diff --git a/apps/dokploy/__test__/utils/spawnAsync.test.ts b/apps/dokploy/__test__/utils/spawnAsync.test.ts
new file mode 100644
index 000000000..3919d136d
--- /dev/null
+++ b/apps/dokploy/__test__/utils/spawnAsync.test.ts
@@ -0,0 +1,132 @@
+import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { spawnAsync } from "@dokploy/server/utils/process/spawnAsync";
+import { afterAll, describe, expect, it } from "vitest";
+
+const NODE = process.execPath;
+const dirs: string[] = [];
+
+const writeScript = (name: string, body: string) => {
+	const dir = mkdtempSync(path.join(tmpdir(), "spawnasync-utf8-"));
+	dirs.push(dir);
+	const file = path.join(dir, `${name}.mjs`);
+	writeFileSync(file, body, "utf8");
+	return file;
+};
+
+afterAll(() => {
+	for (const dir of dirs) {
+		rmSync(dir, { recursive: true, force: true });
+	}
+});
+
+const REPLACEMENT = "\uFFFD";
+const hasReplacement = (s: string) => s.includes(REPLACEMENT);
+
+describe("spawnAsync streaming UTF-8 decoding", () => {
+	it("decodes a multi-byte sequence split across two data events", async () => {
+		const file = writeScript(
+			"split",
+			`process.stdout.write(Buffer.from([0xe2]));
+			setTimeout(() => process.stdout.write(Buffer.from([0x94, 0x80])), 50);`,
+		);
+		let streamed = "";
+		const chunkByteSizes: number[] = [];
+		const result = spawnAsync(NODE, [file], (d) => {
+			streamed += d;
+		});
+		result.child.stdout?.on("data", (b: Buffer) => {
+			chunkByteSizes.push(b.length);
+		});
+		const captured = await result;
+		expect(chunkByteSizes.length).toBeGreaterThanOrEqual(2);
+		expect(chunkByteSizes[0]).toBe(1);
+		expect(streamed).toBe("\u2500");
+		expect(hasReplacement(streamed)).toBe(false);
+		expect(captured.toString("utf8")).toBe("\u2500");
+	});
+
+	it("preserves a multi-byte sequence aligned to the 64 KiB chunk boundary", async () => {
+		const file = writeScript(
+			"boundary",
+			`const f = Buffer.alloc(65535, 0x78);
+			const e = Buffer.from("\\u20AC\\n", "utf8");
+			process.stdout.write(Buffer.concat([f, e]));`,
+		);
+		let streamed = "";
+		const chunkByteSizes: number[] = [];
+		const result = spawnAsync(NODE, [file], (d) => {
+			streamed += d;
+		});
+		result.child.stdout?.on("data", (b: Buffer) => {
+			chunkByteSizes.push(b.length);
+		});
+		const captured = await result;
+		const expected = `${"x".repeat(65535)}\u20AC\n`;
+		expect(streamed).toBe(expected);
+		expect(hasReplacement(streamed)).toBe(false);
+		expect(captured.toString("utf8")).toBe(expected);
+		expect(streamed).toBe(captured.toString("utf8"));
+		expect(chunkByteSizes.length).toBeGreaterThanOrEqual(2);
+	});
+
+	it("decodes a multi-byte sequence split across two stderr data events", async () => {
+		const file = writeScript(
+			"stderr-split",
+			`process.stderr.write(Buffer.from([0xe2]));
+			setTimeout(() => process.stderr.write(Buffer.from([0x94, 0x80])), 50);`,
+		);
+		let streamed = "";
+		const stderrChunks: Buffer[] = [];
+		const result = spawnAsync(NODE, [file], (d) => {
+			streamed += d;
+		});
+		result.child.stderr?.on("data", (b: Buffer) => {
+			stderrChunks.push(b);
+		});
+		const captured = await result;
+		const stderrStr = Buffer.concat(stderrChunks).toString("utf8");
+		expect(stderrStr).toBe("\u2500");
+		expect(streamed).toBe("\u2500");
+		expect(hasReplacement(streamed)).toBe(false);
+		expect(captured.toString("utf8")).toBe("");
+	});
+
+	it("flushes a split trailing incomplete multi-byte sequence via decoder.end()", async () => {
+		const file = writeScript(
+			"incomplete",
+			`process.stdout.write(Buffer.from([0xe2]));
+			setTimeout(() => process.stdout.write(Buffer.from([0x82])), 50);`,
+		);
+		let streamed = "";
+		const result = spawnAsync(NODE, [file], (d) => {
+			streamed += d;
+		});
+		const captured = await result;
+		expect(streamed).toBe(REPLACEMENT);
+		expect(captured.toString("utf8")).toBe(REPLACEMENT);
+		expect(streamed).toBe(captured.toString("utf8"));
+	});
+
+	it("still rejects on non-zero exit with correctly decoded captured stderr", async () => {
+		const file = writeScript(
+			"fail",
+			`process.stdout.write("partial stdout \\u20AC\\n", () => {
+				process.stderr.write("err \\u20AC line\\n", () => process.exit(2));
+			});`,
+		);
+		let streamed = "";
+		const result = spawnAsync(NODE, [file], (d) => {
+			streamed += d;
+		});
+		const error = (await result.catch((e: unknown) => e)) as Error & {
+			code: number;
+		};
+		expect(error).toBeInstanceOf(Error);
+		expect(error.code).toBe(2);
+		expect(error.message).toBe("err \u20AC line\n");
+		expect(streamed).toBe("partial stdout \u20AC\nerr \u20AC line\n");
+		expect(hasReplacement(streamed)).toBe(false);
+	});
+});
diff --git a/packages/server/src/utils/process/spawnAsync.ts b/packages/server/src/utils/process/spawnAsync.ts
index 84855ec0f..4e439b3a2 100644
--- a/packages/server/src/utils/process/spawnAsync.ts
+++ b/packages/server/src/utils/process/spawnAsync.ts
@@ -3,6 +3,7 @@ import {
 	type SpawnOptions,
 	spawn,
 } from "node:child_process";
+import { StringDecoder } from "node:string_decoder";
 import BufferList from "bl";
 
 export const spawnAsync = (
@@ -15,11 +16,20 @@ export const spawnAsync = (
 	const stdout = child.stdout ? new BufferList() : new BufferList();
 	const stderr = child.stderr ? new BufferList() : new BufferList();
 
+	const stdoutDecoder = new StringDecoder("utf8");
+	const stderrDecoder = new StringDecoder("utf8");
+
 	if (child.stdout) {
 		child.stdout.on("data", (data) => {
 			stdout.append(data);
 			if (onData) {
-				onData(data.toString());
+				onData(stdoutDecoder.write(data));
+			}
+		});
+		child.stdout.on("end", () => {
+			const tail = stdoutDecoder.end();
+			if (onData && tail.length) {
+				onData(tail);
 			}
 		});
 	}
@@ -27,7 +37,13 @@ export const spawnAsync = (
 		child.stderr.on("data", (data) => {
 			stderr.append(data);
 			if (onData) {
-				onData(data.toString());
+				onData(stderrDecoder.write(data));
+			}
+		});
+		child.stderr.on("end", () => {
+			const tail = stderrDecoder.end();
+			if (onData && tail.length) {
+				onData(tail);
 			}
 		});
 	}