diff --git a/open-sse/providers/registry/codex.js b/open-sse/providers/registry/codex.js
index f01153db..15a38784 100644
--- a/open-sse/providers/registry/codex.js
+++ b/open-sse/providers/registry/codex.js
@@ -2,7 +2,7 @@ import { withCodexReviewModels } from "../models/helpers.js";
 
 // Codex CLI version seen by OpenAI's backend — single source for the Version /
 // User-Agent identity headers. Bump when the installed codex CLI is upgraded.
-const CODEX_CLI_VERSION = "0.155.0";
+const CODEX_CLI_VERSION = "0.159.0";
 const GPT_6_LITE_THINKING_LEVELS = ["low", "medium", "high", "xhigh", "max"];
 
 export default {
diff --git a/tests/unit/codex-gpt6-lite.test.js b/tests/unit/codex-gpt6-lite.test.js
index 25182652..77cb8ed7 100644
--- a/tests/unit/codex-gpt6-lite.test.js
+++ b/tests/unit/codex-gpt6-lite.test.js
@@ -190,7 +190,8 @@ describe("Codex GPT-6 Sol/Luna transport", () => {
     const body = JSON.parse(options.body);
     expect(url).toBe("https://chatgpt.com/backend-api/codex/responses");
     expect(options.headers["x-openai-internal-codex-responses-lite"]).toBe("true");
-    expect(options.headers.version).toBe("0.155.0");
+    expect(options.headers.version).toBe("0.159.0");
+    expect(options.headers["User-Agent"]).toBe("codex_cli_rs/0.159.0");
     expect(body.model).toBe("gpt-6-luna");
     expect(body.instructions).toBe("");
     expect(body.input[0].type).toBe("additional_tools");