From a1c65064bb407f3e1c46ed0b147efe32aaf379f2 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 01:02:52 +0530
Subject: [PATCH 01/20] Retry Xeus 4.3.4

---
 lite/requirements.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lite/requirements.txt b/lite/requirements.txt
index 8a4fda79..d481df07 100644
--- a/lite/requirements.txt
+++ b/lite/requirements.txt
@@ -1,3 +1,3 @@
 jupyterlite==0.7.0
 jupyterlite-pyodide-kernel==0.7
-jupyterlite-xeus==4.2.0
+jupyterlite-xeus==4.3.4

From f9902e7fc8154b33e084e84a96c2b148e8efcffb Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 02:01:05 +0530
Subject: [PATCH 02/20] Try removing insert-cell-below call to address crash

---
 ui-tests/tests/jupytereverywhere.spec.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 195ea69f..92d549c9 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1049,7 +1049,6 @@ test('Should switch to R kernel and run R code', async ({ page }) => {
 
   await runCommand(page, 'jupytereverywhere:switch-kernel', { kernel: 'xr' });
   await page.waitForTimeout(10000);
-  await runCommand(page, 'notebook:insert-cell-below');
 
   const code = 'lm(mpg ~ wt + hp + disp + cyl, data=mtcars)';
   const cell = page.locator('.jp-Cell').last();

From 4dd338150d24ce4a7b1f7c0c75b505ecf3fcc8c7 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 02:06:22 +0530
Subject: [PATCH 03/20] Select first cell instead of last

---
 ui-tests/tests/jupytereverywhere.spec.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 92d549c9..92b11f0e 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1051,7 +1051,7 @@ test('Should switch to R kernel and run R code', async ({ page }) => {
   await page.waitForTimeout(10000);
 
   const code = 'lm(mpg ~ wt + hp + disp + cyl, data=mtcars)';
-  const cell = page.locator('.jp-Cell').last();
+  const cell = page.locator('.jp-Cell').first();
   await cell.getByRole('textbox').fill(code);
 
   await runCommand(page, 'notebook:run-cell');
@@ -1077,7 +1077,7 @@ test.describe('Kernel networking', () => {
     await page.waitForSelector('.jp-NotebookPanel');
 
     const code = `read.csv("${remoteUrl}")`;
-    const cell = page.locator('.jp-Cell').last();
+    const cell = page.locator('.jp-Cell').first();
     await cell.getByRole('textbox').fill(code);
 
     await runCommand(page, 'notebook:run-cell');

From 19253876125c5130aa09df4c9231f6227cde6130 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 02:22:23 +0530
Subject: [PATCH 04/20] Run code with cell button instead of command

---
 ui-tests/tests/jupytereverywhere.spec.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 92b11f0e..02310bba 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1054,7 +1054,8 @@ test('Should switch to R kernel and run R code', async ({ page }) => {
   const cell = page.locator('.jp-Cell').first();
   await cell.getByRole('textbox').fill(code);
 
-  await runCommand(page, 'notebook:run-cell');
+  const runBtn = cell.locator('.je-cell-run-button');
+  await runBtn.click();
 
   const output = cell.locator('.jp-Cell-outputArea');
   await expect(output).toBeVisible({
@@ -1080,7 +1081,8 @@ test.describe('Kernel networking', () => {
     const cell = page.locator('.jp-Cell').first();
     await cell.getByRole('textbox').fill(code);
 
-    await runCommand(page, 'notebook:run-cell');
+    const runBtn = cell.locator('.je-cell-run-button');
+    await runBtn.click();
 
     const output = cell.locator('.jp-Cell-outputArea');
     await expect(output).toBeVisible({

From 668d2f72ee6edcc5a78a3d4a795789d0411eb4e5 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 02:41:55 +0530
Subject: [PATCH 05/20] What if we skip the test that crashes?

---
 ui-tests/tests/jupytereverywhere.spec.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 02310bba..db7fb4cd 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1043,7 +1043,7 @@ test.describe('Kernel Switching', () => {
   });
 });
 
-test('Should switch to R kernel and run R code', async ({ page }) => {
+test.skip('Should switch to R kernel and run R code', async ({ page }) => {
   await page.goto('lab/index.html');
   await page.waitForSelector('.jp-NotebookPanel');
 

From d547c1ff246a025cb32db3148d71340f9f0480e2 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 03:25:14 +0530
Subject: [PATCH 06/20] Try to run tests outside Python's `http.server`

---
 ui-tests/package.json | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ui-tests/package.json b/ui-tests/package.json
index 467d7f38..f5dc5399 100644
--- a/ui-tests/package.json
+++ b/ui-tests/package.json
@@ -4,12 +4,13 @@
   "description": "Jupyter Everywhere Integration Tests",
   "private": true,
   "scripts": {
-    "start": "cd ../dist && python -m http.server -b 127.0.0.1 3000",
+    "start": "npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ../dist",
     "test": "jlpm playwright test",
     "test:update": "jlpm playwright test --update-snapshots"
   },
   "devDependencies": {
     "@jupyterlab/application": "^4.5.0-beta.1",
-    "@playwright/test": "^1.57.0"
+    "@playwright/test": "^1.57.0",
+    "static-handler": "^0.4.1"
   }
 }

From 2ad6306189c34c9a3a76c34cb6cd9ad29ed8dbc5 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 03:26:14 +0530
Subject: [PATCH 07/20] Revert "What if we skip the test that crashes?"

This reverts commit 668d2f72ee6edcc5a78a3d4a795789d0411eb4e5.
---
 ui-tests/tests/jupytereverywhere.spec.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index db7fb4cd..02310bba 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1043,7 +1043,7 @@ test.describe('Kernel Switching', () => {
   });
 });
 
-test.skip('Should switch to R kernel and run R code', async ({ page }) => {
+test('Should switch to R kernel and run R code', async ({ page }) => {
   await page.goto('lab/index.html');
   await page.waitForSelector('.jp-NotebookPanel');
 

From 731794020b0a5c20db2067bc9c07ff85fef2856a Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 03:26:17 +0530
Subject: [PATCH 08/20] Revert "Run code with cell button instead of command"

This reverts commit 19253876125c5130aa09df4c9231f6227cde6130.
---
 ui-tests/tests/jupytereverywhere.spec.ts | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 02310bba..92b11f0e 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1054,8 +1054,7 @@ test('Should switch to R kernel and run R code', async ({ page }) => {
   const cell = page.locator('.jp-Cell').first();
   await cell.getByRole('textbox').fill(code);
 
-  const runBtn = cell.locator('.je-cell-run-button');
-  await runBtn.click();
+  await runCommand(page, 'notebook:run-cell');
 
   const output = cell.locator('.jp-Cell-outputArea');
   await expect(output).toBeVisible({
@@ -1081,8 +1080,7 @@ test.describe('Kernel networking', () => {
     const cell = page.locator('.jp-Cell').first();
     await cell.getByRole('textbox').fill(code);
 
-    const runBtn = cell.locator('.je-cell-run-button');
-    await runBtn.click();
+    await runCommand(page, 'notebook:run-cell');
 
     const output = cell.locator('.jp-Cell-outputArea');
     await expect(output).toBeVisible({

From eeceb95c78db6a9380f126ca3ff3cda40f1c151a Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 03:26:21 +0530
Subject: [PATCH 09/20] Revert "Select first cell instead of last"

This reverts commit 4dd338150d24ce4a7b1f7c0c75b505ecf3fcc8c7.
---
 ui-tests/tests/jupytereverywhere.spec.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 92b11f0e..92d549c9 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1051,7 +1051,7 @@ test('Should switch to R kernel and run R code', async ({ page }) => {
   await page.waitForTimeout(10000);
 
   const code = 'lm(mpg ~ wt + hp + disp + cyl, data=mtcars)';
-  const cell = page.locator('.jp-Cell').first();
+  const cell = page.locator('.jp-Cell').last();
   await cell.getByRole('textbox').fill(code);
 
   await runCommand(page, 'notebook:run-cell');
@@ -1077,7 +1077,7 @@ test.describe('Kernel networking', () => {
     await page.waitForSelector('.jp-NotebookPanel');
 
     const code = `read.csv("${remoteUrl}")`;
-    const cell = page.locator('.jp-Cell').first();
+    const cell = page.locator('.jp-Cell').last();
     await cell.getByRole('textbox').fill(code);
 
     await runCommand(page, 'notebook:run-cell');

From f6a0b8b6b6f936ab7657bfbfe8d6b60ddb662511 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 03:37:46 +0530
Subject: [PATCH 10/20] Try again with new path

---
 ui-tests/package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui-tests/package.json b/ui-tests/package.json
index f5dc5399..92cc13e9 100644
--- a/ui-tests/package.json
+++ b/ui-tests/package.json
@@ -4,7 +4,7 @@
   "description": "Jupyter Everywhere Integration Tests",
   "private": true,
   "scripts": {
-    "start": "npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ../dist",
+    "start": "cd ../dist && npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ./",
     "test": "jlpm playwright test",
     "test:update": "jlpm playwright test --update-snapshots"
   },

From b353ea5fb3d1295152c80f534b77962476460e5d Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 03:42:42 +0530
Subject: [PATCH 11/20] Try again

---
 ui-tests/package.json | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/ui-tests/package.json b/ui-tests/package.json
index 92cc13e9..6ef5459d 100644
--- a/ui-tests/package.json
+++ b/ui-tests/package.json
@@ -4,13 +4,12 @@
   "description": "Jupyter Everywhere Integration Tests",
   "private": true,
   "scripts": {
-    "start": "cd ../dist && npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ./",
+    "start": "cd ../dist && npx static-handler --coi -p 3000 ./",
     "test": "jlpm playwright test",
     "test:update": "jlpm playwright test --update-snapshots"
   },
   "devDependencies": {
     "@jupyterlab/application": "^4.5.0-beta.1",
-    "@playwright/test": "^1.57.0",
-    "static-handler": "^0.4.1"
+    "@playwright/test": "^1.57.0"
   }
 }

From ca8a86cadc68a34d861f3b2f35a2a5224687bd9c Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 04:02:09 +0530
Subject: [PATCH 12/20] Revert "Try again"

This reverts commit b353ea5fb3d1295152c80f534b77962476460e5d.
---
 ui-tests/package.json | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ui-tests/package.json b/ui-tests/package.json
index 6ef5459d..92cc13e9 100644
--- a/ui-tests/package.json
+++ b/ui-tests/package.json
@@ -4,12 +4,13 @@
   "description": "Jupyter Everywhere Integration Tests",
   "private": true,
   "scripts": {
-    "start": "cd ../dist && npx static-handler --coi -p 3000 ./",
+    "start": "cd ../dist && npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ./",
     "test": "jlpm playwright test",
     "test:update": "jlpm playwright test --update-snapshots"
   },
   "devDependencies": {
     "@jupyterlab/application": "^4.5.0-beta.1",
-    "@playwright/test": "^1.57.0"
+    "@playwright/test": "^1.57.0",
+    "static-handler": "^0.4.1"
   }
 }

From 23c49c5b7025985a51dd08ba579d03cfba2f64e0 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 04:02:12 +0530
Subject: [PATCH 13/20] Revert "Try again with new path"

This reverts commit f6a0b8b6b6f936ab7657bfbfe8d6b60ddb662511.
---
 ui-tests/package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui-tests/package.json b/ui-tests/package.json
index 92cc13e9..f5dc5399 100644
--- a/ui-tests/package.json
+++ b/ui-tests/package.json
@@ -4,7 +4,7 @@
   "description": "Jupyter Everywhere Integration Tests",
   "private": true,
   "scripts": {
-    "start": "cd ../dist && npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ./",
+    "start": "npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ../dist",
     "test": "jlpm playwright test",
     "test:update": "jlpm playwright test --update-snapshots"
   },

From 72da918ab865ed2c617ea22d3c20a1f0c5515542 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 04:02:18 +0530
Subject: [PATCH 14/20] Revert "Try to run tests outside Python's
 `http.server`"

This reverts commit d547c1ff246a025cb32db3148d71340f9f0480e2.
---
 ui-tests/package.json | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/ui-tests/package.json b/ui-tests/package.json
index f5dc5399..467d7f38 100644
--- a/ui-tests/package.json
+++ b/ui-tests/package.json
@@ -4,13 +4,12 @@
   "description": "Jupyter Everywhere Integration Tests",
   "private": true,
   "scripts": {
-    "start": "npx static-handler --cors --coop --coep --corp --port 3000 --host 127.0.0.1 ../dist",
+    "start": "cd ../dist && python -m http.server -b 127.0.0.1 3000",
     "test": "jlpm playwright test",
     "test:update": "jlpm playwright test --update-snapshots"
   },
   "devDependencies": {
     "@jupyterlab/application": "^4.5.0-beta.1",
-    "@playwright/test": "^1.57.0",
-    "static-handler": "^0.4.1"
+    "@playwright/test": "^1.57.0"
   }
 }

From c4e221f7a3ad0122ba938ddef9378153362c3091 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 04:01:48 +0530
Subject: [PATCH 15/20] More logging...

---
 ui-tests/playwright.config.js            |  7 ++++-
 ui-tests/tests/jupytereverywhere.spec.ts | 38 ++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/ui-tests/playwright.config.js b/ui-tests/playwright.config.js
index be93efbd..e537a61c 100644
--- a/ui-tests/playwright.config.js
+++ b/ui-tests/playwright.config.js
@@ -15,7 +15,12 @@ module.exports = {
     autoGoto: false,
     baseURL: 'http://localhost:3000',
     trace: 'retain-on-failure',
-    video: 'retain-on-failure'
+    video: 'retain-on-failure',
+    screenshot: 'only-on-failure',
+    // Capture browser console logs
+    launchOptions: {
+      args: process.env.CI ? ['--disable-dev-shm-usage'] : []
+    }
   },
   webServer: {
     command: 'jlpm start',
diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index 92d549c9..d8c75e21 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1044,6 +1044,25 @@ test.describe('Kernel Switching', () => {
 });
 
 test('Should switch to R kernel and run R code', async ({ page }) => {
+  const consoleMessages: string[] = [];
+  const pageErrors: string[] = [];
+
+  page.on('console', msg => {
+    const text = `[${msg.type()}] ${msg.text()}`;
+    consoleMessages.push(text);
+    console.log(text);
+  });
+
+  page.on('pageerror', error => {
+    const errorText = `Page error: ${error.message}\n${error.stack}`;
+    pageErrors.push(errorText);
+    console.error(errorText);
+  });
+
+  page.on('crash', () => {
+    console.error('PAGE CRASHED!');
+  });
+
   await page.goto('lab/index.html');
   await page.waitForSelector('.jp-NotebookPanel');
 
@@ -1073,6 +1092,25 @@ test.describe('Kernel networking', () => {
   const expectedContent = 'col1';
 
   test('R kernel should be able to fetch from a remote URL', async ({ page }) => {
+    const consoleMessages: string[] = [];
+    const pageErrors: string[] = [];
+
+    page.on('console', msg => {
+      const text = `[${msg.type()}] ${msg.text()}`;
+      consoleMessages.push(text);
+      console.log(text);
+    });
+
+    page.on('pageerror', error => {
+      const errorText = `Page error: ${error.message}\n${error.stack}`;
+      pageErrors.push(errorText);
+      console.error(errorText);
+    });
+
+    page.on('crash', () => {
+      console.error('PAGE CRASHED!');
+    });
+
     await page.goto('lab/index.html?kernel=r');
     await page.waitForSelector('.jp-NotebookPanel');
 

From 732434d8d378d6ce68e068cbbef3ffad09b5e936 Mon Sep 17 00:00:00 2001
From: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>
Date: Fri, 12 Dec 2025 04:27:34 +0530
Subject: [PATCH 16/20] Try one more time

---
 ui-tests/tests/jupytereverywhere.spec.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ui-tests/tests/jupytereverywhere.spec.ts b/ui-tests/tests/jupytereverywhere.spec.ts
index d8c75e21..b253fbed 100644
--- a/ui-tests/tests/jupytereverywhere.spec.ts
+++ b/ui-tests/tests/jupytereverywhere.spec.ts
@@ -1066,8 +1066,11 @@ test('Should switch to R kernel and run R code', async ({ page }) => {
   await page.goto('lab/index.html');
   await page.waitForSelector('.jp-NotebookPanel');
 
+  // Wait for Python kernel to fully initialise
+  await page.waitForTimeout(30000);
+
   await runCommand(page, 'jupytereverywhere:switch-kernel', { kernel: 'xr' });
-  await page.waitForTimeout(10000);
+  await page.waitForTimeout(30000);
 
   const code = 'lm(mpg ~ wt + hp + disp + cyl, data=mtcars)';
   const cell = page.locator('.jp-Cell').last();

From 879e31e57dc8d3a8af7946d65e67a66242a5faed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Krassowski?=
 <5832902+krassowski@users.noreply.github.com>
Date: Mon, 15 Dec 2025 14:44:44 +0000
Subject: [PATCH 17/20] Try latest

---
 lite/requirements.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lite/requirements.txt b/lite/requirements.txt
index d481df07..d8e91574 100644
--- a/lite/requirements.txt
+++ b/lite/requirements.txt
@@ -1,3 +1,3 @@
 jupyterlite==0.7.0
 jupyterlite-pyodide-kernel==0.7
-jupyterlite-xeus==4.3.4
+jupyterlite-xeus==4.3.6

From 9bf08822d26704b348a9524585dcd62b0b518960 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Krassowski?=
 <5832902+krassowski@users.noreply.github.com>
Date: Mon, 15 Dec 2025 15:10:00 +0000
Subject: [PATCH 18/20] Try 4.2.2

---
 lite/requirements.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lite/requirements.txt b/lite/requirements.txt
index d8e91574..291ef1d1 100644
--- a/lite/requirements.txt
+++ b/lite/requirements.txt
@@ -1,3 +1,3 @@
 jupyterlite==0.7.0
 jupyterlite-pyodide-kernel==0.7
-jupyterlite-xeus==4.3.6
+jupyterlite-xeus==4.2.2

From 708f4dbc9ad4b1797fac8dbf05d63ce5fb8a40b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Krassowski?=
 <5832902+krassowski@users.noreply.github.com>
Date: Mon, 15 Dec 2025 15:36:44 +0000
Subject: [PATCH 19/20] 4.2.1

---
 lite/requirements.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lite/requirements.txt b/lite/requirements.txt
index 291ef1d1..ec7f264f 100644
--- a/lite/requirements.txt
+++ b/lite/requirements.txt
@@ -1,3 +1,3 @@
 jupyterlite==0.7.0
 jupyterlite-pyodide-kernel==0.7
-jupyterlite-xeus==4.2.2
+jupyterlite-xeus==4.2.1

From a14858e87b55d1a118d5323a31f163f016bdf40f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Krassowski?=
 <5832902+krassowski@users.noreply.github.com>
Date: Mon, 15 Dec 2025 16:02:30 +0000
Subject: [PATCH 20/20] 4.2.0

---
 lite/requirements.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lite/requirements.txt b/lite/requirements.txt
index ec7f264f..8a4fda79 100644
--- a/lite/requirements.txt
+++ b/lite/requirements.txt
@@ -1,3 +1,3 @@
 jupyterlite==0.7.0
 jupyterlite-pyodide-kernel==0.7
-jupyterlite-xeus==4.2.1
+jupyterlite-xeus==4.2.0