diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index dc36b36b..fccae61f 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Fixed
 
+- Fixed Windows pnpm global install detection to recognize `\\.pnpm\\` store paths, so update notices now suggest `pnpm install -g @mariozechner/pi-coding-agent` instead of falling back to npm ([#3378](https://github.com/badlogic/pi-mono/issues/3378))
 - Fixed missing `@sinclair/typebox` runtime dependency in `@mariozechner/pi-coding-agent`, so strict pnpm installs no longer fail with `ERR_MODULE_NOT_FOUND` when starting `pi` ([#3434](https://github.com/badlogic/pi-mono/issues/3434))
 - Fixed xterm uppercase typing in the interactive editor by decoding printable `modifyOtherKeys` input and normalizing shifted letter matching, so `Shift+letter` no longer disappears in `pi` ([#3436](https://github.com/badlogic/pi-mono/issues/3436))
 - Fixed `/compact` to reuse the session thinking level for compaction summaries instead of forcing `high`, avoiding invalid reasoning-effort errors on `github-copilot/claude-opus-4.7` sessions configured for `medium` thinking ([#3438](https://github.com/badlogic/pi-mono/issues/3438))
diff --git a/packages/coding-agent/src/config.ts b/packages/coding-agent/src/config.ts
index cc663d76..eeb510b0 100644
--- a/packages/coding-agent/src/config.ts
+++ b/packages/coding-agent/src/config.ts
@@ -31,18 +31,18 @@ export function detectInstallMethod(): InstallMethod {
 		return "bun-binary";
 	}
 
-	const resolvedPath = `${__dirname}\0${process.execPath || ""}`.toLowerCase();
+	const resolvedPath = `${__dirname}\0${process.execPath || ""}`.toLowerCase().replace(/\\/g, "/");
 
-	if (resolvedPath.includes("/pnpm/") || resolvedPath.includes("/.pnpm/") || resolvedPath.includes("\\pnpm\\")) {
+	if (resolvedPath.includes("/pnpm/") || resolvedPath.includes("/.pnpm/")) {
 		return "pnpm";
 	}
-	if (resolvedPath.includes("/yarn/") || resolvedPath.includes("/.yarn/") || resolvedPath.includes("\\yarn\\")) {
+	if (resolvedPath.includes("/yarn/") || resolvedPath.includes("/.yarn/")) {
 		return "yarn";
 	}
 	if (isBunRuntime) {
 		return "bun";
 	}
-	if (resolvedPath.includes("/npm/") || resolvedPath.includes("/node_modules/") || resolvedPath.includes("\\npm\\")) {
+	if (resolvedPath.includes("/npm/") || resolvedPath.includes("/node_modules/")) {
 		return "npm";
 	}
 
diff --git a/packages/coding-agent/test/config.test.ts b/packages/coding-agent/test/config.test.ts
new file mode 100644
index 00000000..bfa04dfc
--- /dev/null
+++ b/packages/coding-agent/test/config.test.ts
@@ -0,0 +1,30 @@
+import { afterEach, describe, expect, test } from "vitest";
+import { detectInstallMethod, getUpdateInstruction } from "../src/config.js";
+
+const execPathDescriptor = Object.getOwnPropertyDescriptor(process, "execPath");
+
+function setExecPath(value: string): void {
+	Object.defineProperty(process, "execPath", {
+		value,
+		configurable: true,
+	});
+}
+
+afterEach(() => {
+	if (execPathDescriptor) {
+		Object.defineProperty(process, "execPath", execPathDescriptor);
+	}
+});
+
+describe("detectInstallMethod", () => {
+	test("detects pnpm from Windows .pnpm install paths", () => {
+		setExecPath(
+			"C:\\Users\\Admin\\Documents\\pnpm-repository\\global\\5\\.pnpm\\@mariozechner+pi-coding-agent@0.67.68\\node_modules\\@mariozechner\\pi-coding-agent\\dist\\cli.js",
+		);
+
+		expect(detectInstallMethod()).toBe("pnpm");
+		expect(getUpdateInstruction("@mariozechner/pi-coding-agent")).toBe(
+			"Run: pnpm install -g @mariozechner/pi-coding-agent",
+		);
+	});
+});