diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8ecf401a8..e0a6edb9f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 
 - [2285](https://github.com/umee-network/umee/pull/2285) Upgrade Cosmos SDK to v0.46.15.
+- [2288](https://github.com/umee-network/umee/pull/2288) Change `consensus.block.max_size` to 6MB.
 
 ### Bug Fixes
 
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index bdb265c0a7..fe874dd0ac 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -15,17 +15,24 @@ Highlights:
 - Add spot price fields to account summary, and ensure all other fields use leverage logic prices.
 - Fix avg params storage for x/oracle.
 - Emergency Groups are able to do security adjustments in x/metoken.
+- Reduced `consensus.block.max_size` to 4 MB.
 
 [CHANGELOG](CHANGELOG.md)
 
-### Emergency Groups
+### meTokens
 
-Currently, any parameter update requires going through a standard governance process, which takes 4 days. In a critical situation we need to act immediately:
+_meTokens_ is an abbreviation for Multi-Variant Elastic Tokens. We describe them as a general-purpose packaged asset builder. Simply put, they are tools to index multiple assets, which allows holders to build composable indexes that spread the risk associated with each asset bundled in an index.
 
-- Control IBC Quota parameters (eg disable IBC)
-- apply safe updates to oracle, leverage or incentive module parameters.
+MeTokens offer a way to build DeFi alternatives to TradFi and Web2 financial products. Think of a better, more liquid version of ETFs or mortgage-backed securities. The scope of buildable products will vary from builder to builder as the protocol allows for the creation of some of the most diverse use cases in the Cosmos Ecosystem.
 
-Emergency Group can trigger safe parameter updates at any time as a standard transaction. The Emergency Group address is controlled by the Umee Chain governance (`x/gov`) and can be disabled at any time.
+### Validators
+
+Following recent [asa-2023-002](https://forum.cosmos.network/t/amulet-security-advisory-for-cometbft-asa-2023-002/11604) security advisory we decreased the max block size to 4 MB.
+Based on Notional [analysis](https://github.com/notional-labs/placid#reduce-the-size-of-your-chains-mempool-in-bytes), mempool size should be adjusted as well. We recommend to set it to `15 * 4 MB` (15 x block size):
+
+```toml
+max_txs_bytes = 60000000
+```
 
 ### Upgrade instructions
 
diff --git a/app/upgrades.go b/app/upgrades.go
index 56475326ee..4b63e254dd 100644
--- a/app/upgrades.go
+++ b/app/upgrades.go
@@ -74,6 +74,15 @@ func (app *UmeeApp) registerUpgrade6_1(planName string, upgradeInfo upgradetypes
 			oracleUpgrader := oraclemigrator.NewMigrator(&app.OracleKeeper)
 			oracleUpgrader.ExgRatesWithTimestamp(ctx)
 
+			// reference: (today) avg block size in Ethereum is 170kb
+			// Cosmwasm binaries can be few hundreds KB up to 3MB
+			// our blocks with oracle txs as JSON are about 80kB, so protobuf should be less than 40kB.
+			var newMaxBytes int64 = 4_000_000 // 4 MB
+			p := app.GetConsensusParams(ctx)
+			ctx.Logger().Info("Changing consensus params", "prev", p.Block.MaxBytes, "new", newMaxBytes)
+			p.Block.MaxBytes = newMaxBytes
+			app.StoreConsensusParams(ctx, p)
+
 			return app.mm.RunMigrations(ctx, app.configurator, fromVM)
 		},
 	)