diff --git a/.changelog/5591.trivial.md b/.changelog/5591.trivial.md
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/go/oasis-node/cmd/genesis/genesis.go b/go/oasis-node/cmd/genesis/genesis.go
index cf6ba4846a5..4ebaa8c6db2 100644
--- a/go/oasis-node/cmd/genesis/genesis.go
+++ b/go/oasis-node/cmd/genesis/genesis.go
@@ -853,8 +853,8 @@ func init() {
 	initGenesisFlags.Duration(CfgConsensusTimeoutCommit, 1*time.Second, "cometbft commit timeout")
 	initGenesisFlags.Bool(cfgConsensusSkipTimeoutCommit, false, "skip cometbft commit timeout")
 	initGenesisFlags.Duration(cfgConsensusEmptyBlockInterval, 0*time.Second, "cometbft empty block interval")
-	initGenesisFlags.String(cfgConsensusMaxTxSizeBytes, "32kb", "cometbft maximum transaction size (in bytes)")
-	initGenesisFlags.String(cfgConsensusMaxBlockSizeBytes, "21mb", "cometbft maximum block size (in bytes)")
+	initGenesisFlags.String(cfgConsensusMaxTxSizeBytes, "128kb", "cometbft maximum transaction size (in bytes)")
+	initGenesisFlags.String(cfgConsensusMaxBlockSizeBytes, "4mb", "cometbft maximum block size (in bytes)")
 	initGenesisFlags.Uint64(cfgConsensusMaxBlockGas, 0, "cometbft max gas used per block")
 	initGenesisFlags.String(cfgConsensusMaxEvidenceSizeBytes, "1mb", "cometbft max evidence size (in bytes)")
 	initGenesisFlags.Uint64(CfgConsensusStateCheckpointInterval, 10000, "consensus state checkpoint interval (in blocks)")