diff --git a/packages/sbtc/package.json b/packages/sbtc/package.json
index 0b7573232..d82f8a285 100644
--- a/packages/sbtc/package.json
+++ b/packages/sbtc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sbtc",
-  "version": "0.2.4",
+  "version": "0.2.5",
   "description": "Library for sBTC.",
   "license": "MIT",
   "author": "Hiro Systems PBC (https://hiro.so)",
diff --git a/packages/sbtc/src/api.ts b/packages/sbtc/src/api.ts
index c00227721..ffcd814e4 100644
--- a/packages/sbtc/src/api.ts
+++ b/packages/sbtc/src/api.ts
@@ -102,6 +102,7 @@ export class SbtcApiClient {
   async broadcastTx(tx: btc.Transaction): Promise<string> {
     return await fetch(`${this.config.btcApiUrl}/tx`, {
       method: 'POST',
+      headers: { 'Content-Type': 'text/plain' },
       body: tx.hex,
     }).then(res => res.json() as Promise<string>);
   }