diff --git a/.gitignore b/.gitignore
index 25d1823..eab4303 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ node_modules
 .DS_Store
 .pnpm-store
 npm-debug.log
+bun.lock
 
 # Coverage
 coverage/
diff --git a/bunfig.toml b/bunfig.toml
new file mode 100644
index 0000000..0c3983f
--- /dev/null
+++ b/bunfig.toml
@@ -0,0 +1,3 @@
+[test]
+root = "./tests"
+coverage = false
diff --git a/package.json b/package.json
index bb9029a..de6f464 100644
--- a/package.json
+++ b/package.json
@@ -34,17 +34,18 @@
     "@mariozechner/pi-ai": "^0.57.1",
     "@mariozechner/pi-coding-agent": "^0.57.1",
     "@mariozechner/pi-tui": "^0.57.1",
-    "@sinclair/typebox": "^0.34.48",
-    "@types/node": "^25.5.0",
-    "@typescript-eslint/eslint-plugin": "^8.38.0",
-    "@typescript-eslint/parser": "^8.38.0",
+    "@sinclair/typebox": "^0.34.49",
+    "@types/bun": "^1.3.14",
+    "@types/node": "^25.9.1",
+    "@typescript-eslint/eslint-plugin": "^8.59.4",
+    "@typescript-eslint/parser": "^8.59.4",
     "@vitest/coverage-v8": "^2.1.9",
-    "eslint": "^9.9.0",
-    "eslint-config-prettier": "^9.1.0",
-    "globals": "^17.4.0",
+    "eslint": "^9.39.4",
+    "eslint-config-prettier": "^9.1.2",
+    "globals": "^17.6.0",
     "markdownlint-cli": "^0.42.0",
-    "prettier": "^3.3.3",
-    "typescript": "^5.6.2",
-    "vitest": "^2.1.1"
+    "prettier": "^3.8.3",
+    "typescript": "^5.9.3",
+    "vitest": "^2.1.9"
   }
 }
diff --git a/tests/render.test.ts b/tests/render.test.ts
index 60cc904..94bf31a 100644
--- a/tests/render.test.ts
+++ b/tests/render.test.ts
@@ -7,11 +7,19 @@ import {
   setTaskListExpanded,
 } from "../.pi/extensions/workflow-orchestrator/render.js";
 
+// Portable frozen clock: works with both vitest and bun test runners.
+const FROZEN_NOW = new Date("2026-03-15T12:00:00.000Z").getTime();
+let originalDateNow: () => number;
+
 describe("render.ts", () => {
   let mockCtx: ExtensionContext;
   let mockUi: any;
 
   beforeEach(() => {
+    // Freeze Date.now() without relying on vitest fake timers
+    originalDateNow = Date.now;
+    Date.now = () => FROZEN_NOW;
+
     mockUi = {
       setStatus: vi.fn(),
       setWidget: vi.fn(),
@@ -30,16 +38,14 @@ describe("render.ts", () => {
         appendEntry: vi.fn(),
       },
     } as unknown as ExtensionContext;
-
-    vi.useFakeTimers();
-    vi.setSystemTime(new Date("2026-03-15T12:00:00.000Z"));
   });
 
   afterEach(() => {
-    vi.useRealTimers();
+    Date.now = originalDateNow;
     vi.clearAllMocks();
   });
 
+
   function createBaseState(overrides?: Partial<WorkflowState>): WorkflowState {
     return {
       runId: "test-run",
diff --git a/tsconfig.json b/tsconfig.json
index c217778..e8184e6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,7 +7,7 @@
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
-    "types": ["node"]
+    "types": ["node", "bun-types"]
   },
   "include": [".pi/extensions/**/*.ts", "tests/**/*.ts"]
 }