diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5b5c1bd..78b4137 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,9 +35,6 @@ jobs:
         set -eux
         python -m pip install .[test]
 
-        jupyter server extension list
-        jupyter server extension list 2>&1 | grep -ie "jupyterlab_cell_diff.*OK"
-
         jupyter labextension list
         jupyter labextension list 2>&1 | grep -ie "jupyterlab-cell-diff.*OK"
         python -m jupyterlab.browser_check
@@ -79,10 +76,6 @@ jobs:
 
         pip install "jupyterlab>=4.0.0,<5" jupyterlab_cell_diff*.whl
 
-
-        jupyter server extension list
-        jupyter server extension list 2>&1 | grep -ie "jupyterlab_cell_diff.*OK"
-
         jupyter labextension list
         jupyter labextension list 2>&1 | grep -ie "jupyterlab-cell-diff.*OK"
         python -m jupyterlab.browser_check --no-browser-test
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d80ab52..75fe0c0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -15,8 +15,6 @@ The `jlpm` command is JupyterLab's pinned version of
 pip install -e "."
 # Link your development version of the extension with JupyterLab
 jupyter labextension develop . --overwrite
-# Server extension must be manually installed in develop mode
-jupyter server extension enable jupyterlab_cell_diff
 # Rebuild extension Typescript source after making changes
 jlpm build
 ```
@@ -42,7 +40,6 @@ jupyter lab build --minimize=False
 
 ```bash
 # Server extension must be manually disabled in develop mode
-jupyter server extension disable jupyterlab_cell_diff
 pip uninstall jupyterlab_cell_diff
 ```
 
diff --git a/README.md b/README.md
index e8d5449..8f2a673 100644
--- a/README.md
+++ b/README.md
@@ -32,19 +32,12 @@ jupyter labextension develop . --overwrite
 
 ### Commands
 
-The extension provides several commands:
+The extension provides a command to show cell diffs:
 
 - `jupyterlab-cell-diff:show-codemirror` - Show diff using `@codemirror/merge`
-- `jupyterlab-cell-diff:show-nbdime` - Show diff using NBDime
-
-### Use with `@codemirror/merge`
 
 https://github.com/user-attachments/assets/0dacd7f0-5963-4ebe-81da-2958f0117071
 
-### Use with NBDime
-
-https://github.com/user-attachments/assets/87e93eab-ad67-468c-b228-f5a0e93f8bea
-
 ### Programmatic Usage
 
 ```typescript
@@ -53,12 +46,6 @@ app.commands.execute('jupyterlab-cell-diff:show-codemirror', {
   originalSource: 'print("Hello")',
   newSource: 'print("Hello, World!")'
 });
-
-app.commands.execute('jupyterlab-cell-diff:show-nbdime', {
-  cellId: 'cell-id',
-  originalSource: 'print("Hello")',
-  newSource: 'print("Hello, World!")'
-});
 ```
 
 ## Uninstall
@@ -71,15 +58,7 @@ pip uninstall jupyterlab_cell_diff
 
 ## Troubleshoot
 
-If you are seeing the frontend extension, but it is not working, check
-that the server extension is enabled:
-
-```bash
-jupyter server extension list
-```
-
-If the server extension is installed and enabled, but you are not seeing
-the frontend extension, check the frontend extension is installed:
+To check the frontend extension is installed:
 
 ```bash
 jupyter labextension list
diff --git a/jupyter-config/server-config/jupyterlab_cell_diff.json b/jupyter-config/server-config/jupyterlab_cell_diff.json
deleted file mode 100644
index e941408..0000000
--- a/jupyter-config/server-config/jupyterlab_cell_diff.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "ServerApp": {
-    "jpserver_extensions": {
-      "jupyterlab_cell_diff": true
-    }
-  }
-}
diff --git a/jupyterlab_cell_diff/__init__.py b/jupyterlab_cell_diff/__init__.py
index 4833b56..26f04d1 100644
--- a/jupyterlab_cell_diff/__init__.py
+++ b/jupyterlab_cell_diff/__init__.py
@@ -5,32 +5,10 @@
     # in editable mode with pip. It is highly recommended to install
     # the package from a stable release or in editable mode: https://pip.pypa.io/en/stable/topics/local-project-installs/#editable-installs
     import warnings
+
     warnings.warn("Importing 'jupyterlab_cell_diff' outside a proper installation.")
     __version__ = "dev"
-from .handlers import setup_handlers
 
 
 def _jupyter_labextension_paths():
-    return [{
-        "src": "labextension",
-        "dest": "jupyterlab-cell-diff"
-    }]
-
-
-def _jupyter_server_extension_points():
-    return [{
-        "module": "jupyterlab_cell_diff"
-    }]
-
-
-def _load_jupyter_server_extension(server_app):
-    """Registers the API handler to receive HTTP requests from the frontend extension.
-
-    Parameters
-    ----------
-    server_app: jupyterlab.labapp.LabApp
-        JupyterLab application instance
-    """
-    setup_handlers(server_app.web_app)
-    name = "jupyterlab_cell_diff"
-    server_app.log.info(f"Registered {name} server extension")
+    return [{"src": "labextension", "dest": "jupyterlab-cell-diff"}]
diff --git a/jupyterlab_cell_diff/handlers.py b/jupyterlab_cell_diff/handlers.py
deleted file mode 100644
index df61cb4..0000000
--- a/jupyterlab_cell_diff/handlers.py
+++ /dev/null
@@ -1,31 +0,0 @@
-import json
-
-from jupyter_server.base.handlers import APIHandler
-from jupyter_server.utils import url_path_join
-import tornado
-
-from nbdime.diffing.generic import diff
-
-
-class RouteHandler(APIHandler):
-    # The following decorator should be present on all verb methods (head, get, post,
-    # patch, put, delete, options) to ensure only authorized user can request the
-    # Jupyter server
-    @tornado.web.authenticated
-    def post(self):
-        body = self.get_json_body()        
-        previous = body.get("original_source")
-        current = body.get("new_source")
-        diff_results = diff(previous, current)
-        self.finish(json.dumps({
-            "original_source": previous,
-            "diff": diff_results
-        }))
-        
-
-def setup_handlers(web_app):
-    host_pattern = ".*$"
-    base_url = web_app.settings["base_url"]
-    route_pattern = url_path_join(base_url, "api", "celldiff")
-    handlers = [(route_pattern, RouteHandler)]
-    web_app.add_handlers(host_pattern, handlers)
diff --git a/package.json b/package.json
index 25c070b..37b8f8c 100644
--- a/package.json
+++ b/package.json
@@ -70,8 +70,7 @@
         "@jupyterlab/ui-components": "^4.0.0",
         "@lumino/widgets": "^2.0.0",
         "codemirror": "^6.0.2",
-        "jupyterlab-cell-input-footer": "^0.3.0",
-        "nbdime": "^7.0.1"
+        "jupyterlab-cell-input-footer": "^0.3.0"
     },
     "devDependencies": {
         "@jupyterlab/builder": "^4.0.0",
diff --git a/pyproject.toml b/pyproject.toml
index e5d5149..3bb63b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "hatchling.build"
 name = "jupyterlab_cell_diff"
 readme = "README.md"
 license = { file = "LICENSE" }
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     "Framework :: Jupyter",
     "Framework :: Jupyter :: JupyterLab",
@@ -16,15 +16,13 @@ classifiers = [
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 dependencies = [
-    "nbdime",
-    "jupyter_server>=2.4.0,<3",
     "jupyterlab-eventlistener>=0.4.0,<0.5",
     "jupyterlab-cell-input-footer>=0.3.1,<0.4"
 ]
@@ -43,7 +41,6 @@ exclude = [".github", "binder"]
 [tool.hatch.build.targets.wheel.shared-data]
 "jupyterlab_cell_diff/labextension" = "share/jupyter/labextensions/jupyterlab-cell-diff"
 "install.json" = "share/jupyter/labextensions/jupyterlab-cell-diff/install.json"
-"jupyter-config/server-config" = "etc/jupyter/jupyter_server_config.d"
 
 [tool.hatch.build.hooks.version]
 path = "jupyterlab_cell_diff/_version.py"
diff --git a/src/diff/nbdime.ts b/src/diff/nbdime.ts
deleted file mode 100644
index 900ae5c..0000000
--- a/src/diff/nbdime.ts
+++ /dev/null
@@ -1,80 +0,0 @@
-import { IDiffWidgetOptions } from '../widget';
-import { IDiffEntry } from 'nbdime/lib/diff/diffentries';
-import { createPatchStringDiffModel } from 'nbdime/lib/diff/model';
-import { MergeView } from 'nbdime/lib/common/mergeview';
-import { Widget } from '@lumino/widgets';
-import { BaseDiffWidget } from '../widget';
-
-/**
- * Options for creating an NBDime diff widget
- */
-interface INBDimeDiffWidgetOptions extends IDiffWidgetOptions {
-  remote: any;
-}
-
-/**
- * Extended NBDime MergeView widget with action buttons support
- */
-class NBDimeDiffWidget extends BaseDiffWidget {
-  /**
-   * Construct a new NBDimeDiffWidget.
-   */
-  constructor(options: INBDimeDiffWidgetOptions) {
-    super(options);
-
-    // Create the NBDime merge view as a child widget
-    this._mergeView = new MergeView({ remote: options.remote });
-    this._mergeView.addClass('nbdime-diff-widget');
-    this._mergeView.addClass('jp-cell-diff');
-    this._mergeView.addClass('nbdime-root');
-    this._mergeView.addClass('jp-Notebook-diff');
-
-    // Add the merge view to this widget's node
-    this.node.appendChild(this._mergeView.node);
-    this.addClass('jp-DiffView');
-  }
-  private _mergeView: MergeView;
-}
-
-/**
- * Create a diff widget using NBDime
- */
-export async function createNBDimeDiffWidget(
-  options: IDiffWidgetOptions
-): Promise<Widget> {
-  const {
-    cell,
-    cellFooterTracker,
-    originalSource,
-    newSource,
-    diffData,
-    trans,
-    showActionButtons = true,
-    openDiff = true
-  } = options;
-
-  if (!diffData || !diffData.diff) {
-    throw new Error(trans.__('NBDime strategy requires diff data'));
-  }
-
-  const diff = createPatchStringDiffModel(
-    originalSource,
-    diffData.diff as IDiffEntry[]
-  );
-
-  const diffWidget = new NBDimeDiffWidget({
-    remote: diff,
-    cell,
-    cellFooterTracker,
-    originalSource,
-    newSource,
-    showActionButtons,
-    openDiff,
-    trans
-  });
-
-  diffWidget.addClass('jupyterlab-cell-diff');
-  diffWidget.addToFooter();
-
-  return diffWidget;
-}
diff --git a/src/handler.ts b/src/handler.ts
deleted file mode 100644
index a746896..0000000
--- a/src/handler.ts
+++ /dev/null
@@ -1,42 +0,0 @@
-import { URLExt } from '@jupyterlab/coreutils';
-
-import { ServerConnection } from '@jupyterlab/services';
-
-/**
- * Call the API extension
- *
- * @param endPoint API REST end point for the extension
- * @param init Initial values for the request
- * @returns The response body interpreted as JSON
- */
-export async function requestAPI<T>(
-  endPoint = '',
-  init: RequestInit = {}
-): Promise<T> {
-  // Make request to Jupyter API
-  const settings = ServerConnection.makeSettings();
-  const requestUrl = URLExt.join(settings.baseUrl, endPoint);
-
-  let response: Response;
-  try {
-    response = await ServerConnection.makeRequest(requestUrl, init, settings);
-  } catch (error) {
-    throw new ServerConnection.NetworkError(error as any);
-  }
-
-  let data: any = await response.text();
-
-  if (data.length > 0) {
-    try {
-      data = JSON.parse(data);
-    } catch (error) {
-      console.log('Not a JSON response body.', response);
-    }
-  }
-
-  if (!response.ok) {
-    throw new ServerConnection.ResponseError(response, data.message || data);
-  }
-
-  return data;
-}
diff --git a/src/plugin.ts b/src/plugin.ts
index 89a5f0c..c0c9eb4 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -7,9 +7,7 @@ import { INotebookTracker, NotebookPanel } from '@jupyterlab/notebook';
 import { ITranslator, nullTranslator } from '@jupyterlab/translation';
 import { ICellFooterTracker } from 'jupyterlab-cell-input-footer';
 
-import { requestAPI } from './handler';
 import { IDiffWidgetOptions } from './widget';
-import { createNBDimeDiffWidget } from './diff/nbdime';
 import { createCodeMirrorDiffWidget } from './diff/codemirror';
 
 /**
@@ -161,130 +159,4 @@ const codeMirrorPlugin: JupyterFrontEndPlugin<void> = {
   }
 };
 
-/**
- * NBDime diff plugin
- */
-const nbdimePlugin: JupyterFrontEndPlugin<void> = {
-  id: 'jupyterlab-cell-diff:nbdime-plugin',
-  description: 'Expose a command to show cell diffs using NBDime',
-  requires: [ICellFooterTracker, INotebookTracker],
-  optional: [ITranslator],
-  autoStart: true,
-  activate: async (
-    app: JupyterFrontEnd,
-    cellFooterTracker: ICellFooterTracker,
-    notebookTracker: INotebookTracker,
-    translator: ITranslator | null
-  ) => {
-    const { commands } = app;
-    const trans = (translator ?? nullTranslator).load(TRANSLATION_NAMESPACE);
-
-    commands.addCommand('jupyterlab-cell-diff:show-nbdime', {
-      label: trans.__('Show Cell Diff (NBDime)'),
-      describedBy: {
-        args: {
-          type: 'object',
-          properties: {
-            cellId: {
-              type: 'string',
-              description: trans.__('ID of the cell to show diff for')
-            },
-            originalSource: {
-              type: 'string',
-              description: trans.__('Original source code to compare against')
-            },
-            newSource: {
-              type: 'string',
-              description: trans.__('New source code to compare with')
-            },
-            showActionButtons: {
-              type: 'boolean',
-              description: trans.__(
-                'Whether to show action buttons in the diff widget'
-              )
-            },
-            notebookPath: {
-              type: 'string',
-              description: trans.__('Path to the notebook containing the cell')
-            },
-            openDiff: {
-              type: 'boolean',
-              description: trans.__(
-                'Whether to open the diff widget automatically'
-              )
-            }
-          }
-        }
-      },
-      execute: async (args: any = {}) => {
-        const {
-          cellId,
-          originalSource,
-          newSource,
-          showActionButtons = true,
-          notebookPath,
-          openDiff = true
-        } = args;
-
-        const currentNotebook = findNotebook(notebookTracker, notebookPath);
-        if (!currentNotebook) {
-          return;
-        }
-
-        const cell = findCell(currentNotebook, cellId);
-        if (!cell) {
-          console.error(
-            trans.__(
-              'Missing required arguments: cellId (or no active cell found)'
-            )
-          );
-          return;
-        }
-
-        // For NBDime, fetch diff data from server
-        let diffData;
-        try {
-          const response = await requestAPI<any>('api/celldiff', {
-            method: 'POST',
-            body: JSON.stringify({
-              original_source: originalSource,
-              new_source: newSource
-            })
-          });
-          diffData = (response as any).diff;
-        } catch (error) {
-          console.warn(
-            trans.__('Failed to fetch diff data from server: %1'),
-            error
-          );
-        }
-
-        const footer = cellFooterTracker.getFooter(cell.id);
-        if (!footer) {
-          console.error(trans.__('Footer not found for cell %1', cell.id));
-          return;
-        }
-
-        try {
-          const options: IDiffWidgetOptions = {
-            cell,
-            cellFooterTracker,
-            originalSource,
-            newSource,
-            diffData: diffData ? { diff: diffData } : undefined,
-            cellId: cell.id,
-            showActionButtons,
-            openDiff,
-            trans
-          };
-
-          await createNBDimeDiffWidget(options);
-        } catch (error) {
-          console.error(trans.__('Failed to create diff widget: %1'), error);
-        }
-      }
-    });
-  }
-};
-
-export default [codeMirrorPlugin, nbdimePlugin];
+export default [codeMirrorPlugin];
diff --git a/src/widget.ts b/src/widget.ts
index 0caabfa..edad717 100644
--- a/src/widget.ts
+++ b/src/widget.ts
@@ -33,11 +33,6 @@ export interface IDiffWidgetOptions {
    */
   trans: TranslationBundle;
 
-  /**
-   * Additional diff data (for nbdime strategy)
-   */
-  diffData?: any;
-
   /**
    * Cell ID for identification
    */
diff --git a/style/base.css b/style/base.css
index a3e9802..80bbfcf 100644
--- a/style/base.css
+++ b/style/base.css
@@ -24,9 +24,3 @@
   max-height: 400px;
   overflow: auto;
 }
-
-/* NBDime diff widget styling */
-.nbdime-diff-widget {
-  max-height: 400px;
-  overflow: auto;
-}
diff --git a/yarn.lock b/yarn.lock
index 08b1bfa..cc47d8e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -122,7 +122,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/lang-markdown@npm:^6.1.1, @codemirror/lang-markdown@npm:^6.3.2":
+"@codemirror/lang-markdown@npm:^6.3.2":
   version: 6.3.4
   resolution: "@codemirror/lang-markdown@npm:6.3.4"
   dependencies:
@@ -227,7 +227,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/legacy-modes@npm:^6.3.2, @codemirror/legacy-modes@npm:^6.5.1":
+"@codemirror/legacy-modes@npm:^6.5.1":
   version: 6.5.1
   resolution: "@codemirror/legacy-modes@npm:6.5.1"
   dependencies:
@@ -271,7 +271,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/state@npm:^6.0.0, @codemirror/state@npm:^6.2.0, @codemirror/state@npm:^6.4.0, @codemirror/state@npm:^6.4.1, @codemirror/state@npm:^6.5.0, @codemirror/state@npm:^6.5.2":
+"@codemirror/state@npm:^6.0.0, @codemirror/state@npm:^6.4.0, @codemirror/state@npm:^6.4.1, @codemirror/state@npm:^6.5.0, @codemirror/state@npm:^6.5.2":
   version: 6.5.2
   resolution: "@codemirror/state@npm:6.5.2"
   dependencies:
@@ -280,7 +280,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@codemirror/view@npm:^6.0.0, @codemirror/view@npm:^6.14.0, @codemirror/view@npm:^6.17.0, @codemirror/view@npm:^6.23.0, @codemirror/view@npm:^6.26.3, @codemirror/view@npm:^6.27.0, @codemirror/view@npm:^6.35.0, @codemirror/view@npm:^6.38.1, @codemirror/view@npm:^6.38.2":
+"@codemirror/view@npm:^6.0.0, @codemirror/view@npm:^6.17.0, @codemirror/view@npm:^6.23.0, @codemirror/view@npm:^6.26.3, @codemirror/view@npm:^6.27.0, @codemirror/view@npm:^6.35.0, @codemirror/view@npm:^6.38.1, @codemirror/view@npm:^6.38.2":
   version: 6.38.2
   resolution: "@codemirror/view@npm:6.38.2"
   dependencies:
@@ -682,7 +682,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jupyterlab/codemirror@npm:^4.0.0, @jupyterlab/codemirror@npm:^4.3.3, @jupyterlab/codemirror@npm:^4.4.7":
+"@jupyterlab/codemirror@npm:^4.3.3, @jupyterlab/codemirror@npm:^4.4.7":
   version: 4.4.7
   resolution: "@jupyterlab/codemirror@npm:4.4.7"
   dependencies:
@@ -859,7 +859,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jupyterlab/nbformat@npm:^3.0.0 || ^4.0.0-alpha.21 || ^4.0.0, @jupyterlab/nbformat@npm:^4.0.0, @jupyterlab/nbformat@npm:^4.3.3, @jupyterlab/nbformat@npm:^4.4.7":
+"@jupyterlab/nbformat@npm:^3.0.0 || ^4.0.0-alpha.21 || ^4.0.0, @jupyterlab/nbformat@npm:^4.3.3, @jupyterlab/nbformat@npm:^4.4.7":
   version: 4.4.7
   resolution: "@jupyterlab/nbformat@npm:4.4.7"
   dependencies:
@@ -919,7 +919,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jupyterlab/outputarea@npm:^4.0.0, @jupyterlab/outputarea@npm:^4.3.3":
+"@jupyterlab/outputarea@npm:^4.3.3":
   version: 4.3.3
   resolution: "@jupyterlab/outputarea@npm:4.3.3"
   dependencies:
@@ -951,7 +951,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@jupyterlab/rendermime@npm:^4.0.0, @jupyterlab/rendermime@npm:^4.3.3":
+"@jupyterlab/rendermime@npm:^4.3.3":
   version: 4.3.3
   resolution: "@jupyterlab/rendermime@npm:4.3.3"
   dependencies:
@@ -1262,7 +1262,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@lumino/algorithm@npm:^2.0.1, @lumino/algorithm@npm:^2.0.2, @lumino/algorithm@npm:^2.0.3":
+"@lumino/algorithm@npm:^2.0.2, @lumino/algorithm@npm:^2.0.3":
   version: 2.0.3
   resolution: "@lumino/algorithm@npm:2.0.3"
   checksum: 03932cdc39d612a00579ee40bafb0b1d8bf5f8a12449f777a1ae7201843ddefb557bc3f9260aa6b9441d87bfc43e53cced854e71c4737de59e32cd00d4ac1394
@@ -1329,7 +1329,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@lumino/dragdrop@npm:^2.1.3, @lumino/dragdrop@npm:^2.1.5, @lumino/dragdrop@npm:^2.1.6":
+"@lumino/dragdrop@npm:^2.1.5, @lumino/dragdrop@npm:^2.1.6":
   version: 2.1.6
   resolution: "@lumino/dragdrop@npm:2.1.6"
   dependencies:
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