diff --git a/.circleci/config.yml b/.circleci/config.yml
index eb5c38b23b7..38c2560c4dc 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -363,7 +363,7 @@ jobs:
           path: build/test-results
 
   acceptanceTests:
-    parallelism: 5
+    parallelism: 4
     executor: machine_large_executor_amd64
     steps:
       - install_java_21
diff --git a/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/MultiPeersStandAloneVcBlocksAcceptanceTest.java b/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/MultiPeersStandAloneVcBlocksAcceptanceTest.java
index abe7d557cb7..c63f5532783 100644
--- a/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/MultiPeersStandAloneVcBlocksAcceptanceTest.java
+++ b/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/MultiPeersStandAloneVcBlocksAcceptanceTest.java
@@ -17,7 +17,6 @@
 import org.junit.jupiter.params.provider.MethodSource;
 import tech.pegasys.teku.bls.BLSKeyPair;
 import tech.pegasys.teku.infrastructure.unsigned.UInt64;
-import tech.pegasys.teku.spec.SpecMilestone;
 import tech.pegasys.teku.test.acceptance.dsl.TekuBeaconNode;
 import tech.pegasys.teku.test.acceptance.dsl.TekuNodeConfigBuilder;
 import tech.pegasys.teku.test.acceptance.dsl.TekuValidatorNode;
@@ -39,8 +38,7 @@ public class MultiPeersStandAloneVcBlocksAcceptanceTest
       shouldShutDownWhenOwnedValidatorSlashed_StandAloneVC_MultiplePeers_SlashingThroughBlock_NoSlashingEventsGossip(
           final SlashingEventType slashingEventType) throws Exception {
 
-    final int genesisTime = timeProvider.getTimeInSeconds().plus(10).intValue();
-    final UInt64 altairEpoch = UInt64.valueOf(100);
+    final int genesisTime = timeProvider.getTimeInSeconds().plus(30).intValue();
 
     final TekuBeaconNode firstTekuNode =
         createTekuBeaconNode(
@@ -48,34 +46,17 @@ public class MultiPeersStandAloneVcBlocksAcceptanceTest
                 .withGenesisTime(genesisTime)
                 .withNetwork(network)
                 .withRealNetwork()
-                .withAltairEpoch(altairEpoch)
+                .withSubscribeAllSubnetsEnabled()
                 .withInteropValidators(0, 32)
                 .build());
 
-    firstTekuNode.start();
-
-    firstTekuNode.waitForEpochAtOrAbove(2);
-
-    final int slashedValidatorIndex = 34;
-    final BLSKeyPair slashedValidatorKeyPair = getBlsKeyPair(slashedValidatorIndex);
-    final int slotInThirdEpoch =
-        firstTekuNode.getSpec().forMilestone(SpecMilestone.ALTAIR).getSlotsPerEpoch() * 2 + 3;
-
-    postSlashing(
-        firstTekuNode,
-        UInt64.valueOf(slotInThirdEpoch),
-        UInt64.valueOf(slashedValidatorIndex),
-        slashedValidatorKeyPair.getSecretKey(),
-        slashingEventType);
-
     final TekuBeaconNode secondBeaconNode =
         createTekuBeaconNode(
             TekuNodeConfigBuilder.createBeaconNode()
                 .withGenesisTime(genesisTime)
                 .withNetwork(network)
                 .withRealNetwork()
-                .withRealNetwork()
-                .withAltairEpoch(altairEpoch)
+                .withSubscribeAllSubnetsEnabled()
                 .withPeers(firstTekuNode)
                 .build());
 
@@ -89,10 +70,23 @@ public class MultiPeersStandAloneVcBlocksAcceptanceTest
                 .withBeaconNodes(secondBeaconNode)
                 .build());
 
+    firstTekuNode.start();
     secondBeaconNode.start();
-
     secondValidatorClient.start();
 
+    firstTekuNode.waitForEpochAtOrAbove(1);
+
+    final int slashedValidatorIndex = 34;
+    final BLSKeyPair slashedValidatorKeyPair = getBlsKeyPair(slashedValidatorIndex);
+    final int slotInSecondEpoch = firstTekuNode.getSpec().getGenesisSpec().getSlotsPerEpoch() + 3;
+
+    postSlashing(
+        firstTekuNode,
+        UInt64.valueOf(slotInSecondEpoch),
+        UInt64.valueOf(slashedValidatorIndex),
+        slashedValidatorKeyPair.getSecretKey(),
+        slashingEventType);
+
     secondValidatorClient.waitForLogMessageContaining(
         String.format(slashingActionLog, slashedValidatorKeyPair.getPublicKey().toHexString()));
 
diff --git a/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/ValidatorSlashingDetectionAcceptanceTest.java b/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/ValidatorSlashingDetectionAcceptanceTest.java
index c177ddc9053..7259cdbd201 100644
--- a/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/ValidatorSlashingDetectionAcceptanceTest.java
+++ b/acceptance-tests/src/acceptance-test/java/tech/pegasys/teku/test/acceptance/validatorslashing/ValidatorSlashingDetectionAcceptanceTest.java
@@ -47,7 +47,7 @@ public class ValidatorSlashingDetectionAcceptanceTest extends AcceptanceTestBase
   final String slashingActionLog =
       "Validator slashing detection is enabled and validator(s) with public key(s) %s detected as slashed. "
           + "Shutting down...";
-  final int shutdownWaitingSeconds = 60;
+  final int shutdownWaitingSeconds = 90;
 
   enum SlashingEventType {
     PROPOSER_SLASHING,
diff --git a/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuBeaconNode.java b/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuBeaconNode.java
index cb0f1852276..40cc58845aa 100644
--- a/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuBeaconNode.java
+++ b/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuBeaconNode.java
@@ -226,6 +226,7 @@ public void postProposerSlashing(
         randomSignedBeaconBlockHeader(slot, index, secretKey, signingRootUtil, forkInfo);
     final SignedBeaconBlockHeader header2 =
         randomSignedBeaconBlockHeader(slot, index, secretKey, signingRootUtil, forkInfo);
+    LOG.debug("Inserting proposer slashing for index {} at slot {}", index, slot);
     final String body =
         JsonUtil.serialize(
             new ProposerSlashing(header1, header2),
@@ -256,6 +257,7 @@ public void postAttesterSlashing(
         spec.getGenesisSchemaDefinitions()
             .getAttesterSlashingSchema()
             .create(indexedAttestation1, indexedAttestation2);
+    LOG.debug("Inserting attester slashing for index {} at slot {}", slashedIndex, slashingSlot);
     final String body =
         JsonUtil.serialize(
             attesterSlashing,
diff --git a/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuNodeConfigBuilder.java b/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuNodeConfigBuilder.java
index b1947a653be..b931a600a78 100644
--- a/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuNodeConfigBuilder.java
+++ b/acceptance-tests/src/testFixtures/java/tech/pegasys/teku/test/acceptance/dsl/TekuNodeConfigBuilder.java
@@ -417,6 +417,12 @@ public TekuNodeConfigBuilder withDoppelgangerDetectionEnabled() {
     return this;
   }
 
+  public TekuNodeConfigBuilder withSubscribeAllSubnetsEnabled() {
+    LOG.debug("p2p-subscribe-all-subnets-enabled=true");
+    configMap.put("p2p-subscribe-all-subnets-enabled", true);
+    return this;
+  }
+
   public TekuNodeConfigBuilder withDepositsFrom(final BesuNode eth1Node) {
     mustBe(NodeType.BEACON_NODE);
     configMap.put("Xinterop-enabled", false);