diff --git a/packages/celltags/src/addwidget.ts b/packages/celltags/src/addwidget.ts
index a003b497cc10..436e88ed38f3 100644
--- a/packages/celltags/src/addwidget.ts
+++ b/packages/celltags/src/addwidget.ts
@@ -1,4 +1,4 @@
-import { Widget } from '@phosphor/widgets';
+import { Widget } from '@lumino/widgets';
 
 import { defaultIconRegistry } from '@jupyterlab/ui-components';
 
diff --git a/packages/celltags/src/tool.ts b/packages/celltags/src/tool.ts
index 2f4311f21f28..e4e8cf94dcf1 100644
--- a/packages/celltags/src/tool.ts
+++ b/packages/celltags/src/tool.ts
@@ -1,4 +1,4 @@
-import { PanelLayout } from '@phosphor/widgets';
+import { PanelLayout } from '@lumino/widgets';
 
 import { NotebookTools, INotebookTracker } from '@jupyterlab/notebook';
 
diff --git a/packages/celltags/src/widget.ts b/packages/celltags/src/widget.ts
index 6bf37306bba4..434c12658793 100644
--- a/packages/celltags/src/widget.ts
+++ b/packages/celltags/src/widget.ts
@@ -1,4 +1,4 @@
-import { Widget } from '@phosphor/widgets';
+import { Widget } from '@lumino/widgets';
 
 import { defaultIconRegistry } from '@jupyterlab/ui-components';
 
diff --git a/packages/celltags/style/index.css b/packages/celltags/style/index.css
index bc576e569e3d..b8a4c6f09b70 100644
--- a/packages/celltags/style/index.css
+++ b/packages/celltags/style/index.css
@@ -4,7 +4,7 @@
 |----------------------------------------------------------------------------*/
 
 /* This file was auto-generated by ensurePackage() in @jupyterlab/buildutils */
-@import url('~@phosphor/widgets/style/index.css');
+@import url('~@lumino/widgets/style/index.css');
 @import url('~@jupyterlab/ui-components/style/index.css');
 @import url('~@jupyterlab/application/style/index.css');
 @import url('~@jupyterlab/cells/style/index.css');