Require tornado>=6.1.0

binder/environment.yml

@@ -8,6 +8,5 @@ dependencies:
   - numpy
   - pip
   - python=3.8
-  - tornado>=6.1
   - vega_datasets
   - xeus-python

setup.py

@@ -144,7 +144,7 @@ setup_args = dict(
 setup_args['install_requires'] = [
     'ipython',
     'packaging',
-    'tornado!=6.0.0, !=6.0.1, !=6.0.2',
+    'tornado>=6.1.0',
     'jupyter_core',
     'jupyterlab_server~=2.0.0rc5',
     'jupyter_server~=1.0.1',