diff --git a/bcutils.js b/bcutils.js
index dfaf559..9d39692 100644
--- a/bcutils.js
+++ b/bcutils.js
@@ -12,6 +12,7 @@ const BC_TRANSID_MAX_PARAMS_NUM = 3;
 const BC_TRANSID_MAX_SEQID = 9999999;
 const BC_TRANS_FUNC_ACTIVATE = 1;
 const BC_TRANS_FUNC_MINT_SHARD = 2;
+const BC_TRANS_FUNC_EVOLVE = 3;
 
 const BC_EPOCH = 1643212800;
 
@@ -132,6 +133,7 @@ exports.BC_MAX_TOKEN_IDX = BC_MAX_TOKEN_IDX;
 exports.BC_TRANSID_MAX_PARAMS_NUM = BC_TRANSID_MAX_PARAMS_NUM;
 exports.BC_TRANS_FUNC_ACTIVATE = BC_TRANS_FUNC_ACTIVATE;
 exports.BC_TRANS_FUNC_MINT_SHARD = BC_TRANS_FUNC_MINT_SHARD;
+exports.BC_TRANS_FUNC_EVOLVE = BC_TRANS_FUNC_EVOLVE;
 exports.NONE_TYPE = NONE_TYPE;
 exports.HERO_TYPE = HERO_TYPE;
 exports.EQUIP_TYPE = EQUIP_TYPE;