From 679f0d295369deb99318841f8d2bd2922164c3a0 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Fri, 21 Aug 2026 06:29:29 +0000
Subject: [PATCH 1/2] feat: update bun runtime to v1.4.0

---
 .bun-version | 2 +-
 README.md    | 2 +-
 src/index.ts | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.bun-version b/.bun-version
index 085c0f2..88c5fb8 100644
--- a/.bun-version
+++ b/.bun-version
@@ -1 +1 @@
-1.3.14
+1.4.0
diff --git a/README.md b/README.md
index ad16fd0..3818c71 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ A custom [Bun](https://bun.sh) runtime for AWS Lambda with CDK constructs for ea
 > [!NOTE]
 > **v3 is ESM-only and no longer published as a jsii package.** Polyglot CDK support (Python, Java, .NET) has been removed — there were zero consumers. If you need the layer without CDK, the zip is available as a GitHub Release asset. See [ADR: Drop jsii](docs/adr-drop-jsii.md) for the full rationale.
 
-Current bun version: [1.3.14](https://bun.sh/blog/bun-v1.3.14)
+Current bun version: [1.4.0](https://bun.sh/blog/bun-v1.4.0)
 
 ## Installation
 
diff --git a/src/index.ts b/src/index.ts
index 62b9552..a1987ae 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -7,7 +7,7 @@ import type { LayerVersionProps } from "aws-cdk-lib/aws-lambda";
 import { LogGroup, RetentionDays } from "aws-cdk-lib/aws-logs";
 import type { Construct } from "constructs";
 
-const bunVersion = "1.3.14";
+const bunVersion = "1.4.0";
 
 export interface BunFunctionProps extends Omit<
   FunctionProps,

From 615463e915cca7b6cd0644396d3caac4607f2cdf Mon Sep 17 00:00:00 2001
From: Ivan Barlog <ivan.barlog@beesolve.com>
Date: Sat, 22 Aug 2026 11:34:47 +0200
Subject: [PATCH 2/2] fix: derive test version dynamically from src/index.ts

---
 test/buildLayer.test.ts | 12 ++++++------
 test/constructs.test.ts |  7 +++++--
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/test/buildLayer.test.ts b/test/buildLayer.test.ts
index 6de90da..fe4b644 100644
--- a/test/buildLayer.test.ts
+++ b/test/buildLayer.test.ts
@@ -1,4 +1,9 @@
 import { describe, expect, test } from "bun:test";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const srcIndex = readFileSync(resolve(__dirname, "../src/index.ts"), "utf8");
+const bunVersion = srcIndex.match(/const bunVersion = "([^"]+)"/)?.[1] ?? "";
 
 describe("version parameter precedence (Property 6)", () => {
   // Uses non-existent versions that pass validation but 404 at download (fast failure)
@@ -20,17 +25,12 @@ describe("version parameter precedence (Property 6)", () => {
   });
 
   test("falls back to src/index.ts version when both are absent", () => {
-    // The script resolves 1.3.14 from src/index.ts and starts downloading.
-    // We don't wait for the full download — just verify it found the right version.
-    // Use a fake non-downloadable version by temporarily patching would be complex,
-    // so instead we rely on the output showing the resolved version.
     const proc = Bun.spawnSync(["bun", "command/buildLayer.ts"], {
       env: { ...process.env, BUN_VERSION: undefined },
       timeout: 3000,
     });
     const output = proc.stdout.toString() + proc.stderr.toString();
-    // The script should print "Downloading Bun v1.3.14" proving it read src/index.ts
-    expect(output).toContain("1.3.14");
+    expect(output).toContain(bunVersion);
   });
 });
 
diff --git a/test/constructs.test.ts b/test/constructs.test.ts
index f09015c..fc707ce 100644
--- a/test/constructs.test.ts
+++ b/test/constructs.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test, beforeAll, afterAll } from "bun:test";
-import { existsSync, writeFileSync, unlinkSync } from "node:fs";
+import { existsSync, readFileSync, writeFileSync, unlinkSync } from "node:fs";
 import { resolve } from "node:path";
 
 import { App, Stack } from "aws-cdk-lib";
@@ -8,8 +8,11 @@ import * as fc from "fast-check";
 
 import { BunFunction, BunLambdaLayer } from "../src/index";
 
+const srcIndex = readFileSync(resolve(__dirname, "../src/index.ts"), "utf8");
+const bunVersion = srcIndex.match(/const bunVersion = "([^"]+)"/)?.[1] ?? "";
+
 // CDK's Code.fromAsset requires the zip to exist on disk during synth
-const dummyZipPath = resolve(__dirname, "../src/bun-lambda-layer-1.3.14.zip");
+const dummyZipPath = resolve(__dirname, `../src/bun-lambda-layer-${bunVersion}.zip`);
 
 beforeAll(() => {
   if (!existsSync(dummyZipPath)) {