diff --git a/uniswap/constants.py b/uniswap/constants.py
index 436634b..71ad4e7 100644
--- a/uniswap/constants.py
+++ b/uniswap/constants.py
@@ -31,6 +31,7 @@
     "görli": "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f",
     "xdai": "0xA818b4F111Ccac7AA31D0BCc0806d64F2E0737D7",
     "binance": "0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73",
+    "binance_testnet": "0x6725F303b657a9451d8BA641348b6761A6CC7a17",
 }
 
 _router_contract_addresses_v2 = {
@@ -40,4 +41,5 @@
     "görli": "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D",
     "xdai": "0x1C232F01118CB8B424793ae03F870aa7D0ac7f77",
     "binance": "0x10ED43C718714eb63d5aA57B78B54704E256024E",
+    "binance_testnet": "0xD99D1c33F9fC3444f8101754aBC46c52416550D1",
 }