Merge pull request #8325 from blink1073/pin-jupyterlab-server

Pin jupyterlab_server requirement

packages/services/test/kernel/ikernel.spec.ts

@@ -41,7 +41,7 @@ describe('Kernel.IKernel', () => {
   let kernelManager: KernelManager;
 
   beforeAll(async () => {
-    jest.setTimeout(20000);
+    jest.setTimeout(120000);
     kernelManager = new KernelManager();
     specs = await KernelSpecAPI.getSpecs();
   });

setup.py

@@ -139,7 +139,7 @@ setup_args = dict(
 setup_args['install_requires'] = [
     'notebook>=4.3.1',
     'tornado!=6.0.0, !=6.0.1, !=6.0.2',
-    'jupyterlab_server>=1.1.0',
+    'jupyterlab_server>=1.1.0, <2.0',
     'jinja2>=2.10'
 ]