# upgrade VTK
**URL:** https://discourse.vtk.org/t/upgrade-vtk/1466
**Category:** Support
**Created:** [August 1, 2019, 12:50pm UTC](https://discourse.vtk.org/t/upgrade-vtk/1466 "2019-08-01T12:50:04Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Saadana](https://discourse.vtk.org/u/Saadana)
#### Post date: [August 1, 2019, 12:50pm UTC](https://discourse.vtk.org/t/upgrade-vtk/1466/1 "2019-08-01T12:50:04Z")
Hello,
I want to upgrade from version 8.1.2 to the latest version 8.2.0.
Is it necessary to remove the entire version 8.1.2 to reinstall VTK 8.2.0?
What do I have to do to install it in both release and debug modes?
Thank you in advance for your answer.
best regards
Hamdi
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### Author:  [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [August 1, 2019, 2:28pm UTC](https://discourse.vtk.org/t/upgrade-vtk/1466/2 "2019-08-01T14:28:44Z")
Most probably you need to rebuild your entire project, not just VTK.
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### Author:  [@Saadana](https://discourse.vtk.org/u/Saadana)
#### Post date: [August 2, 2019, 8:21am UTC](https://discourse.vtk.org/t/upgrade-vtk/1466/3 "2019-08-02T08:21:16Z")
Okay,
So I have to delete the old version of vtk?
Regards
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### Author:  [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [August 2, 2019, 12:47pm UTC](https://discourse.vtk.org/t/upgrade-vtk/1466/4 "2019-08-02T12:47:22Z")
Yes, I would recommend to remove the entire build tree and rebuild the whole project if build fails after a major update of a library.
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### Author:  [@francek](https://discourse.vtk.org/u/francek)
#### Post date: [August 2, 2019, 5:07pm UTC](https://discourse.vtk.org/t/upgrade-vtk/1466/5 "2019-08-02T17:07:02Z")
Hi,
You can choose where your libs will be installed by editing ‘CMAKE\_INSTALL\_PREFIX’ variable during the build configuration in cmake GUI:
