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2022-11-16: Moving to
conda-forge is moving to producing
conda artifacts in the version 2 package
format (also known as
.conda). These artifacts allow for more efficient indexing
and maintenance of the ecosystem. Our admin migrations bot will begin making PRs to
feedstocks to change them over to the new artifact format. You will need
version 4.7 or later to use the new
.conda artifacts. Please leave a comment on
if you encounter problems or have feedback.
2022-11-04: Releasing Python 3.8.14, 3.9.14, and 3.10.7¶
The CPython versions 3.8.14, 3.9.14, and 3.10.7 were released some weeks ago to mitigate CVE-2020-10735.
The chosen mitigation strategy might cause errors (e.g.
ValueError: Exceeds the limit (4300) for integer string conversion) in some libraries.
If you are affected, please read the announcement
and learn about the available workarounds in the CPython documentation.
2022-09-27: Conda Moving to CalVer¶
Conda is moving to CalVer per CEP 8.
The first CalVer and last SemVer should be
4.14.0 respectively. This change
maintains version order so you should not expect any issues.
2022-08-24: Dropping Python 3.7¶
Conda-Forge has been providing support for Python 3.7 for 4 years now. Increasingly projects are moving off it (particularly in the PyData community). With Python 3.11’s release coming around the corner (October 3rd), conda-forge plans to drop Python 3.7 support when Python 3.11 comes out. This will lighten the load on conda-forge infrastructure and make room for the new versions the community would like to support.
More details can be found in issue conda-forge-pinning-feedstock#2623. Feedback is welcome there.
2022-08-17: Dropping PyPy 3.7¶
Conda-forge has supported PyPy since almost 2.5 years now, and the initial PyPy 3.7 builds have been superseded in almost all aspects by the newer builds for 3.8 & 3.9. We are therefore dropping PyPy 3.7 as a supported python version, and will keep focusing on the more contemporary PyPy builds.
2022-08-11: Moving to Visual Studio toolchain vc142¶
Microsoft has deprecated the Visual Studio (VS) 2017 compiler and removed it from all the CI they control (notably Azure Pipelines & Github Actions). This means that the default toolchain (== C/C++ compiler, linker, standard libraries, and related utilities) of that VS version - vc141 - is getting less and less use in upstream libraries (because public hosted CI doesn’t use it anymore by default), and therefore support for it is bitrotting at an accelerating pace. We are therefore planning to move our toolchain on windows to vc142 (the default in VS2019) in two weeks, on 2022-08-25.
This will not affect you as a general user of conda-forge packages on windows; the only impact is that if you are locally compiling against artefacts produced by conda-forge and are still using VS2017 yourself, you will need to upgrade your compiler (VS2019 is a drop-in replacement & ABI-compatible).
2022-07-22: Azure OSX VM Image Bumped to Version 11¶
Azure is removing their OSX 10.15 VM image and so we are bumping to 11. You will need to rerender your feedstock to get this change. Feedstocks without the new VM image specified will not build after Azure fully removes the old image. Please get in touch with us if you have issues or questions!
2022-04-23: Packages for Qt/PyQt 5.15.2 are now available¶
After more than six months, the conda-forge team and contributors have managed
to update the Qt5 packages to the latest LTS version, 5.15.2. Major changes include
separating the package for QtWebEngine (
qt-webengine) from the rest of Qt (now in a new
qt-main). This allows recipes that do not use any of the
WebEngine components to depend only on
qt-main, reducing the total size of
the downloaded binaries. As a result of this,
qt will be a metapackage that
qt-webengine as dependencies.
With respect to PyQt, the new packages now are in sync with respect to their
corresponding PyPI releases, which means that the
pyqt package will only provide
the core components of Qt, leaving
pyqtcharts as optional
packages that extend PyQt by providing the QtWebEngine and QtCharts components,
respectively. A migrator will be put in place to help with the transition.
2022-04-20: New Semi-automated PR Labeling in conda-forge/staged-recipes¶
A GitHub action now monitors comments on issues in staged-recipes and will add language and review labels to issues/PRs when a staged-recipes sub-team is mentioned in a comment. It adds the Awaiting author contribution label if a member of staged-recipes removes the review-requested label. Unlike notifications, which are only sent to the users which are members of a team at the time of the mention, labels are persistent and visible to everyone, so they should be very helpful for identifying old PRs that need attention.
2022-04-03: CircleCI and Drone.io Deprecated for New Feedstocks¶
Due to technical issues in generating new feedstocks, we have deprecated using CircleCI and Drone.io for builds of new feedstocks. Existing CircleCI builds, if any, should be moved to azure. Existing Drone.io builds can be moved to Travis CI or cross-compiled/emulated builds on azure.
2022-03-28: PyPy 3.8+3.9 Migration¶
We have begun rolling out packages built for PyPy3.8 and PyPy3.9. This work may take a few weeks. See Using PyPy as an interpreter in the user docs for information on how to set up a PyPy environment. Please report issues to the PyPy developers at https://foss.heptapod.net/pypy/pypy/issues. We are also dropping PyPy3.7 in each feedstock as the newer versions of PyPy are added. New versions of migrated feedstocks will not be built for PyPy3.7 and that version of the python interpreter will not be receiving updates. As usual, you can track the status of the migration on our status page.
2022-03-06: Travis CI Usage Deprecated for
Due to changes in how Travis CI tracks open-source build time, we are deprecating using it
linux_64 platforms. Travis CI will be available only
for platforms in their partner queues.
These platforms currently include
s390x. Rerendering will
raise an error if Travis CI is used for a non-partner queue platform in the
2022-02-13: Default branch migration from
We will be migrating the default branches of all feedstocks and other
main. We do expect some minor hiccups while this migration is
going on. You will need to change to the
main branch from
master on any local clones via the
following git commands:
git branch -m master main git fetch origin git branch -u origin/main main git remote set-head origin -a
If you encounter any problems, please comment on this Github issue.
2021-12-02: CentOS 7 docker images are now the default¶
We are moving all
linux-64 jobs to use CentOS 7-based docker images.
This will help users avoid
conda/mamba solver errors where dependencies that need
CentOS 7 cannot be installed. Importantly, our compiler stack will still default to using
a CentOS 6 sysroot unless the recipe explicitly lists the CentoOS 7 sysroot package. This
build configuration means that our core system ABI on linux will remain largely CentOS 6-compatible,
keeping support for older systems largely intact. We will reconsider moving the default ABI to
CentOS 7 at a later date.
cloud.drone.io no longer working¶
cloud.drone.io service we use for
aarch64 builds is no longer accepting our API
requests for triggering builds. We have been in contact with them, but have been unable to
resolve the issue. Going forward, we will still be adding feedstocks to
we have moved all
aarch64 builds to emulated builds on
Azure. Cross-compilers are
available as well for resource-intensive builds. Please rerender your feedstock as needed to
get the updated configuration.
2021-10-20: conda-forge now uses mambabuild as default¶
2021-10-13: GCC 10 and clang 12 as default compilers for Linux and macOS¶
These compilers will become the default for building packages in conda-forge. One notable change in gcc 10 is that the -fopenmp flag in FFLAGS is dropped. In clang 12, -std=c++14 explicit flag has been dropped from CXXFLAGS, as it is the default compilation mode for clang 12. In gcc 11, the default is -std=gnu++17. In clang>=12 and gcc>=11, we will not provide an explicit C++ standard, and will defer to the compiler default.
2021-10-04: python 3.6 is now dropped when building conda-forge packages¶
Python 3.6 is end-of-life in December 2021 and we are dropping support for it early to avoid having to rebuild packages as part of python 3.10 migration as that would save lots of CI resources.
defaults channel is now dropped when building conda-forge packages¶
You can get the previous behaviour by using the
channel_sources setting in
conda-forge is now citable!¶
You can now cite
conda-forge using our Zenodo entry!
This entry credits the entire
conda-forge community for its hard work in building our
2020-12-16: Moving to CentOS 7 and CentOS 6 End-of-Life¶
conda-forge’s compiler stack uses repackaged libraries from CentOS 6
to supply certain libraries, notably
glibc when building recipes. We currently
default to using CentOS 6 with the
glibc 2.12 ABI. However, CentOS 6 reached
end-of-life in November 2020 and increasingly software packages require at
least CentOS 7 with the
glibc 2.17 ABI. We also realize that due to recent
events, some communities that may have been planning to skip CentOS 7
and move straight to CentOS 8 might be reconsidering those plans. Further, they
may not be ready for a full-scale switch to CentOS 7. Thus the
conda-forge core team has decided to delay moving to CentOS 7 until sometime
early next year, likely the end of January 2021 at the earliest. We are actively
looking for feedback from our users on this issue. Please do get in touch
if you have comments or concerns!
2020-12-02: Artifact Validation¶
In an effort to better secure
conda-forge, we are developing a process to
validate artifacts before they are uploaded to
anaconda.org. This validation
will look for various security-related items, such as artifacts that overwrite
key pieces of certain packages. While this process is in development, we will not
be rejecting uploads. However, we will start scanning our current artifacts and
working with the maintainers of those artifacts to mark broken any which we deem
a security risk. We will also be running validation on new artifacts being upload
and will report any issues back to feedstocks. At a future date, artifacts that
do not pass validation will not be uploaded.
2020-10-08: Compiler Upgrade to
We will be upgrading all
GCC-based compilers to version
9.3.0 on all platforms. This upgrade will not affect
C++ code, but will require a rebuild of all feedstocks that use
FORTRAN due to a change in the
SONAME. During this rebuild,
we will keep the old compiler versions in production, temporarily
doubling the build matrix. Once the migration is deemed complete,
these old compiler versions will be removed.
2020-08-07: Completed New Staging Process for
We have now completed rolling out the new staging process for uploads
to anaconda.org. Direct uploads to the
conda-forge channel will no
longer work. If you are having trouble with package uploads, please
rerender your feedstock with the latest version of
As always, if you need help, bump us on Gitter or GitHub!
2020-08-06: Fixed Maintenance Process for Feedstock Teams¶
We have fixed a bug where the maintainers of feedstocks listed in the
meta.yaml did not match those listed in the GitHub team. Due to this
change, you may notice emails from GitHub informing you that you have been
removed from a GitHub team if you have recently removed yourself from a
feedstock via changing the
meta.yaml. A similar fix has been applied
for maintenance teams as well, though you will not see emails from this
2020-07-23: CentOS 7
sysroot Now Available for
We are very excited to announce that new compilers based on repackaged
sysroot’s from CentOS 7 are now available for all
These compilers will be the default going forward for any
gfortran versions past
linux-64 platform, we have also built the CentOS 6
and set it as the default, consistent with our current compilers. To use the
linux-64, add a requirement of
to the build section of your recipe. You also need to set the proper Docker
image in your
conda_build_config.yaml. See Using CentOS 7 for details.
2020-07-23: Strict channel priority in builds for OSX and Linux¶
We have changed the OSX and Linux platforms to enforce strict channel priority
in package builds. This change means that if a package is available in the
conda solver will not consider any versions of the package from other
channels. Users can disable this by setting
channel_priority: flexible in their
2020-07-23: NumPy 1.16 is the minimal NumPy version on all platforms¶
In accordance with NEP-29,
we have switched to have
numpy 1.16 as the minimum supported version on all
2020-07-17: Conda-forge is building openblas with both pthreads and openmp on Linux¶
The main change is that
openblas will use pthreads for threading by default on Linux
instead of the previous
openmp builds can be recovered by installing
2020-07-16: Core Dependency Tree Package Changes¶
conda-forge is moving to a new system for generating Core Dependency Tree (CDT)
packages. These changes include
CDT packages will no longer be built using feedstocks and this practice is officially deprecated.
Any current CDT packages in feedstocks will be moved to the new conda-forge/cdt-builds repo and the feedstock will be archived. Members of core will be doing this slowly on an as-needed basis, so it may not happen right away.
Requests for new CDTs should be submitted as PRs to the conda-forge/cdt-builds repo.
These changes are being made so that
conda-forge can provide access to
CentOS 7 / glibc 2.17 for
linux-64 builds. They will also move more of the
packages needed for
conda-forge builds into the
conda-forge channels making
builds more reliable.
2020-07-16: Moving from clang 9 to clang 10¶
conda-forge is moving to clang 10 on macOS! Check the release notes for what is new, breaking, or deprecated.
CFEP-18: Removing static libraries from the main build¶
we now have a policy on how to deal with static packages. The most important
change here is that we will be removing static libraries from the main packages
and moving them to
-static suffixed packages.
-static packages will not
be built by default but only on request.
cf-mark-broken renamed to
cf-mark-broken repo has been renamed to
admin-requests. It still
serves the same purpose. However, we have expanded the capabilities of the repo
to be able to mark packages as not broken.
2020-05-28: New Process for Marking Packages as Broken¶
We are changing the way we mark packages as
better match the
defaults channel and to better enable
reproducible environments that depended on broken packages.
We will now be adding the
broken label to packages but leaving
them on the
main channel. In order to make sure they do not
appear in the
repodata.json for the
main channel, we will
be patching the repo data to remove them using the
Users will notice the following changes
The packages on
anaconda.orgwill now have both the
All requests to mark packages as broken must be sent to the
corecan no longer mark things as broken by hand since the repo data patching must be done as well.
The package metadata for broken packages may differ slightly from when they were on the
The only correct source of package metadata is now the
anaconda.org. Any other sources may be missing critical changes.
2020-05-09: New Staging Process for
Starting this week, we are changing the way we upload packages to
We will move from direct uploads to the
main channel to using a
staging organization/channel combined with a copy request from the staging channel to
the production channel. This new process will allow us to perform some validation on
the outputs of feedstocks before they are released.
What will you see as a feedstock maintainer?
Starting this week, the
admin-migrationsservice will be making commits to all feedstocks to provision them with the necessary configuration, API keys, and tokens.
Each feedstock will now be provisioned with a secret token. This token should not be shared or taken out of the CI services. It is used to identify the feedstock during the upload process.
admin-migrationsservice will be setting a new top-level key in the
conda_forge_output_validation: true. This key indicates to
conda-smithythat it should include the output validation calls in the feedstock CI scripts.
Currently open PRs will need to have this key added by hand and then rerendered.
When PRs are running the CI scripts, they will do some initial validation of the feedstock outputs. If this validation fails, the CI job will fail. Please see the CI logs for the error message which is printed after
Once a PR is merged to master, the copy from the staging channel to the production channel will happen automatically.
Should a copy request fail, you will get a notification via a comment on the commit to master.
As part of this process, uploads from
appveyorwill no longer be allowed unless there is a significant barrier to using
azure. We have recently upgraded the compiler infrastructure on
azureto support this change in policy.
Despite our extensive testing, we do not expect this change to be completely smooth, so please bear with us. As always, if you have any questions, concerns, or trouble, you can find us on Gitter or bump us directly on Github!
We are formally deprecating
vs2015 in two weeks on 2020-04-07 and will move to
vs2017. This change will enable us to support the usage of
msbuild on Azure for the
win platform and will provide additional support for
Most packages built with
vs2015 can be linked with
vs2017 toolchain (but not vice-versa).
An exception is static libraries compiled with whole program optimization (/GL flag) which may be
incompatible with the
vs2017 toolchain. These static libraries will need to be rebuilt
2020-03-23: Appveyor Deprecation¶
We are now starting to formally deprecate Appveyor in favor of Azure for builds on the
win platform. Note that we have not been adding appveyor to new feedstocks
for a while, so this is not a completely new change in policy. We will now, however, begin to
actively disable Appveyor builds on feedstocks not using it by turning off builds for
push events. Additionally, we have been issuing PRs to any remaining
feedstocks to move them to Azure. We are aware that some packages built with
cannot yet be moved to Azure and so are leaving Appveyor on for those feedstocks for
2020-03-21: Python 2.7 Admin Command Available¶
A webservices admin command is now available to add Python 2.7 back to
@conda-forge-admin add python 2.7 in the title on an
issue in your feedstock. The admin webservices bot will then issue a PR
adding back Python 2.7. Note that this PR will remove other Python builds
ppc64le builds. If you want to keep
those, merge the PR into a separate branch on your feedstock.
2020-03-18: Python 2.7 and
Python 2.7 is no longer supported by the upstream developers as of 2020-01-01. Conda-forge is thus deprecating its Python 2.7 support. Conda-forge will provide no ongoing support for Python 2.7 builds and any existing builds are provided on an “as-is” basis.
cf202003label has been applied to the
conda-forgechannel for those who need a reference to the package index with Python 2.7.
We are removing support for
vs2008on Windows in conjunction with the deprecation of Python 2.7, as it was only supported to build this version of Python.
We will provide an admin command that will add back Python 2.7 to any feedstock. Note that as stated above, we cannot provide support for any Python 2.7 builds generated with this admin command. Further, this admin command will only work on
2019-09-30: Clang 9.0.0 and gfortran 7.3.0 as default compilers in OSX¶
If you maintain a feedstock that requires a C/C++ compiler, no changes necessary. A rerender should be done next time the feedstock is updated to use the new compiler.
If you maintain a feedstock with a Fortran compiler, a PR to upgrade to gfortran 7.3.0 was already issued. If that PR was merged, there’s nothing to do. If not, contact core if you need help migrating.
2019-03-28: We overhauled the blas support in conda-forge.¶
Our packages now build against NETLIB’s reference implementation.
You as a user can now choose the implementation available at runtime.
For more information please refer to the documentation.
2019-01-22: It has happened! Conda-forge has migrated to the latest compilers 🎉.¶
- If you:
maintain a compiled feedstock, it will likely need to be rerender
need to roll back to the old compilers, you can use the “cf201901” label
2018-10-12: The rebuild is moving along nicely with almost a third of the packages completed.¶
Recently completed are NumPy and Openblas which should open up much of the python numeric stack. We’re only about 5 feedstocks away from opening up all of R as well.
2018-09-24: A minimal python 3.7 build is now available across all platforms and both compilers!¶
2018-09-24: Deprecation notice for Python 3.5¶
As we start building out more of the Python 3.7 stack, we will no longer be building Python 3.5 packages.
No new python 3.5 packages will be built after 2018-10-01.
2018-09-20: The compiler migration is in full swing.¶
The bot will be making the rounds and modernizing more than 4000 packages. This is going to take a few months to get done so bear with us.
2018-09-10: Conda forge now has a magical status bar for tracking the progress of migrations.¶
You can find this at conda-forge.org/status.