diff --git a/docs/source/coredev/index.rst b/docs/source/coredev/index.rst
index 60f1cb0..ee1eadb 100644
--- a/docs/source/coredev/index.rst
+++ b/docs/source/coredev/index.rst
@@ -80,6 +80,13 @@ for the release you are actually making::
     VERSION=5.0.0
     BRANCH=master
 
+For `reproducibility of builds <https://reproducible-builds.org/specs/source-date-epoch/>`_,
+we recommend setting ``SOURCE_DATE_EPOCH`` prior to running the build; record the used value
+of ``SOURCE_DATE_EPOCH`` as it may not be available from build artifact. You
+should be able to use ``date +%s`` to get a formatted timestamp::
+
+    SOURCE_DATE_EPOCH=$(date +%s)
+
 
 2. Create GitHub stats and finish release note
 ----------------------------------------------
@@ -229,6 +236,16 @@ uploading them to PyPI. We do not use an universal wheel as each wheel
 installs an ``ipython2`` or ``ipython3`` script, depending on the version of
 Python it is built for. Using an universal wheel would prevent this.
 
+Check the shasum of files with::
+
+    shasum -a 256 dist/*
+
+and takes notes of them you might need them to update the conda-forge recipes.
+Rerun the command and check the hash have not changed::
+
+    ./tools/release
+    shasum -a 256 dist/*
+
 Use the following to actually upload the result of the build::
 
     ./tools/release upload
diff --git a/docs/source/whatsnew/version7.rst b/docs/source/whatsnew/version7.rst
index f68c810..c35a465 100644
--- a/docs/source/whatsnew/version7.rst
+++ b/docs/source/whatsnew/version7.rst
@@ -2,6 +2,90 @@
  7.x Series
 ============
 
+.. _version 715:
+
+IPython 7.15
+============
+
+IPython 7.15 brings a number of bug fixes and user facing improvements.
+
+Misc Noticeable changes:
+------------------------
+
+ - Long completion name have better elision in terminal :ghpull:`12284`
+ - I've started to test on Python 3.9 :ghpull:`12307` and fix some errors.
+ - Hi DPI scaling of figures when using qt eventloop :ghpull:`12314`
+ - Document the ability to have systemwide configuration for IPython.
+   :ghpull:`12328`
+ - Fix issues with input autoformatting :ghpull:`12336`
+
+Reproducible Build
+------------------
+
+Starting with IPython 7.15, I am attempting to provide reproducible builds,
+that is to say you should be able from the source tree to generate an sdist
+and wheel that are identical byte for byte with the publish version on PyPI.
+
+I've only tested on a couple of machines so far and the process is relatively
+straightforward, so this mean that IPython not only have a deterministic build
+process, but also I have either removed, or put under control all effects of
+the build environments on the final artifact.  I encourage you to attempt the
+build process on your machine as documented in :ref:`core_developer_guide`
+and let me know if you do not obtain an identical artifact.
+
+While reproducible builds is critical to check that the supply chain of (open
+source) software has not been compromised, it can also help to speedup many
+of the build processes in large environment (conda, apt...) by allowing
+better caching of intermediate build steps.
+
+Learn more on `<https://reproducible-builds.org/>`_. `Reflections on trusting
+trust <https://dl.acm.org/doi/10.1145/358198.358210>`_ is also one of the
+cornerstone and recommended reads on this subject.
+
+.. note::
+
+   The build commit from which the sdist is generated is also `signed
+   <https://en.wikipedia.org/wiki/Digital_signature>`_, so you should be able to
+   check it has not been compromised, and the git repository is a `merkle-tree
+   <https://en.wikipedia.org/wiki/Merkle_tree>`_, you can check the consistency
+   with `git-fsck <https://git-scm.com/docs/git-fsck>`_ which you likely `want
+   to enable by default
+   <https://gist.github.com/mbbx6spp/14b86437e794bffb4120>`_.
+
+NEP29: Last version to support Python 3.6
+-----------------------------------------
+
+IPython 7.15 will be the Last IPython version to officially support Python
+3.6, as stated by `NumPy Enhancement Proposal 29
+<https://numpy.org/neps/nep-0029-deprecation_policy.html>`_. Starting with
+next minor version of IPython I may stop testing on Python 3.6 and may stop
+publishing release artifacts that install on Python 3.6
+
+Highlighted features
+--------------------
+
+Highlighted features are not new, but seem to not be widely known, this
+section will help you discover in more narrative form what you can do with
+IPython.
+
+Increase Tab Completion Menu Height
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In terminal IPython it is possible to increase the hight of the tab-completion
+menu. To do so set the value of
+:configtrait:`TerminalInteractiveShell.space_for_menu`, this will reserve more
+space at the bottom of the screen for various kind of menus in IPython including
+tab completion and searching in history. 
+
+Autoformat Code in the terminal
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you have a preferred code formatter, you can configure IPython to
+reformat your code. Set the value of
+:configtrait:`TerminalInteractiveShell.autoformatter` to for example ``'black'``
+and IPython will auto format your code when possible.
+
+
 .. _version 714:
 
 IPython 7.14
diff --git a/setup.py b/setup.py
index 593e3a6..daf5f55 100755
--- a/setup.py
+++ b/setup.py
@@ -225,7 +225,7 @@ everything = set()
 for key, deps in extras_require.items():
     if ':' not in key:
         everything.update(deps)
-extras_require['all'] = everything
+extras_require['all'] = list(sorted(everything))
 
 if 'setuptools' in sys.modules:
     setuptools_extra_args['python_requires'] = '>=3.6'
diff --git a/tools/build_release b/tools/build_release
index 26dc9ec..51fd87d 100755
--- a/tools/build_release
+++ b/tools/build_release
@@ -2,6 +2,7 @@
 """IPython release build script.
 """
 import os
+import sys
 from shutil import rmtree
 
 from toollib import sh, pjoin, get_ipdir, cd, sdists, buildwheels
@@ -12,15 +13,10 @@ def build_release():
     ipdir = get_ipdir()
     cd(ipdir)
 
-    # Cleanup
-    for d in ['build', 'dist', pjoin('docs', 'build'), pjoin('docs', 'dist'),
-              pjoin('docs', 'source', 'api', 'generated')]:
-        if os.path.isdir(d):
-            rmtree(d)
-
     # Build source and binary distros
     sh(sdists)
     buildwheels()
+    sh(' '.join([sys.executable, 'tools/retar.py', 'dist/*.gz']))
 
 if __name__ == '__main__':
     build_release()
diff --git a/tools/make_tarball.py b/tools/make_tarball.py
index bdce25b..fb639f6 100755
--- a/tools/make_tarball.py
+++ b/tools/make_tarball.py
@@ -3,7 +3,6 @@
 """
 
 import subprocess
-import os
 
 from toollib import cd, sh
 
diff --git a/tools/release b/tools/release
index 5c8686b..2de8e12 100755
--- a/tools/release
+++ b/tools/release
@@ -81,13 +81,10 @@ else:
     sh('mv ipython-*.tgz %s' % ipbackupdir)
 
     # Build release files
-    sh('./build_release %s' % ipdir)
+    sh('./build_release')
 
     cd(ipdir)
 
-    # Upload all files
-    sh(sdists)
-
     buildwheels()
     print("`./release upload` to upload source distribution on PyPI and ipython archive")
     sys.exit(0)
diff --git a/tools/release_helper.sh b/tools/release_helper.sh
index 7489c16..6e2e8bf 100644
--- a/tools/release_helper.sh
+++ b/tools/release_helper.sh
@@ -98,12 +98,6 @@ then
 
 fi
 
-echo
-echo $BLUE"Attempting to build package..."$NOR
-
-tools/build_release
-rm dist/*
-
 if ask_section "Should we commit, tag, push... etc ? "
 then
    echo
@@ -160,14 +154,41 @@ fi
 
 if ask_section "Should we build and release ?"
 then
+    
+    echo $BLUE"going to set SOURCE_DATE_EPOCH"$NOR
+    echo $BLUE'export SOURCE_DATE_EPOCH=$(git show -s --format=%ct HEAD)'$NOR
+    echo $GREEN"Press enter to continue"$NOR
+    read
+
+    export SOURCE_DATE_EPOCH=$(git show -s --format=%ct HEAD)
+
+    echo $BLUE"SOURCE_DATE_EPOCH set to $SOURCE_DATE_EPOCH"$NOR
+    echo $GREEN"Press enter to continue"$NOR
+    read
+
+
+
+    echo
+    echo $BLUE"Attempting to build package..."$NOR
+
+    tools/release
+
+
+    echo $RED'$ shasum -a 256 dist/*'
+    shasum -a 256 dist/*
+    echo $NOR
+
+    echo $BLUE"We are going to rebuild, node the hash above, and compare them to the rebuild"$NOR
+    echo $GREEN"Press enter to continue"$NOR
+    read
 
     echo
     echo $BLUE"Attempting to build package..."$NOR
 
     tools/release
 
-    echo $RED
-    echo '$ shasum -a 256 dist/*'
+    echo $RED"Check the shasum for SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH"
+    echo $RED'$ shasum -a 256 dist/*'
     shasum -a 256 dist/*
     echo $NOR
 
diff --git a/tools/retar.py b/tools/retar.py
new file mode 100644
index 0000000..dbdca0e
--- /dev/null
+++ b/tools/retar.py
@@ -0,0 +1,60 @@
+"""
+Un-targz and retargz a targz file to ensure reproducible build. 
+
+usage: 
+
+    $ export SOURCE_DATE_EPOCH=$(date +%s)
+    ...
+    $ python retar.py <tarfile.gz>
+
+The process of creating an sdist can be non-reproducible:
+  - directory created during the process get a mtime of the creation date; 
+  - gziping files embed the timestamp of fo zip creation. 
+
+This will untar-retar; ensuring that all mtime > SOURCE_DATE_EPOCH will be set
+equal to SOURCE_DATE_EPOCH.
+
+"""
+
+import tarfile
+import sys
+import os
+import gzip
+import io
+
+if len(sys.argv) > 2:
+    raise ValueError("Too many arguments")
+
+
+timestamp = int(os.environ["SOURCE_DATE_EPOCH"])
+
+old_buf = io.BytesIO()
+with open(sys.argv[1], "rb") as f:
+    old_buf.write(f.read())
+old_buf.seek(0)
+old = tarfile.open(fileobj=old_buf, mode="r:gz")
+
+buf = io.BytesIO()
+new = tarfile.open(fileobj=buf, mode="w", format=tarfile.GNU_FORMAT)
+for i, m in enumerate(old):
+    data = None
+    # mutation does not work, copy
+    if m.name.endswith('.DS_Store'):
+        continue
+    m2 = tarfile.TarInfo(m.name)
+    m2.mtime = min(timestamp, m.mtime)
+    m2.size = m.size
+    m2.type = m.type
+    m2.linkname = m.linkname
+    if m.isdir():
+        data = old.extractfile(m)
+        new.addfile(m2, data)
+    else:
+        new.addfile(m2)
+new.close()
+old.close()
+
+buf.seek(0)
+with open(sys.argv[1], "wb") as f:
+    with gzip.GzipFile('', "wb", fileobj=f, mtime=timestamp) as gzf:
+        gzf.write(buf.read())