diff --git a/craco.config.js b/craco.config.js
index 4da4d1dc..05312466 100644
--- a/craco.config.js
+++ b/craco.config.js
@@ -111,7 +111,6 @@ SOFTWARE.`;
 
 const licenseTextOverrides = {
     '@pybricks/firmware': pybricksLicense,
-    '@pybricks/mpy-cross-v5': pybricksLicense,
     '@shopify/dates': shopifyLicense,
     '@shopify/decorators': shopifyLicense,
     '@shopify/function-enhancers': shopifyLicense,
diff --git a/package.json b/package.json
index aba96565..892bd861 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
         "@blueprintjs/core": "^3.36.0",
         "@craco/craco": "^6.0.0",
         "@pybricks/firmware": "4.4.0",
-        "@pybricks/mpy-cross-v5": "^1.2.0",
+        "@pybricks/mpy-cross-v5": "^2.0.0",
         "@shopify/react-i18n": "^5.2.0",
         "@testing-library/dom": "^7.29.2",
         "@testing-library/jest-dom": "^5.11.8",
diff --git a/src/actions/mpy.ts b/src/actions/mpy.ts
index 7f34be36..7663f295 100644
--- a/src/actions/mpy.ts
+++ b/src/actions/mpy.ts
@@ -32,10 +32,10 @@ export function didCompile(data: Uint8Array): MpyDidCompileAction {
 
 export type MpyDidFailToCompileAction = Action<MpyActionType.DidFailToCompile> & {
     /** Error output. */
-    readonly err: string;
+    readonly err: string[];
 };
 
-export function didFailToCompile(err: string): MpyDidFailToCompileAction {
+export function didFailToCompile(err: string[]): MpyDidFailToCompileAction {
     return { type: MpyActionType.DidFailToCompile, err };
 }
 
diff --git a/src/sagas/__snapshots__/mpy.test.ts.snap b/src/sagas/__snapshots__/mpy.test.ts.snap
new file mode 100644
index 00000000..1e4167cd
--- /dev/null
+++ b/src/sagas/__snapshots__/mpy.test.ts.snap
@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`compiler error works 1`] = `
+Array [
+  "Traceback (most recent call last):",
+  "  File \\"main.py\\", line 1",
+  "SyntaxError: invalid syntax",
+]
+`;
diff --git a/src/sagas/flash-firmware.ts b/src/sagas/flash-firmware.ts
index bb095420..f80d6c8d 100644
--- a/src/sagas/flash-firmware.ts
+++ b/src/sagas/flash-firmware.ts
@@ -146,7 +146,7 @@ function* loadFirmware(
     ])) as [MpyDidCompileAction, MpyDidFailToCompileAction];
 
     if (mpyFail) {
-        throw Error(mpyFail.err);
+        throw Error(mpyFail.err.join('\n'));
     }
 
     // compute offset for checksum - must be aligned to 4-byte boundary
diff --git a/src/sagas/mpy.test.ts b/src/sagas/mpy.test.ts
index b4d81493..141a0f62 100644
--- a/src/sagas/mpy.test.ts
+++ b/src/sagas/mpy.test.ts
@@ -37,7 +37,7 @@ test('compiler error works', async () => {
     const action = await saga.take();
     expect(action.type).toBe(MpyActionType.DidFailToCompile);
     const { err } = action as MpyDidFailToCompileAction;
-    expect(err).toContain('SyntaxError');
+    expect(err).toMatchSnapshot();
 
     await saga.end();
 });
diff --git a/src/sagas/notification.test.ts b/src/sagas/notification.test.ts
index 86212272..5ffd07f1 100644
--- a/src/sagas/notification.test.ts
+++ b/src/sagas/notification.test.ts
@@ -31,7 +31,7 @@ test.each([
     bootloaderDidFailToConnect(BootloaderConnectionFailureReason.NoWebBluetooth),
     bootloaderDidFailToConnect(BootloaderConnectionFailureReason.GattServiceNotFound),
     storageChanged('test'),
-    didFailToCompile('reason'),
+    didFailToCompile(['reason']),
     add('warning', 'message'),
     add('error', 'message', 'url'),
     didUpdate({} as ServiceWorkerRegistration),
diff --git a/src/sagas/notification.ts b/src/sagas/notification.ts
index 47ee3e5c..d386583b 100644
--- a/src/sagas/notification.ts
+++ b/src/sagas/notification.ts
@@ -220,7 +220,9 @@ function* dismissCompilerError(): Generator {
 }
 
 function* showCompilerError(action: MpyDidFailToCompileAction): Generator {
-    yield* showSingleton(Level.Error, MessageId.MpyError, { errorMessage: action.err });
+    yield* showSingleton(Level.Error, MessageId.MpyError, {
+        errorMessage: React.createElement('pre', undefined, action.err.join('\n')),
+    });
 }
 
 function* addNotification(action: NotificationAddAction): Generator {
diff --git a/yarn.lock b/yarn.lock
index 4018380f..c6a9ebcc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1462,10 +1462,10 @@
   dependencies:
     jszip "^3.5.0"
 
-"@pybricks/mpy-cross-v5@^1.2.0":
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/@pybricks/mpy-cross-v5/-/mpy-cross-v5-1.2.0.tgz#29cbd949c579c0551792d2fd1cd777d193aa925c"
-  integrity sha512-A1FXGP0teuZa3tPBTz9niCdEol4Ld6jOABl9FkglmutGWO99eLwuyYibh8wQqHNKwXRHrzCJmo/W+/42HmSjog==
+"@pybricks/mpy-cross-v5@^2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@pybricks/mpy-cross-v5/-/mpy-cross-v5-2.0.0.tgz#9d64e1dedda0a7a028117f510ce5365f504df400"
+  integrity sha512-s3B+0tsXRHF3Y+FfOeDkNLoM+dwwT8P05UowVYPQvTV/UjhBGwruUdEoG/cYz2cFrqx+VFF8gpgmpw+5aA7/hQ==
 
 "@redux-saga/core@^1.1.3":
   version "1.1.3"