diff --git a/ccip/offchain/config/testnet.json b/ccip/offchain/config/testnet.json
index 8fc3f6be..6de039f8 100644
--- a/ccip/offchain/config/testnet.json
+++ b/ccip/offchain/config/testnet.json
@@ -318,5 +318,25 @@
       "version": "1.5.0"
     },
     "feeTokens": ["LINK", "WRON"]
+  },
+  "seiAtlantic": {
+    "chainSelector": "1216300075444106652",
+    "router": {
+      "address": "0x59F5222c5d77f8D3F56e34Ff7E75A05d2cF3a98A",
+      "version": "1.2.0"
+    },
+    "armproxy": {
+      "address": "0x754aBd2496Bea05ceDE80Df8bE530f6132208c41",
+      "version": "1.0.0"
+    },
+    "registrymodule": {
+      "address": "0x8538DE2a0Ba5C3db87B2Dc3d391Cc0Dd147dd827",
+      "version": "1.5.0"
+    },
+    "tokenadminregistry": {
+      "address": "0xDF27EE0050C2D3831089B14aCC465aBF9fD12C64",
+      "version": "1.5.0"
+    },
+    "feetokens": ["LINK", "WSEI"]
   }
 }