diff --git a/README.md b/README.md
index 84ce03a4..7fc7c3ba 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ export EXECUTABLE="rollapp-evm"
 export ROLLAPP_CHAIN_ID="rollappevm_1234-1"
 export KEY_NAME_ROLLAPP="rol-user"
 export BASE_DENOM="arax"
-export BECH32="rol"
+export BECH32="ethm"
 export DENOM=$(echo "$BASE_DENOM" | sed 's/^.//')
 export MONIKER="$ROLLAPP_CHAIN_ID-sequencer"
 
diff --git a/scripts/update_genesis_file.sh b/scripts/update_genesis_file.sh
index 3a98d2ef..a2be6e93 100755
--- a/scripts/update_genesis_file.sh
+++ b/scripts/update_genesis_file.sh
@@ -81,3 +81,7 @@ jq --argjson elevated_address_json "$elevated_address_json" '.app_state.hubgenes
 denom_metadata=$(cat "$ROLLAPP_SETTLEMENT_INIT_DIR_PATH"/denommetadata.json)
 jq --argjson denom_metadata "$denom_metadata" '.app_state.bank.denom_metadata = $denom_metadata' "$GENESIS_FILE" >"$tmp" && mv "$tmp" "$GENESIS_FILE"
 jq --arg elevated_address "$elevated_address" '.app_state.denommetadata.params.allowed_addresses += [$elevated_address]' "$GENESIS_FILE" >"$tmp" && mv "$tmp" "$GENESIS_FILE"
+
+# ----------------------------- update evm params ---------------------------- #
+
+jq '.app_state.evm.params.extra_eips = [3855]' "$GENESIS_FILE" >"$tmp" && mv "$tmp" "$GENESIS_FILE"
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