diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index e76228bf..bb1861ec 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Show `bun install` instead of `npm install` in update notification when running under Bun
 ### Added
 
 - Edit tool now uses fuzzy matching as fallback when exact match fails, tolerating trailing whitespace, smart quotes, Unicode dashes, and special spaces
diff --git a/packages/coding-agent/src/config.ts b/packages/coding-agent/src/config.ts
index b865350e..9d9af583 100644
--- a/packages/coding-agent/src/config.ts
+++ b/packages/coding-agent/src/config.ts
@@ -17,6 +17,9 @@ const __dirname = dirname(__filename);
 export const isBunBinary =
 	import.meta.url.includes("$bunfs") || import.meta.url.includes("~BUN") || import.meta.url.includes("%7EBUN");
 
+/** Detect if Bun is the runtime (compiled binary or bun run) */
+export const isBunRuntime = !!process.versions.bun;
+
 // =============================================================================
 // Package Asset Paths (shipped with executable)
 // =============================================================================
diff --git a/packages/coding-agent/src/modes/interactive/interactive-mode.ts b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
index 2469d9c0..79f536b0 100644
--- a/packages/coding-agent/src/modes/interactive/interactive-mode.ts
+++ b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
@@ -42,7 +42,7 @@ import {
 	visibleWidth,
 } from "@mariozechner/pi-tui";
 import { spawn, spawnSync } from "child_process";
-import { APP_NAME, getAuthPath, getDebugLogPath, isBunBinary, VERSION } from "../../config.js";
+import { APP_NAME, getAuthPath, getDebugLogPath, isBunBinary, isBunRuntime, VERSION } from "../../config.js";
 import type { AgentSession, AgentSessionEvent } from "../../core/agent-session.js";
 import type {
 	ExtensionContext,
@@ -2330,11 +2330,10 @@ export class InteractiveMode {
 	}
 
 	showNewVersionNotification(newVersion: string): void {
-		const updateInstruction = isBunBinary
-			? theme.fg("muted", `New version ${newVersion} is available. Download from: `) +
-				theme.fg("accent", "https://github.com/badlogic/pi-mono/releases/latest")
-			: theme.fg("muted", `New version ${newVersion} is available. Run: `) +
-				theme.fg("accent", "npm install -g @mariozechner/pi-coding-agent");
+		const action = isBunBinary
+			? `Download from: ${theme.fg("accent", "https://github.com/badlogic/pi-mono/releases/latest")}`
+			: `Run: ${theme.fg("accent", `${isBunRuntime ? "bun" : "npm"} install -g @mariozechner/pi-coding-agent`)}`;
+		const updateInstruction = theme.fg("muted", `New version ${newVersion} is available. `) + action;
 
 		this.chatContainer.addChild(new Spacer(1));
 		this.chatContainer.addChild(new DynamicBorder((text) => theme.fg("warning", text)));