diff --git a/eth2deposit/settings.py b/eth2deposit/settings.py
index 1842ece..b75e6aa 100644
--- a/eth2deposit/settings.py
+++ b/eth2deposit/settings.py
@@ -9,9 +9,18 @@ MainnetSetting = BaseChainSetting(
     GENESIS_FORK_VERSION=bytes.fromhex('00000000'),
 )
 
+
+# Eth2 spec v0.11.3 testnet
+WittiSetting = BaseChainSetting(
+    GENESIS_FORK_VERSION=bytes.fromhex('00000113'),
+)
+
+
 MAINNET = 'mainnet'
+WITTI = 'witti'
 ALL_CHAINS: Dict[str, BaseChainSetting] = {
     MAINNET: MainnetSetting,
+    WITTI: WittiSetting,
 }