diff --git a/eth2_libp2p b/eth2_libp2p
index 51900734..60cf6aa2 160000
--- a/eth2_libp2p
+++ b/eth2_libp2p
@@ -1 +1 @@
-Subproject commit 51900734c85b7e5d838d3a171f5b1983e7ef9a8b
+Subproject commit 60cf6aa296890b5e8d4a5dbf38fc9f4d3e5bed71
diff --git a/fork_choice_control/src/helpers.rs b/fork_choice_control/src/helpers.rs
index eaa9c82a..d7ce9f8f 100644
--- a/fork_choice_control/src/helpers.rs
+++ b/fork_choice_control/src/helpers.rs
@@ -255,7 +255,7 @@ impl<P: Preset> Context<P> {
     }
 
     pub fn on_blob_sidecar(&mut self, blob_sidecar: BlobSidecar<P>) -> Option<P2pMessage<P>> {
-        let subnet_id = misc::compute_subnet_for_blob_sidecar(self.config(), blob_sidecar.index);
+        let subnet_id = misc::compute_subnet_for_blob_sidecar(self.config(), &blob_sidecar);
 
         self.controller().on_gossip_blob_sidecar(
             Arc::new(blob_sidecar),
diff --git a/fork_choice_store/src/store.rs b/fork_choice_store/src/store.rs
index f6982510..ef147471 100644
--- a/fork_choice_store/src/store.rs
+++ b/fork_choice_store/src/store.rs
@@ -1700,7 +1700,7 @@ impl<P: Preset> Store<P> {
 
         // [REJECT] The sidecar's index is consistent with MAX_BLOBS_PER_BLOCK -- i.e. blob_sidecar.index < MAX_BLOBS_PER_BLOCK.
         let max_blobs_per_block =
-            if self.chain_config().phase_at_slot::<P>(block_header.slot) == Phase::Electra {
+            if self.chain_config().phase_at_slot::<P>(block_header.slot) >= Phase::Electra {
                 P::MaxBlobsPerBlockElectra::U64
             } else {
                 P::MaxBlobsPerBlock::U64
@@ -1713,8 +1713,7 @@ impl<P: Preset> Store<P> {
 
         // [REJECT] The sidecar is for the correct subnet -- i.e. compute_subnet_for_blob_sidecar(blob_sidecar.index) == subnet_id.
         if let Some(actual) = origin.subnet_id() {
-            let expected =
-                misc::compute_subnet_for_blob_sidecar(&self.chain_config, blob_sidecar.index);
+            let expected = misc::compute_subnet_for_blob_sidecar(&self.chain_config, &blob_sidecar);
 
             ensure!(
                 actual == expected,
diff --git a/helper_functions/src/misc.rs b/helper_functions/src/misc.rs
index 233b1b0d..e512514b 100644
--- a/helper_functions/src/misc.rs
+++ b/helper_functions/src/misc.rs
@@ -23,6 +23,7 @@ use types::{
             Blob, BlobCommitmentInclusionProof, BlobIndex, KzgCommitment, KzgProof, VersionedHash,
         },
     },
+    nonstandard::Phase,
     phase0::{
         consts::{
             AttestationSubnetCount, BLS_WITHDRAWAL_PREFIX, ETH1_ADDRESS_WITHDRAWAL_PREFIX,
@@ -279,8 +280,15 @@ pub fn compute_subnet_for_attestation<P: Preset>(
 
 /// [`compute_subnet_for_blob_sidecar`](https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/deneb/validator.md#sidecar)
 #[must_use]
-pub fn compute_subnet_for_blob_sidecar(config: &Config, blob_index: BlobIndex) -> SubnetId {
-    blob_index % config.blob_sidecar_subnet_count
+pub fn compute_subnet_for_blob_sidecar<P: Preset>(
+    config: &Config,
+    blob_sidecar: &BlobSidecar<P>,
+) -> SubnetId {
+    if config.phase_at_slot::<P>(blob_sidecar.signed_block_header.message.slot) >= Phase::Electra {
+        blob_sidecar.index % config.blob_sidecar_subnet_count_electra
+    } else {
+        blob_sidecar.index % config.blob_sidecar_subnet_count
+    }
 }
 
 /// <https://github.com/ethereum/consensus-specs/blob/v1.1.0/specs/altair/validator.md#broadcast-sync-committee-message>
diff --git a/p2p/src/network.rs b/p2p/src/network.rs
index 45432593..8a268c8c 100644
--- a/p2p/src/network.rs
+++ b/p2p/src/network.rs
@@ -547,10 +547,8 @@ impl<P: Preset> Network<P> {
     }
 
     fn publish_blob_sidecar(&self, blob_sidecar: Arc<BlobSidecar<P>>) {
-        let subnet_id = misc::compute_subnet_for_blob_sidecar(
-            self.controller.chain_config(),
-            blob_sidecar.index,
-        );
+        let subnet_id =
+            misc::compute_subnet_for_blob_sidecar(self.controller.chain_config(), &blob_sidecar);
 
         let blob_identifier: BlobIdentifier = blob_sidecar.as_ref().into();