diff --git a/packages/linejs/base/e2ee/mod.ts b/packages/linejs/base/e2ee/mod.ts
index 0a86f76..e966ac5 100644
--- a/packages/linejs/base/e2ee/mod.ts
+++ b/packages/linejs/base/e2ee/mod.ts
@@ -1034,21 +1034,26 @@ export class E2EE {
 		nonce: Buffer,
 		data: Buffer,
 	): Promise<Buffer> {
+		// Convert ArrayBufferLike to ArrayBuffer
+		const nonceArrayBuffer = nonce.buffer.slice(nonce.byteOffset, nonce.byteOffset + nonce.byteLength);
+		const aesKeyArrayBuffer = aesKey.buffer.slice(aesKey.byteOffset, aesKey.byteOffset + aesKey.byteLength);
+		const dataArrayBuffer = data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength);
+		
 		return Buffer.from(
 			await globalThis.crypto.subtle.encrypt(
 				{
 					name: "AES-CTR",
-					counter: nonce,
+					counter: new Uint8Array(nonceArrayBuffer as ArrayBuffer),
 					length: 64,
 				},
 				await globalThis.crypto.subtle.importKey(
 					"raw",
-					aesKey,
+					new Uint8Array(aesKeyArrayBuffer as ArrayBuffer),
 					"AES-CTR",
 					false,
 					["encrypt", "decrypt"],
 				),
-				data,
+				new Uint8Array(dataArrayBuffer as ArrayBuffer),
 			),
 		);
 	}
diff --git a/packages/linejs/base/obs/mod.ts b/packages/linejs/base/obs/mod.ts
index 708e716..8b3d14a 100644
--- a/packages/linejs/base/obs/mod.ts
+++ b/packages/linejs/base/obs/mod.ts
@@ -185,7 +185,7 @@ export class LineObs {
 			...oid ? { oid: oid } : {
 				oid: "reqseq",
 				tomid: to,
-				reqseq: this.client.getReqseq("talk").toString(),
+				reqseq: (await this.client.getReqseq("talk")).toString(),
 			},
 		};
 		if (type === "image") {
@@ -202,7 +202,7 @@ export class LineObs {
 		return await this.uploadObjectForService({
 			data,
 			oType: type,
-			obsPath: toType + "/m/" + oid || "reqseq",
+			obsPath: `${toType}/m/${oid ?? "reqseq"}`,
 			filename: param.name,
 			params: param,
 		});
@@ -241,13 +241,13 @@ export class LineObs {
 		};
 
 		params = { ...baseParams, ...(params || {}) };
-
+		
 		if (!data || data.size === 0) {
 			throw new InternalError("ObsError", "No data to send.");
 		}
 		let headers: Record<string, string> = this.client.request
 			.getHeader("POST");
-		headers["Content-Type"] = "application/octet-stream";
+		headers["content-type"] = "application/octet-stream";
 		headers["X-Obs-Params"] = Buffer.from(JSON.stringify(params)).toString(
 			"base64",
 		);
@@ -331,7 +331,8 @@ export class LineObs {
 				Buffer.from(await data.arrayBuffer()),
 			);
 		const tempId = "reqid-" + crypto.randomUUID();
-		const edata = new Blob([encryptedData]);
+		const encryptedArrayBuffer = encryptedData.buffer.slice(encryptedData.byteOffset, encryptedData.byteOffset + encryptedData.byteLength);
+		const edata = new Blob([new Uint8Array(encryptedArrayBuffer as ArrayBuffer)]);
 		const { objId } = await this.uploadObjectForService({
 			data: edata,
 			oType: "file",
@@ -407,11 +408,13 @@ export class LineObs {
 			obsPath: "talk/" + contentMetadata.SID,
 			addHeaders: { "X-Talk-Meta": talkMeta },
 		});
+		const decryptedBuffer = await this.client.e2ee.decryptByKeyMaterial(
+			Buffer.from(await data.arrayBuffer()),
+			keyMaterial,
+		);
+		const decryptedArrayBuffer = decryptedBuffer.buffer.slice(decryptedBuffer.byteOffset, decryptedBuffer.byteOffset + decryptedBuffer.byteLength);
 		const fileData = new File([
-			await this.client.e2ee.decryptByKeyMaterial(
-				Buffer.from(await data.arrayBuffer()),
-				keyMaterial,
-			),
+			new Uint8Array(decryptedArrayBuffer as ArrayBuffer),
 		], fileName);
 		return fileData;
 	}
diff --git a/packages/linejs/base/request/mod.ts b/packages/linejs/base/request/mod.ts
index 0a28767..ee7a5da 100644
--- a/packages/linejs/base/request/mod.ts
+++ b/packages/linejs/base/request/mod.ts
@@ -140,13 +140,14 @@ export class RequestClient {
 			body: Trequest,
 		});
 
+		const requestArrayBuffer = Trequest.buffer.slice(Trequest.byteOffset, Trequest.byteOffset + Trequest.byteLength);
 		const response = await this.client.fetch(
 			`https://${this.endpoint}${path}`,
 			{
 				method: overrideMethod,
 				headers,
 				signal: AbortSignal.timeout(timeout),
-				body: Trequest,
+				body: new Uint8Array(requestArrayBuffer as ArrayBuffer),
 			},
 		);
 		const nextToken = response.headers.get("x-line-next-access");