diff --git a/beacon_node/beacon_chain/src/schema_change.rs b/beacon_node/beacon_chain/src/schema_change.rs
index a2ce448c93..bb1ae7c9a3 100644
--- a/beacon_node/beacon_chain/src/schema_change.rs
+++ b/beacon_node/beacon_chain/src/schema_change.rs
@@ -1,5 +1,5 @@
 //! Utilities for managing database schema changes.
-mod migration_schema_v11;
+mod migration_schema_v12;
 mod migration_schema_v6;
 mod migration_schema_v7;
 mod migration_schema_v8;
@@ -133,14 +133,14 @@ pub fn migrate_schema<T: BeaconChainTypes>(
         }
         // FIXME(sproul): stub for Sean's v10 migration
         (SchemaVersion(9), SchemaVersion(10)) => db.store_schema_version(to),
-        // Upgrade from v10 to v11 to store richer metadata in the attestation op pool.
-        (SchemaVersion(10), SchemaVersion(11)) => {
-            let ops = migration_schema_v11::upgrade_to_v11::<T>(db.clone(), log)?;
+        // Upgrade from v11 to v12 to store richer metadata in the attestation op pool.
+        (SchemaVersion(10), SchemaVersion(12)) => {
+            let ops = migration_schema_v12::upgrade_to_v12::<T>(db.clone(), log)?;
             db.store_schema_version_atomically(to, ops)
         }
-        // Downgrade from v11 to v9 to drop richer metadata from the attestation op pool.
-        (SchemaVersion(11), SchemaVersion(9)) => {
-            let ops = migration_schema_v11::downgrade_from_v11::<T>(db.clone(), log)?;
+        // Downgrade from v12 to v9 to drop richer metadata from the attestation op pool.
+        (SchemaVersion(12), SchemaVersion(11)) => {
+            let ops = migration_schema_v12::downgrade_from_v12::<T>(db.clone(), log)?;
             db.store_schema_version_atomically(to, ops)
         }
         // Anything else is an error.
diff --git a/beacon_node/beacon_chain/src/schema_change/migration_schema_v11.rs b/beacon_node/beacon_chain/src/schema_change/migration_schema_v12.rs
similarity index 69%
rename from beacon_node/beacon_chain/src/schema_change/migration_schema_v11.rs
rename to beacon_node/beacon_chain/src/schema_change/migration_schema_v12.rs
index a71f697b73..c3cdec2f6e 100644
--- a/beacon_node/beacon_chain/src/schema_change/migration_schema_v11.rs
+++ b/beacon_node/beacon_chain/src/schema_change/migration_schema_v12.rs
@@ -1,14 +1,14 @@
 use crate::beacon_chain::{BeaconChainTypes, OP_POOL_DB_KEY};
-use operation_pool::{PersistedOperationPool, PersistedOperationPoolV11, PersistedOperationPoolV5};
+use operation_pool::{PersistedOperationPool, PersistedOperationPoolV12, PersistedOperationPoolV5};
 use slog::{debug, info, Logger};
 use std::sync::Arc;
 use store::{Error, HotColdDB, KeyValueStoreOp, StoreItem};
 
-pub fn upgrade_to_v11<T: BeaconChainTypes>(
+pub fn upgrade_to_v12<T: BeaconChainTypes>(
     db: Arc<HotColdDB<T::EthSpec, T::HotStore, T::ColdStore>>,
     log: Logger,
 ) -> Result<Vec<KeyValueStoreOp>, Error> {
-    // Load a V5 op pool and transform it to V11.
+    // Load a V5 op pool and transform it to V12.
     let v5 = if let Some(op_pool) =
         db.get_item::<PersistedOperationPoolV5<T::EthSpec>>(&OP_POOL_DB_KEY)?
     {
@@ -24,22 +24,22 @@ pub fn upgrade_to_v11<T: BeaconChainTypes>(
     );
 
     // FIXME(sproul): work out whether it's worth trying to carry across the attestations
-    let v11 = PersistedOperationPool::V11(PersistedOperationPoolV11 {
+    let v12 = PersistedOperationPool::V12(PersistedOperationPoolV12 {
         attestations: vec![],
         sync_contributions: v5.sync_contributions,
         attester_slashings: v5.attester_slashings,
         proposer_slashings: v5.proposer_slashings,
         voluntary_exits: v5.voluntary_exits,
     });
-    Ok(vec![v11.as_kv_store_op(OP_POOL_DB_KEY)])
+    Ok(vec![v12.as_kv_store_op(OP_POOL_DB_KEY)])
 }
 
-pub fn downgrade_from_v11<T: BeaconChainTypes>(
+pub fn downgrade_from_v12<T: BeaconChainTypes>(
     db: Arc<HotColdDB<T::EthSpec, T::HotStore, T::ColdStore>>,
     log: Logger,
 ) -> Result<Vec<KeyValueStoreOp>, Error> {
-    // Load a V11 op pool and transform it to V5.
-    let v11 = if let Some(PersistedOperationPool::V11(op_pool)) =
+    // Load a V12 op pool and transform it to V5.
+    let v12 = if let Some(PersistedOperationPool::V12(op_pool)) =
         db.get_item::<PersistedOperationPool<T::EthSpec>>(&OP_POOL_DB_KEY)?
     {
         op_pool
@@ -50,15 +50,15 @@ pub fn downgrade_from_v11<T: BeaconChainTypes>(
     info!(
         log,
         "Dropping attestations from pool";
-        "count" => v11.attestations.len(),
+        "count" => v12.attestations.len(),
     );
 
     let v5 = PersistedOperationPoolV5 {
         attestations_v5: vec![],
-        sync_contributions: v11.sync_contributions,
-        attester_slashings: v11.attester_slashings,
-        proposer_slashings: v11.proposer_slashings,
-        voluntary_exits: v11.voluntary_exits,
+        sync_contributions: v12.sync_contributions,
+        attester_slashings: v12.attester_slashings,
+        proposer_slashings: v12.proposer_slashings,
+        voluntary_exits: v12.voluntary_exits,
     };
     Ok(vec![v5.as_kv_store_op(OP_POOL_DB_KEY)])
 }
diff --git a/beacon_node/operation_pool/src/lib.rs b/beacon_node/operation_pool/src/lib.rs
index 3d9303c214..821a77c004 100644
--- a/beacon_node/operation_pool/src/lib.rs
+++ b/beacon_node/operation_pool/src/lib.rs
@@ -12,7 +12,7 @@ pub use attestation::AttMaxCover;
 pub use attestation_storage::{AttestationRef, SplitAttestation};
 pub use max_cover::MaxCover;
 pub use persistence::{
-    PersistedOperationPool, PersistedOperationPoolV11, PersistedOperationPoolV5,
+    PersistedOperationPool, PersistedOperationPoolV12, PersistedOperationPoolV5,
 };
 pub use reward_cache::RewardCache;
 
diff --git a/beacon_node/operation_pool/src/persistence.rs b/beacon_node/operation_pool/src/persistence.rs
index d8114ca5db..9d7d154e68 100644
--- a/beacon_node/operation_pool/src/persistence.rs
+++ b/beacon_node/operation_pool/src/persistence.rs
@@ -18,7 +18,7 @@ type PersistedSyncContributions<T> = Vec<(SyncAggregateId, Vec<SyncCommitteeCont
 /// Operations are stored in arbitrary order, so it's not a good idea to compare instances
 /// of this type (or its encoded form) for equality. Convert back to an `OperationPool` first.
 #[superstruct(
-    variants(V5, V11),
+    variants(V5, V12),
     variant_attributes(
         derive(Derivative, PartialEq, Debug, Serialize, Deserialize, Encode, Decode),
         serde(bound = "T: EthSpec", deny_unknown_fields),
@@ -35,7 +35,7 @@ pub struct PersistedOperationPool<T: EthSpec> {
     #[superstruct(only(V5))]
     pub attestations_v5: Vec<(AttestationId, Vec<Attestation<T>>)>,
     /// Attestations and their attesting indices.
-    #[superstruct(only(V11))]
+    #[superstruct(only(V12))]
     pub attestations: Vec<(Attestation<T>, Vec<u64>)>,
     /// Mapping from sync contribution ID to sync contributions and aggregate.
     pub sync_contributions: PersistedSyncContributions<T>,
@@ -90,7 +90,7 @@ impl<T: EthSpec> PersistedOperationPool<T> {
             .map(|(_, exit)| exit.clone())
             .collect();
 
-        PersistedOperationPool::V11(PersistedOperationPoolV11 {
+        PersistedOperationPool::V12(PersistedOperationPoolV12 {
             attestations,
             sync_contributions,
             attester_slashings,
@@ -119,7 +119,7 @@ impl<T: EthSpec> PersistedOperationPool<T> {
         let sync_contributions = RwLock::new(self.sync_contributions().iter().cloned().collect());
         let attestations = match self {
             PersistedOperationPool::V5(_) => return Err(OpPoolError::IncorrectOpPoolVariant),
-            PersistedOperationPool::V11(pool) => {
+            PersistedOperationPool::V12(pool) => {
                 let mut map = AttestationMap::default();
                 for (att, attesting_indices) in pool.attestations {
                     map.insert(att, attesting_indices);
@@ -154,7 +154,7 @@ impl<T: EthSpec> StoreItem for PersistedOperationPoolV5<T> {
     }
 }
 
-/// Deserialization for `PersistedOperationPool` defaults to `PersistedOperationPool::V11`.
+/// Deserialization for `PersistedOperationPool` defaults to `PersistedOperationPool::V12`.
 impl<T: EthSpec> StoreItem for PersistedOperationPool<T> {
     fn db_column() -> DBColumn {
         DBColumn::OpPool
@@ -166,8 +166,8 @@ impl<T: EthSpec> StoreItem for PersistedOperationPool<T> {
 
     fn from_store_bytes(bytes: &[u8]) -> Result<Self, StoreError> {
         // Default deserialization to the latest variant.
-        PersistedOperationPoolV11::from_ssz_bytes(bytes)
-            .map(Self::V11)
+        PersistedOperationPoolV12::from_ssz_bytes(bytes)
+            .map(Self::V12)
             .map_err(Into::into)
     }
 }