diff --git a/extensions/ipynb/src/cellIdService.ts b/extensions/ipynb/src/cellIdService.ts
index ddda0a9fd5f..2eccb586ef4 100644
--- a/extensions/ipynb/src/cellIdService.ts
+++ b/extensions/ipynb/src/cellIdService.ts
@@ -8,7 +8,7 @@ import { v4 as uuid } from 'uuid';
 import { getCellMetadata } from './serializers';
 import { CellMetadata } from './common';
 import { getNotebookMetadata } from './notebookSerializer';
-import * as nbformat from '@jupyterlab/nbformat';
+import type * as nbformat from '@jupyterlab/nbformat';
 
 /**
  * Ensure all new cells in notebooks with nbformat >= 4.5 have an id.
diff --git a/extensions/ipynb/src/common.ts b/extensions/ipynb/src/common.ts
index 047814ecfc1..d5ff5f86069 100644
--- a/extensions/ipynb/src/common.ts
+++ b/extensions/ipynb/src/common.ts
@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as nbformat from '@jupyterlab/nbformat';
+import type * as nbformat from '@jupyterlab/nbformat';
 
 /**
  * Metadata we store in VS Code cell output items.
diff --git a/extensions/ipynb/src/deserializers.ts b/extensions/ipynb/src/deserializers.ts
index 50a3a1271b0..92cd20bb33a 100644
--- a/extensions/ipynb/src/deserializers.ts
+++ b/extensions/ipynb/src/deserializers.ts
@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as nbformat from '@jupyterlab/nbformat';
+import type * as nbformat from '@jupyterlab/nbformat';
 import { extensions, NotebookCellData, NotebookCellExecutionSummary, NotebookCellKind, NotebookCellOutput, NotebookCellOutputItem, NotebookData } from 'vscode';
 import { CellMetadata, CellOutputMetadata } from './common';
 
diff --git a/extensions/ipynb/src/notebookSerializer.ts b/extensions/ipynb/src/notebookSerializer.ts
index 37eee49b1be..0c3ccd09723 100644
--- a/extensions/ipynb/src/notebookSerializer.ts
+++ b/extensions/ipynb/src/notebookSerializer.ts
@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as nbformat from '@jupyterlab/nbformat';
+import type * as nbformat from '@jupyterlab/nbformat';
 import * as detectIndent from 'detect-indent';
 import * as vscode from 'vscode';
 import { defaultNotebookFormat } from './constants';
diff --git a/extensions/ipynb/src/serializers.ts b/extensions/ipynb/src/serializers.ts
index 078bb408cc5..455fb0d2745 100644
--- a/extensions/ipynb/src/serializers.ts
+++ b/extensions/ipynb/src/serializers.ts
@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as nbformat from '@jupyterlab/nbformat';
+import type * as nbformat from '@jupyterlab/nbformat';
 import { NotebookCell, NotebookCellData, NotebookCellKind, NotebookCellOutput } from 'vscode';
 import { CellMetadata, CellOutputMetadata } from './common';
 import { textMimeTypes } from './deserializers';
diff --git a/extensions/ipynb/src/test/serializers.test.ts b/extensions/ipynb/src/test/serializers.test.ts
index 15ef1185f94..2a59c73532e 100644
--- a/extensions/ipynb/src/test/serializers.test.ts
+++ b/extensions/ipynb/src/test/serializers.test.ts
@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as nbformat from '@jupyterlab/nbformat';
+import type * as nbformat from '@jupyterlab/nbformat';
 import * as assert from 'assert';
 import * as vscode from 'vscode';
 import { jupyterCellOutputToCellOutput, jupyterNotebookModelToNotebookData } from '../deserializers';