diff --git a/CHANGELOG.md b/CHANGELOG.md
index 946cbbcc255..b9961b039fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,8 @@
 - chore: generate v0 JSON RPC specification ([filecoin-project/lotus#13155](https://github.com/filecoin-project/lotus/pull/13155))
 - deps(f3): bump go-f3 version to 0.8.6, move power table cache to go-f3 from lotus ([filecoin-project/lotus#13144](https://github.com/filecoin-project/lotus/pull/13144))
 - feat(f3): move go-f3 datastore to separate leveldb instance ([filecoin-project/lotus#13174](https://github.com/filecoin-project/lotus/pull/13174))
+- chore: bump the pubsub validation queue length to 256 ([filecoin-project/lotus#13176](https://github.com/filecoin-project/lotus/pull/13176))
+
 
 # Node v1.33.0 / 2025-05-08
 The Lotus v1.33.0 release introduces experimental v2 APIs with F3 awareness, featuring a new TipSet selection mechanism that significantly enhances how applications interact with the Filecoin blockchain. This release candidate also adds F3-aware Ethereum APIs via the /v2 endpoint.  All of the /v2 APIs implement intelligent fallback mechanisms between F3 and Expected Consensus and are exposed through the Lotus Gateway.
diff --git a/node/modules/lp2p/pubsub.go b/node/modules/lp2p/pubsub.go
index 82ce7c9ad2a..0add2b0d9c4 100644
--- a/node/modules/lp2p/pubsub.go
+++ b/node/modules/lp2p/pubsub.go
@@ -252,6 +252,15 @@ func GossipSub(in GossipIn) (service *pubsub.PubSub, err error) {
 		// Gossipsubv1.1 configuration
 		pubsub.WithFloodPublish(true),
 		pubsub.WithMessageIdFn(HashMsgId),
+		// Bump the validation queue to accommodate the increase in gossipsub message
+		// exchange rate as a result of f3. The size of 256 should offer enough headroom
+		// for slower F3 validation while avoiding: 1) avoid excessive memory usage, 2)
+		// dropped consensus related messages and 3) cascading effect among other topics
+		// since this config isn't topic-specific.
+		//
+		// Note that the worst case memory footprint is 256 MiB based on the default
+		// message size of 1 MiB, which isn't overridden in Lotus.
+		pubsub.WithValidateQueueSize(256),
 		pubsub.WithPeerScore(
 			&pubsub.PeerScoreParams{
 				AppSpecificScore: func(p peer.ID) float64 {