diff --git a/.env.development b/.env.development
index 2207cb3..fbcce49 100644
--- a/.env.development
+++ b/.env.development
@@ -11,7 +11,7 @@ CHAIN_CONFIRM_NUM=6
 CHAIN_MASTER_KEY=0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d
 CHAIN_MINT_KEY=0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d
 CHAIN_ADMIN_KEY=0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d
-CHAIN_RPC_URL='http://192.168.100.22:8545'
+CHAIN_RPC_URL='ws://192.168.100.22:8545'
 CHAIN_FT_ADDRESS=0x9561C133DD8580860B6b7E504bC5Aa500f0f06a7
 CHAIN_NFT_ADDRESS=0x9b1f7F645351AF3631a656421eD2e40f2802E6c0
 CHAIN_FTLOCKER_ADDRESS=0x7a0D4dca33d97ae2bF8a661541CE83dF27c2a3e8