diff --git a/.changeset/wicked-turkeys-vanish.md b/.changeset/wicked-turkeys-vanish.md
new file mode 100644
index 00000000..be3e0457
--- /dev/null
+++ b/.changeset/wicked-turkeys-vanish.md
@@ -0,0 +1,5 @@
+---
+'@genseki/react-query': patch
+---
+
+Change query key extraction spelling from `header` to `headers`
diff --git a/packages/react-query/src/index.ts b/packages/react-query/src/index.ts
index b0c1f621..381934b7 100644
--- a/packages/react-query/src/index.ts
+++ b/packages/react-query/src/index.ts
@@ -216,7 +216,7 @@ export function queryKey(method: string, path: string | number | symbol, payload
     return [method, path] as const
   }
 
-  const { header: _header, ...rest } = payload
+  const { headers: _headers, ...rest } = payload
   const normalizedPayload = normalizeObject(rest)
 
   if (normalizedPayload) {