ => panic!("Unsupported metadata version {:?}", metadata.1),
         }
     }
diff --git a/codegen/src/api/storage.rs b/codegen/src/api/storage.rs
index 2168abe760..5097afa88b 100644
--- a/codegen/src/api/storage.rs
+++ b/codegen/src/api/storage.rs
@@ -7,7 +7,7 @@ use crate::{
     CratePath,
 };
 use frame_metadata::{
-    v14::RuntimeMetadataV14,
+    v15::RuntimeMetadataV15,
     PalletMetadata,
     StorageEntryMetadata,
     StorageEntryModifier,
@@ -36,7 +36,7 @@ use scale_info::{
 /// - `pallet` - Pallet metadata from which the storages are generated.
 /// - `types_mod_ident` - The ident of the base module that we can use to access the generated types from.
 pub fn generate_storage(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     type_gen: &TypeGenerator,
     pallet: &PalletMetadata<PortableForm>,
     types_mod_ident: &syn::Ident,
@@ -70,7 +70,7 @@ pub fn generate_storage(
 }
 
 fn generate_storage_entry_fns(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     type_gen: &TypeGenerator,
     pallet: &PalletMetadata<PortableForm>,
     storage_entry: &StorageEntryMetadata<PortableForm>,
diff --git a/metadata/benches/bench.rs b/metadata/benches/bench.rs
index a0adb1ab44..824a800b26 100644
--- a/metadata/benches/bench.rs
+++ b/metadata/benches/bench.rs
@@ -5,9 +5,9 @@
 use codec::Decode;
 use criterion::*;
 use frame_metadata::{
-    RuntimeMetadata::V14,
+    RuntimeMetadata::V15,
     RuntimeMetadataPrefixed,
-    RuntimeMetadataV14,
+    RuntimeMetadataV15,
 };
 use scale_info::{
     form::PortableForm,
@@ -26,14 +26,14 @@ use subxt_metadata::{
     get_storage_hash,
 };
 
-fn load_metadata() -> RuntimeMetadataV14 {
+fn load_metadata() -> RuntimeMetadataV15 {
     let bytes = fs::read(Path::new("../artifacts/polkadot_metadata.scale"))
         .expect("Cannot read metadata blob");
     let meta: RuntimeMetadataPrefixed =
         Decode::decode(&mut &*bytes).expect("Cannot decode scale metadata");
 
     match meta.1 {
-        V14(v14) => v14,
+        V15(v15) => v15,
         _ => panic!("Unsupported metadata version {:?}", meta.1),
     }
 }
diff --git a/metadata/src/lib.rs b/metadata/src/lib.rs
index e9a5aeeb8b..b5dfd7ad8c 100644
--- a/metadata/src/lib.rs
+++ b/metadata/src/lib.rs
@@ -4,7 +4,7 @@
 
 use frame_metadata::{
     ExtrinsicMetadata,
-    RuntimeMetadataV14,
+    RuntimeMetadataV15,
     StorageEntryMetadata,
     StorageEntryType,
 };
@@ -247,7 +247,7 @@ fn get_storage_entry_hash(
 
 /// Obtain the hash for a specific storage item, or an error if it's not found.
 pub fn get_storage_hash(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     pallet_name: &str,
     storage_name: &str,
 ) -> Result<[u8; 32], NotFound> {
@@ -271,7 +271,7 @@ pub fn get_storage_hash(
 
 /// Obtain the hash for a specific constant, or an error if it's not found.
 pub fn get_constant_hash(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     pallet_name: &str,
     constant_name: &str,
 ) -> Result<[u8; 32], NotFound> {
@@ -294,7 +294,7 @@ pub fn get_constant_hash(
 
 /// Obtain the hash for a specific call, or an error if it's not found.
 pub fn get_call_hash(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     pallet_name: &str,
     call_name: &str,
 ) -> Result<[u8; 32], NotFound> {
@@ -370,8 +370,8 @@ pub fn get_pallet_hash(
     bytes
 }
 
-/// Obtain the hash representation of a `frame_metadata::RuntimeMetadataV14`.
-pub fn get_metadata_hash(metadata: &RuntimeMetadataV14) -> [u8; 32] {
+/// Obtain the hash representation of a `frame_metadata::RuntimeMetadataV15`.
+pub fn get_metadata_hash(metadata: &RuntimeMetadataV15) -> [u8; 32] {
     // Collect all pairs of (pallet name, pallet hash).
     let mut pallets: Vec<(&str, [u8; 32])> = metadata
         .pallets
@@ -405,7 +405,7 @@ pub fn get_metadata_hash(metadata: &RuntimeMetadataV14) -> [u8; 32] {
     hash(&bytes)
 }
 
-/// Obtain the hash representation of a `frame_metadata::RuntimeMetadataV14`
+/// Obtain the hash representation of a `frame_metadata::RuntimeMetadataV15`
 /// hashing only the provided pallets.
 ///
 /// **Note:** This is similar to `get_metadata_hash`, but performs hashing only of the provided
@@ -413,7 +413,7 @@ pub fn get_metadata_hash(metadata: &RuntimeMetadataV14) -> [u8; 32] {
 /// the pallets from the static metadata. In those cases, the static API can communicate
 /// properly with the subset of pallets from the runtime node.
 pub fn get_metadata_per_pallet_hash<T: AsRef<str>>(
-    metadata: &RuntimeMetadataV14,
+    metadata: &RuntimeMetadataV15,
     pallets: &[T],
 ) -> [u8; 32] {
     // Collect all pairs of (pallet name, pallet hash).
@@ -471,7 +471,7 @@ mod tests {
         PalletEventMetadata,
         PalletMetadata,
         PalletStorageMetadata,
-        RuntimeMetadataV14,
+        RuntimeMetadataV15,
         StorageEntryMetadata,
         StorageEntryModifier,
     };
@@ -570,8 +570,8 @@ mod tests {
         ]
     }
 
-    fn pallets_to_metadata(pallets: Vec<PalletMetadata>) -> RuntimeMetadataV14 {
-        RuntimeMetadataV14::new(pallets, build_default_extrinsic(), meta_type::<()>())
+    fn pallets_to_metadata(pallets: Vec<PalletMetadata>) -> RuntimeMetadataV15 {
+        RuntimeMetadataV15::new(pallets, build_default_extrinsic(), meta_type::<()>())
     }
 
     #[test]
diff --git a/subxt/src/events/events_type.rs b/subxt/src/events/events_type.rs
index 7efc7d93d4..584b2b4d40 100644
--- a/subxt/src/events/events_type.rs
+++ b/subxt/src/events/events_type.rs
@@ -404,11 +404,11 @@ pub(crate) mod test_utils {
     };
     use codec::Encode;
     use frame_metadata::{
-        v14::{
+        v15::{
             ExtrinsicMetadata,
             PalletEventMetadata,
             PalletMetadata,
-            RuntimeMetadataV14,
+            RuntimeMetadataV15,
         },
         RuntimeMetadataPrefixed,
     };
@@ -464,8 +464,8 @@ pub(crate) mod test_utils {
             signed_extensions: vec![],
         };
 
-        let v14 = RuntimeMetadataV14::new(pallets, extrinsic, meta_type::<()>());
-        let runtime_metadata: RuntimeMetadataPrefixed = v14.into();
+        let v15 = RuntimeMetadataV15::new(pallets, extrinsic, meta_type::<()>(), vec![]);
+        let runtime_metadata: RuntimeMetadataPrefixed = v15.into();
 
         Metadata::try_from(runtime_metadata).unwrap()
     }
diff --git a/subxt/src/metadata/metadata_type.rs b/subxt/src/metadata/metadata_type.rs
index f63cf08838..be42e8bb77 100644
--- a/subxt/src/metadata/metadata_type.rs
+++ b/subxt/src/metadata/metadata_type.rs
@@ -8,7 +8,7 @@ use frame_metadata::{
     PalletConstantMetadata,
     RuntimeMetadata,
     RuntimeMetadataPrefixed,
-    RuntimeMetadataV14,
+    RuntimeMetadataV15,
     StorageEntryMetadata,
     META_RESERVED,
 };
@@ -77,7 +77,7 @@ pub enum MetadataError {
 // We hide the innards behind an Arc so that it's easy to clone and share.
 #[derive(Debug)]
 struct MetadataInner {
-    metadata: RuntimeMetadataV14,
+    metadata: RuntimeMetadataV15,
     pallets: HashMap<String, PalletMetadata>,
     events: HashMap<(u8, u8), EventMetadata>,
     // Errors are hashed by pallet index.
@@ -153,7 +153,7 @@ impl Metadata {
     }
 
     /// Return the runtime metadata.
-    pub fn runtime_metadata(&self) -> &RuntimeMetadataV14 {
+    pub fn runtime_metadata(&self) -> &RuntimeMetadataV15 {
         &self.inner.metadata
     }
 
@@ -417,7 +417,7 @@ impl TryFrom<RuntimeMetadataPrefixed> for Metadata {
             return Err(InvalidMetadataError::InvalidPrefix)
         }
         let metadata = match metadata.1 {
-            RuntimeMetadata::V14(meta) => meta,
+            RuntimeMetadata::V15(meta) => meta,
             _ => return Err(InvalidMetadataError::InvalidVersion),
         };
 
@@ -596,7 +596,7 @@ mod tests {
             error: None,
         };
 
-        let metadata = RuntimeMetadataV14::new(
+        let metadata = RuntimeMetadataV15::new(
             vec![pallet],
             ExtrinsicMetadata {
                 ty: meta_type::<()>(),
diff --git a/testing/integration-tests/src/blocks/mod.rs b/testing/integration-tests/src/blocks/mod.rs
index a3730752fd..0434e1664a 100644
--- a/testing/integration-tests/src/blocks/mod.rs
+++ b/testing/integration-tests/src/blocks/mod.rs
@@ -109,7 +109,7 @@ async fn runtime_api_call() -> Result<(), subxt::Error> {
     let _ = <Compact<u32>>::decode(cursor)?;
     let meta: RuntimeMetadataPrefixed = Decode::decode(cursor)?;
     let metadata_call = match meta.1 {
-        frame_metadata::RuntimeMetadata::V14(metadata) => metadata,
+        frame_metadata::RuntimeMetadata::V15(metadata) => metadata,
         _ => panic!("Metadata V14 unavailable"),
     };
 
diff --git a/testing/integration-tests/src/client/mod.rs b/testing/integration-tests/src/client/mod.rs
index f3323ac93d..03f015f079 100644
--- a/testing/integration-tests/src/client/mod.rs
+++ b/testing/integration-tests/src/client/mod.rs
@@ -309,7 +309,7 @@ async fn rpc_state_call() {
     let _ = <Compact<u32>>::decode(cursor).unwrap();
     let meta: RuntimeMetadataPrefixed = Decode::decode(cursor).unwrap();
     let metadata_call = match meta.1 {
-        frame_metadata::RuntimeMetadata::V14(metadata) => metadata,
+        frame_metadata::RuntimeMetadata::V15(metadata) => metadata,
         _ => panic!("Metadata V14 unavailable"),
     };
 
diff --git a/testing/integration-tests/src/codegen/codegen_documentation.rs b/testing/integration-tests/src/codegen/codegen_documentation.rs
index 236e53c8b3..97e48edb6d 100644
--- a/testing/integration-tests/src/codegen/codegen_documentation.rs
+++ b/testing/integration-tests/src/codegen/codegen_documentation.rs
@@ -19,7 +19,7 @@ fn metadata_docs() -> Vec<String> {
     // Load the runtime metadata downloaded from a node via `test-runtime`.
     let meta = load_test_metadata();
     let metadata = match meta.1 {
-        frame_metadata::RuntimeMetadata::V14(v14) => v14,
+        frame_metadata::RuntimeMetadata::V15(v15) => v15,
         _ => panic!("Unsupported metadata version {:?}", meta.1),
     };
 
diff --git a/testing/integration-tests/src/metadata/validation.rs b/testing/integration-tests/src/metadata/validation.rs
index 5d8efcb4ea..aeba75b72a 100644
--- a/testing/integration-tests/src/metadata/validation.rs
+++ b/testing/integration-tests/src/metadata/validation.rs
@@ -13,7 +13,7 @@ use frame_metadata::{
     PalletMetadata,
     PalletStorageMetadata,
     RuntimeMetadataPrefixed,
-    RuntimeMetadataV14,
+    RuntimeMetadataV15,
     StorageEntryMetadata,
     StorageEntryModifier,
     StorageEntryType,
@@ -35,7 +35,7 @@ use subxt::{
 };
 
 async fn metadata_to_api(
-    metadata: RuntimeMetadataV14,
+    metadata: RuntimeMetadataV15,
     ctx: &TestContext,
 ) -> OfflineClient<SubstrateConfig> {
     let prefixed = RuntimeMetadataPrefixed::from(metadata);
@@ -57,7 +57,7 @@ async fn full_metadata_check() {
     assert!(node_runtime::validate_codegen(&api).is_ok());
 
     // Modify the metadata.
-    let mut metadata: RuntimeMetadataV14 = api.metadata().runtime_metadata().clone();
+    let mut metadata: RuntimeMetadataV15 = api.metadata().runtime_metadata().clone();
     metadata.pallets[0].name = "NewPallet".to_string();
 
     let api = metadata_to_api(metadata, &ctx).await;
@@ -79,7 +79,7 @@ async fn constant_values_are_not_validated() {
     assert!(api.constants().at(&deposit_addr).is_ok());
 
     // Modify the metadata.
-    let mut metadata: RuntimeMetadataV14 = api.metadata().runtime_metadata().clone();
+    let mut metadata: RuntimeMetadataV15 = api.metadata().runtime_metadata().clone();
 
     let mut existential = metadata
         .pallets
@@ -112,8 +112,8 @@ fn default_pallet() -> PalletMetadata {
     }
 }
 
-fn pallets_to_metadata(pallets: Vec<PalletMetadata>) -> RuntimeMetadataV14 {
-    RuntimeMetadataV14::new(
+fn pallets_to_metadata(pallets: Vec<PalletMetadata>) -> RuntimeMetadataV15 {
+    RuntimeMetadataV15::new(
         pallets,
         ExtrinsicMetadata {
             ty: meta_type::<()>(),
diff --git a/testing/ui-tests/src/utils/mod.rs b/testing/ui-tests/src/utils/mod.rs
index 698e001589..4b2e0f4e39 100644
--- a/testing/ui-tests/src/utils/mod.rs
+++ b/testing/ui-tests/src/utils/mod.rs
@@ -6,7 +6,7 @@ pub mod dispatch_error;
 mod metadata_test_runner;
 
 use frame_metadata::{
-    v14::RuntimeMetadataV14,
+    v15::RuntimeMetadataV15,
     ExtrinsicMetadata,
     PalletMetadata,
     PalletStorageMetadata,
@@ -36,7 +36,7 @@ pub fn generate_metadata_from_pallets_custom_dispatch_error<
         signed_extensions: vec![],
     };
 
-    // Construct metadata manually from our types (See `RuntimeMetadataV14::new()`).
+    // Construct metadata manually from our types (See `RuntimeMetadataV15::new()`).
     // Add any extra types we need to the registry.
     let mut registry = scale_info::Registry::new();
     let pallets = registry.map_into_portable(pallets);
@@ -46,7 +46,7 @@ pub fn generate_metadata_from_pallets_custom_dispatch_error<
     // Metadata needs to contain this DispatchError, since codegen looks for it.
     registry.register_type(&meta_type::<DispatchError>());
 
-    let metadata = RuntimeMetadataV14 {
+    let metadata = RuntimeMetadataV15 {
         types: registry.into(),
         pallets,
         extrinsic,