diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bd4785..50b4b72 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+# 0.13.4 - 2023-08-02
+
+- Add documentation about mat2 on OSX
+- Make use of python3.7 constructs to simplify code
+- Use moderner type annotations
+- Harden get_meta in archive.py against variants of CVE-2022-35410 
+- Improve MSOffice document support
+- Package the manpage on pypi 
+
 # 0.13.3 - 2023-02-23
 
 - Fix a decorator argument
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a252462..69146e7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -30,15 +30,16 @@ Since mat2 is written in Python3, please conform as much as possible to the
 1. Update the [changelog](https://0xacab.org/jvoisin/mat2/blob/master/CHANGELOG.md)
 2. Update the version in the [mat2](https://0xacab.org/jvoisin/mat2/blob/master/mat2) file
 3. Update the version in the [setup.py](https://0xacab.org/jvoisin/mat2/blob/master/setup.py) file
-4. Update the version and date in the [man page](https://0xacab.org/jvoisin/mat2/blob/master/doc/mat2.1)
-5. Commit the changelog, man page, mat2 and setup.py files
-6. Create a tag with `git tag -s $VERSION`
-7. Push the commit with `git push origin master`
-8. Push the tag with `git push --tags`
-9. Download the gitlab archive of the release
-10. Diff it against the local copy
-11. If there is no difference, sign the archive with `gpg --armor --detach-sign mat2-$VERSION.tar.xz`
-12. Upload the signature on Gitlab's [tag page](https://0xacab.org/jvoisin/mat2/tags) and add the changelog there
-13. Announce the release on the [mailing list](https://mailman.boum.org/listinfo/mat-dev)
-14. Sign'n'upload the new version on pypi with `python3 setup.py sdist bdist_wheel` then `twine upload -s dist/*`
-15. Do the secret release dance
+4. Update the version in the [pyproject.toml](https://0xacab.org/jvoisin/mat2/blob/master/yproject.toml) file
+5. Update the version and date in the [man page](https://0xacab.org/jvoisin/mat2/blob/master/doc/mat2.1)
+6. Commit the modified files
+7. Create a tag with `git tag -s $VERSION`
+8. Push the commit with `git push origin master`
+9. Push the tag with `git push --tags`
+10. Download the gitlab archive of the release
+11. Diff it against the local copy
+12. If there is no difference, sign the archive with `gpg --armor --detach-sign mat2-$VERSION.tar.xz`
+13. Upload the signature on Gitlab's [tag page](https://0xacab.org/jvoisin/mat2/tags) and add the changelog there
+14. Announce the release on the [mailing list](https://mailman.boum.org/listinfo/mat-dev)
+15. Sign'n'upload the new version on pypi with `python3 setup.py sdist bdist_wheel` then `twine upload -s dist/*`
+16. Do the secret release dance
diff --git a/doc/mat2.1 b/doc/mat2.1
index 0b0e27c..9ed9ff4 100644
--- a/doc/mat2.1
+++ b/doc/mat2.1
@@ -1,4 +1,4 @@
-.TH mat2 "1" "February 2023" "mat2 0.13.3" "User Commands"
+.TH mat2 "1" "August 2023" "mat2 0.13.4" "User Commands"
 
 .SH NAME
 mat2 \- the metadata anonymisation toolkit 2
diff --git a/mat2 b/mat2
index 15b2fd2..e22512c 100755
--- a/mat2
+++ b/mat2
@@ -17,7 +17,7 @@ except ValueError as ex:
     print(ex)
     sys.exit(1)
 
-__version__ = '0.13.3'
+__version__ = '0.13.4'
 
 logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.WARNING)
 
diff --git a/pyproject.toml b/pyproject.toml
index 4956b85..02e510b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mat"
-version = "0.13.3"
+version = "0.13.4"
 readme = "README.md"
 requires-python = ">=3.9"
 
diff --git a/setup.py b/setup.py
index e99b852..356ca4b 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@ with open("README.md", encoding='utf-8') as fh:
 
 setuptools.setup(
     name="mat2",
-    version='0.13.3',
+    version='0.13.4',
     author="Julien (jvoisin) Voisin",
     author_email="julien.voisin+mat2@dustri.org",
     description="A handy tool to trash your metadata",