# itk pip package fails to install required version

**URL:** https://discourse.itk.org/t/itk-pip-package-fails-to-install-required-version/1606
**Category:** Engineering
**Tags:** python
**Created:** [February 16, 2019, 6:36pm UTC](https://discourse.itk.org/t/itk-pip-package-fails-to-install-required-version/1606 "2019-02-16T18:36:20Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![finetjul](https://discourse.itk.org/user_avatar/discourse.itk.org/finetjul/32/538_2.png) [@finetjul](https://discourse.itk.org/u/finetjul)
#### Post date: [February 16, 2019, 6:36pm UTC](https://discourse.itk.org/t/itk-pip-package-fails-to-install-required-version/1606/1 "2019-02-16T18:36:20Z")

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Hi,

When requiring a specific itk version, (using pip install itk==5.0b1), all the itk sub packages are installed to their latest versions (itk 5.0rc1 as of today). See as follow:

> pip install itk==5.0b1

```
    Collecting itk==5.0b1
      Using cached https://files.pythonhosted.org/packages/7f/73/862c2e85bc501ffce7e7644dd2d0a05e36676876fbd73a167e712bf4b8f0/itk-5.0b1-cp35-cp35m-win_amd64.whl
    Collecting itk-segmentation>=5.0b1 (from itk==5.0b1)
      Downloading https://files.pythonhosted.org/packages/a0/a9/8aea2b7c3751a6738a56772c6f76b03f6686abdb71f3f453dfb604b9bf70/itk_segmentation-5.0rc1-cp35-cp35m-win_amd64.whl (3.9MB)
        100% |3.9MB 1.8MB/s
    Collecting numpy (from itk==5.0b1)
      Using cached https://files.pythonhosted.org/packages/2d/96/dc231b4bcd8781c16102e3deb5c857a39115917fe5abb8b137a36e453637/numpy-1.16.1-cp35-cp35m-win_amd64.whl
    Collecting itk-io>=5.0b1 (from itk==5.0b1)
      Downloading https://files.pythonhosted.org/packages/06/e1/1918525d4f4a71dde14bb00cd4db5b6c8b6bf030f0400de9567486fd0436/itk_io-5.0rc1-cp35-cp35m-win_amd64.whl (6.1MB)
        100% | 6.1MB 1.0MB/s
    Collecting itk-core>=5.0b1 (from itk==5.0b1)
      Downloading https://files.pythonhosted.org/packages/97/25/ef30f14d0687a32f9db56367f7abae2145a2dcc24604ef9a5c0417b8f549/itk_core-5.0rc1-cp35-cp35m-win_amd64.whl (25.5MB)

```

The only way I found to install a specific version of itk is to do the following:

```
pip uninstall itk itk-core itk-numerics itk-filtering itk-io itk-segmentation itk-registration itk-vtkglue vtk
pip install itk-core==5.0b1 itk-numerics==5.0b1 itk-filtering==5.0b1 itk-io==5.0b1 itk-segmentation==5.0b1 itk-registration==5.0b1 --force-reinstall --no-cache-dir
pip install itk==5.0b1
pip install itk-vtkglue

```

Thanks,  
Julien.

---

<div class="post-metadata">

### Author: ![matt.mccormick](https://discourse.itk.org/user_avatar/discourse.itk.org/matt.mccormick/32/7_2.png) [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)
#### Post date: [February 17, 2019, 1:41am UTC](https://discourse.itk.org/t/itk-pip-package-fails-to-install-required-version/1606/2 "2019-02-17T01:41:49Z")

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Hi Julien,

Please review this patch, which will make the group wheels have a strict dependency in future versions:

[https://github.com/InsightSoftwareConsortium/ITKPythonPackage/pull/123](https://github.com/InsightSoftwareConsortium/ITKPythonPackage/pull/123)

Thanks,  
Matt

---

<div class="post-metadata">

### Author: ![finetjul](https://discourse.itk.org/user_avatar/discourse.itk.org/finetjul/32/538_2.png) [@finetjul](https://discourse.itk.org/u/finetjul)
#### Post date: [February 17, 2019, 1:17pm UTC](https://discourse.itk.org/t/itk-pip-package-fails-to-install-required-version/1606/3 "2019-02-17T13:17:24Z")

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Thanks Matt,

Julien.