diff --git a/src/proxy.ts b/src/proxy.ts
index 4b09c31..8595cb8 100644
--- a/src/proxy.ts
+++ b/src/proxy.ts
@@ -6,6 +6,7 @@ import { saveApiKey, promptForApiKey, readAuthKey, deleteAuth } from "@/auth.js"
 import { setupOpenCodeConfig } from "@/setup/opencode.js";
 import { setupClaudeCodeConfig } from "@/setup/claude-code.js";
 import { logger, initLogger } from "@/logger.js";
+import { getProxyVersion } from "@/version.js";
 
 const args = process.argv.slice(2);
 
@@ -74,7 +75,7 @@ if (!config.apiKey) {
 const server = createServer(config);
 
 server.listen(config.port, config.host, () => {
-  console.log(`\n  Command Code API Proxy v${process.env.npm_package_version ?? "0.1.0"}`);
+  console.log(`\n  Command Code API Proxy v${getProxyVersion()}`);
   console.log(`  ${"=".repeat(50)}`);
   console.log(`  Listening on  http://${config.host}:${config.port}`);
   console.log(`  Auth: ${config.apiKey ? "ENABLED (Bearer token or x-api-key)" : "DISABLED"}`);
diff --git a/src/server.ts b/src/server.ts
index 334a2ab..9ce31de 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -13,6 +13,7 @@ import type { CCEvent } from "@/translate/types.js";
 import { formatSSE, formatSSEDone, formatAnthropicSSE } from "@/stream.js";
 import { sendToCC, collectEvents, UpstreamError } from "@/upstream.js";
 import { logger } from "@/logger.js";
+import { getProxyVersion } from "@/version.js";
 import {
   validateOpenAIChatRequest,
   validateAnthropicRequest,
@@ -242,7 +243,7 @@ async function pumpStream(
 function handleHealth(_req: http.IncomingMessage, res: http.ServerResponse): void {
   sendJson(res, 200, {
     status: "ok",
-    version: process.env.npm_package_version ?? "0.1.0",
+    version: getProxyVersion(),
   });
 }
 
@@ -353,10 +354,7 @@ async function handleChatCompletions(
         stream,
         res,
         (event) => encoder.emit(event).map((c) => formatSSE(c)),
-        () =>
-          encoder.finished
-            ? []
-            : encoder.finishChunks("stop").map((c) => formatSSE(c)),
+        () => (encoder.finished ? [] : encoder.finishChunks("stop").map((c) => formatSSE(c))),
         // Stream-level error (TCP failure, idle timeout, encoder throw).
         // Always emit a uniform content+finish chunk pair via streamErrorChunks
         // — mixing a non-chunk `{error:...}` envelope with valid chunks
@@ -455,9 +453,7 @@ async function handleMessages(req: http.IncomingMessage, res: http.ServerRespons
         () =>
           encoder.finished
             ? []
-            : encoder
-                .finishRecords("end_turn")
-                .map((r) => formatAnthropicSSE(r.event, r.data)),
+            : encoder.finishRecords("end_turn").map((r) => formatAnthropicSSE(r.event, r.data)),
         (err) => {
           const records: AnthropicSSERecord[] = [
             {
diff --git a/src/version.ts b/src/version.ts
new file mode 100644
index 0000000..67323d1
--- /dev/null
+++ b/src/version.ts
@@ -0,0 +1,20 @@
+import { readFileSync } from "node:fs";
+
+let cached: string | undefined;
+
+export function getProxyVersion(): string {
+  if (cached) return cached;
+  cached = readPackageJsonVersion() ?? process.env.npm_package_version ?? "0.0.0";
+  return cached;
+}
+
+function readPackageJsonVersion(): string | undefined {
+  try {
+    const pkg = JSON.parse(readFileSync(new URL("../package.json", import.meta.url), "utf8")) as {
+      version?: string;
+    };
+    return typeof pkg.version === "string" && pkg.version.length > 0 ? pkg.version : undefined;
+  } catch {
+    return undefined;
+  }
+}
diff --git a/tests/server.test.ts b/tests/server.test.ts
index d2f1991..f8128b0 100644
--- a/tests/server.test.ts
+++ b/tests/server.test.ts
@@ -1,8 +1,13 @@
 import { describe, it, expect, beforeAll, afterAll } from "vitest";
 import http from "node:http";
+import { readFileSync } from "node:fs";
 import { loadConfig } from "@/config.js";
 import { createServer } from "@/server.js";
 
+const pkg = JSON.parse(readFileSync(new URL("../package.json", import.meta.url), "utf8")) as {
+  version: string;
+};
+
 describe("Server", () => {
   let server: http.Server;
   const port = 18987;
@@ -32,11 +37,12 @@ describe("Server", () => {
     expect(body.error).toBe("Not found");
   });
 
-  it("returns health status", async () => {
+  it("returns health status with the real package version", async () => {
     const res = await fetch(`${baseUrl}/health`);
     expect(res.status).toBe(200);
     const body = (await res.json()) as any;
     expect(body.status).toBe("ok");
+    expect(body.version).toBe(pkg.version);
   });
 
   it("returns model list", async () => {
diff --git a/tests/version.test.ts b/tests/version.test.ts
new file mode 100644
index 0000000..ef3bae0
--- /dev/null
+++ b/tests/version.test.ts
@@ -0,0 +1,21 @@
+import { describe, it, expect, beforeAll } from "vitest";
+import { readFileSync } from "node:fs";
+import { getProxyVersion } from "@/version.js";
+
+const pkg = JSON.parse(readFileSync(new URL("../package.json", import.meta.url), "utf8")) as {
+  version: string;
+};
+
+describe("getProxyVersion", () => {
+  beforeAll(() => {
+    delete process.env.npm_package_version;
+  });
+
+  it("resolves the version from package.json without npm env vars", () => {
+    expect(getProxyVersion()).toBe(pkg.version);
+  });
+
+  it("does not fall back to the stale 0.1.0 default", () => {
+    expect(getProxyVersion()).not.toBe("0.1.0");
+  });
+});