diff --git a/validator_client/src/attestation_service.rs b/validator_client/src/attestation_service.rs
index 5b7f31867b..4213edc439 100644
--- a/validator_client/src/attestation_service.rs
+++ b/validator_client/src/attestation_service.rs
@@ -18,6 +18,7 @@ use types::{
     attestation::AttestationBase, AggregateSignature, Attestation, AttestationData, BitList,
     ChainSpec, CommitteeIndex, EthSpec, Slot,
 };
+use types::{AttestationElectra, BitVector, ForkName};
 
 /// Builds an `AttestationService`.
 pub struct AttestationServiceBuilder<T: SlotClock + 'static, E: EthSpec> {
@@ -362,9 +363,16 @@ impl<T: SlotClock + 'static, E: EthSpec> AttestationService<T, E> {
             let duty = &duty_and_proof.duty;
             let attestation_data = attestation_data_ref;
 
+            let fork_name = self
+                .context
+                .eth2_config
+                .spec
+                .fork_name_at_slot::<E>(attestation_data.slot);
+
             // Ensure that the attestation matches the duties.
             #[allow(clippy::suspicious_operation_groupings)]
-            if duty.slot != attestation_data.slot || duty.committee_index != attestation_data.index
+            if duty.slot != attestation_data.slot
+                || (fork_name < ForkName::Electra && duty.committee_index != attestation_data.index)
             {
                 crit!(
                     log,
@@ -378,11 +386,26 @@ impl<T: SlotClock + 'static, E: EthSpec> AttestationService<T, E> {
                 return None;
             }
 
-            let mut attestation = Attestation::Base(AttestationBase {
-                aggregation_bits: BitList::with_capacity(duty.committee_length as usize).unwrap(),
-                data: attestation_data.clone(),
-                signature: AggregateSignature::infinity(),
-            });
+            let mut attestation = if fork_name >= ForkName::Electra {
+                let mut committee_bits: BitVector<E::MaxCommitteesPerSlot> = BitVector::default();
+                committee_bits
+                    .set(duty.committee_index as usize, true)
+                    .unwrap();
+                Attestation::Electra(AttestationElectra {
+                    aggregation_bits: BitList::with_capacity(duty.committee_length as usize)
+                        .unwrap(),
+                    data: attestation_data.clone(),
+                    committee_bits,
+                    signature: AggregateSignature::infinity(),
+                })
+            } else {
+                Attestation::Base(AttestationBase {
+                    aggregation_bits: BitList::with_capacity(duty.committee_length as usize)
+                        .unwrap(),
+                    data: attestation_data.clone(),
+                    signature: AggregateSignature::infinity(),
+                })
+            };
 
             match self
                 .validator_store
@@ -531,6 +554,12 @@ impl<T: SlotClock + 'static, E: EthSpec> AttestationService<T, E> {
             .await
             .map_err(|e| e.to_string())?;
 
+        let fork_name = self
+            .context
+            .eth2_config
+            .spec
+            .fork_name_at_slot::<E>(attestation_data.slot);
+
         // Create futures to produce the signed aggregated attestations.
         let signing_futures = validator_duties.iter().map(|duty_and_proof| async move {
             let duty = &duty_and_proof.duty;
@@ -539,7 +568,9 @@ impl<T: SlotClock + 'static, E: EthSpec> AttestationService<T, E> {
             let slot = attestation_data.slot;
             let committee_index = attestation_data.index;
 
-            if duty.slot != slot || duty.committee_index != committee_index {
+            if duty.slot != slot
+                || (fork_name < ForkName::Electra && duty.committee_index != committee_index)
+            {
                 crit!(log, "Inconsistent validator duties during signing");
                 return None;
             }