diff --git a/.changeset/sad-cloths-obey.md b/.changeset/sad-cloths-obey.md
new file mode 100644
index 00000000000..602616a37da
--- /dev/null
+++ b/.changeset/sad-cloths-obey.md
@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+add zephyr testnet to pre-1559 chains
diff --git a/packages/thirdweb/src/gas/fee-data.ts b/packages/thirdweb/src/gas/fee-data.ts
index fa721426d9b..bd4aa003d8e 100644
--- a/packages/thirdweb/src/gas/fee-data.ts
+++ b/packages/thirdweb/src/gas/fee-data.ts
@@ -47,6 +47,7 @@ const FORCE_GAS_PRICE_CHAIN_IDS = [
   2020, // Ronin Mainnet
   2021, // Ronin Testnet (Saigon)
   98866, // Plume mainnet
+  1417429182, // Wilderworld Zephyr Testnet
 ];
 
 /**