diff --git a/network/testnet/mumbai/index.json b/network/testnet/mumbai/index.json
index 3c9e0bd..9999314 100644
--- a/network/testnet/mumbai/index.json
+++ b/network/testnet/mumbai/index.json
@@ -90,7 +90,7 @@
     "DaggerEndpoint": "wss://mumbai-dagger.matic.today",
     "Explorer": "https://mumbai.polygonscan.com",
     "NetworkAPI": "https://apis.matic.network/api/v1/mumbai",
-    "SupportsEIP1559": false,
+    "SupportsEIP1559": true,
     "Contracts": {
       "EIP1559Burn": "0x70bca57f4579f58670ab2d18ef16e02c17553c38",
       "ChildChain": "0x1EDd419627Ef40736ec4f8ceffdE671a30803c5e",