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Archived discussions · Captured October 28, 2026

newly discovered Bokeh incompatibility with new Tornado v4.5 release

Community Support
Luke_Canavan1
Luke_Canavan1

Hi Bokeh Users -

We’ve confirmed an incompatibility with Bokeh Server applications and the new Tornado v4.5 release. A current workaround is to downgrade Tornado to v4.4.2 as we work to diagnose and resolve this issue. You can track the progress of this issue at https://github.com/bokeh/bokeh/issues/6152

If you’re knowledgeable about tornado applications, we’d appreciate any help. Otherwise, we appreciate your patience and are glad that you’re part of the Bokeh community.

  • lukec
···

Luke Canavan

Software Developer

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Bryan
Bryan

FYI all, this is fixed in master and the latest dev build. Additionally the conda package in the defaults channel has had its dependencies updated to exclude Tornado 4.5

Thanks,

Bryan

···

On Apr 17, 2017, at 18:09, Luke Canavan <lcanavan@continuum.io> wrote:

Hi Bokeh Users -

We've confirmed an incompatibility with Bokeh Server applications and the new Tornado v4.5 release. A current workaround is to downgrade Tornado to v4.4.2 as we work to diagnose and resolve this issue. You can track the progress of this issue at Bokeh Server is incompatible with tornado=4.5 · Issue #6152 · bokeh/bokeh · GitHub

If you're knowledgeable about tornado applications, we'd appreciate any help. Otherwise, we appreciate your patience and are glad that you're part of the Bokeh community.

- lukec

--

Luke Canavan
Software Developer

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Angelo_Fausti
Angelo_Fausti

I’ve had the same problem here and took some time to figure out

If you install bokeh via pip, you still need to downgrade Tornado to 4.4.2

best,

···

On Sat, Apr 22, 2017 at 2:45 PM, Bryan Van de ven bryan@bokeh.org wrote:

FYI all, this is fixed in master and the latest dev build. Additionally the conda package in the defaults channel has had its dependencies updated to exclude Tornado 4.5

Thanks,

Bryan

On Apr 17, 2017, at 18:09, Luke Canavan lcanavan@continuum.io wrote:

Hi Bokeh Users -

We’ve confirmed an incompatibility with Bokeh Server applications and the new Tornado v4.5 release. A current workaround is to downgrade Tornado to v4.4.2 as we work to diagnose and resolve this issue. You can track the progress of this issue at https://github.com/bokeh/bokeh/issues/6152

If you’re knowledgeable about tornado applications, we’d appreciate any help. Otherwise, we appreciate your patience and are glad that you’re part of the Bokeh community.

  • lukec

–

Luke Canavan

Software Developer

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Angelo Fausti Neto
LIneA/LSST

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