diff --git a/extra/jupyterlab/.SRCINFO b/extra/jupyterlab/.SRCINFO
index 30384e35e..7db06c0aa 100644
--- a/extra/jupyterlab/.SRCINFO
+++ b/extra/jupyterlab/.SRCINFO
@@ -1,6 +1,6 @@
 pkgbase = jupyterlab
 	pkgdesc = JupyterLab computational environment
-	pkgver = 4.2.0
+	pkgver = 4.2.1
 	pkgrel = 1
 	url = https://github.com/jupyterlab/jupyterlab
 	arch = any
@@ -28,7 +28,7 @@ pkgbase = jupyterlab
 	optdepends = jupyter-collaboration: collaborative mode
 	optdepends = jupyterlab-widgets: ipywidgets support
 	optdepends = npm: to install extensions
-	source = git+https://github.com/jupyterlab/jupyterlab#tag=v4.2.0
-	sha256sums = 275fcf3831f8302ea3d7f343847747b4fa7abef96df0d34a518941d739c4dc6b
+	source = git+https://github.com/jupyterlab/jupyterlab#tag=v4.2.1
+	sha256sums = c867030c090caa36a2e48bff0c82dd5e35ffa96991509b62ca00b7b464a15820
 
 pkgname = jupyterlab
diff --git a/extra/jupyterlab/PKGBUILD b/extra/jupyterlab/PKGBUILD
index 022372cce..c7ebb6782 100644
--- a/extra/jupyterlab/PKGBUILD
+++ b/extra/jupyterlab/PKGBUILD
@@ -6,7 +6,7 @@
 
 pkgname=jupyterlab
 _pipname=jupyterlab
-pkgver=4.2.0
+pkgver=4.2.1
 pkgrel=1
 pkgdesc='JupyterLab computational environment'
 arch=(any)
@@ -36,10 +36,12 @@ checkdepends=(python-jupyter-server-terminals
               python-pytest-jupyter
               python-pytest-tornasync)
 source=(git+https://github.com/jupyterlab/jupyterlab#tag=v$pkgver)
-sha256sums=('275fcf3831f8302ea3d7f343847747b4fa7abef96df0d34a518941d739c4dc6b')
+sha256sums=('c867030c090caa36a2e48bff0c82dd5e35ffa96991509b62ca00b7b464a15820')
 
 build() {
   cd $pkgname
+# https://github.com/nodejs/node/issues/48444
+  export UV_USE_IO_URING=0
   export NODE_OPTIONS=--max-old-space-size=1024
   python -m build --wheel --no-isolation
 }