diff --git a/CHANGELOG.md b/CHANGELOG.md
index 110ede6..a6597d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,31 +6,49 @@ All notable changes to this code base will be documented in this file,
 in every released version.
 
 ### Version 1.6.x
+
 - Released: 20zz-yy-xx
 
+### Version 1.6.6
+
+- Released: 2019-06-07
+- Issues/Enhancements:
+  - Issue #81 #31 (PR #114) Remove use of pylab.poly_between
+  - Calm conditions
+  - Update CONTRIBUTORS.md and CONTRIBUTING.md
+  - PR #107 Code formatting with Black
+  - PR #104  Fix setup.py
+  - Autodeploy to PyPI using Travis
+  - PEP8
+
 ### Version 1.6.5
+
 - Released: 2018-08-30
 - Issues/Enhancements:
   - Issue #99. Fix scatter plot direction
 
 ### Version 1.6.4
+
 - Released: 2018-08-22
 - Issues/Enhancements:
   - Improve doc
 
 ### Version 1.6.3
+
 - Released: 2017-08-22
 - Issues/Enhancements:
   - Issue #69 (PR #70). Dual licensing
   - ...
 
 ### Version 1.6.2
+
 - Released: 2017-08-02
 - Issues/Enhancements:
   - Issue #65 (PR #69). Fix inconsistent licence files
   - ...
 
 ### Version 1.6.1
+
 - Released: 2017-07-30
 - Maintainer: Sébastien Celles <s.celles@gmail.com>
 - Issues/Enhancements:
@@ -39,6 +57,7 @@ in every released version.
   - ...
 
 ### Version 1.5.0
+
 - Initial development: 2015-06-16
 - Co-Authors:
   - Sébastien Celles <s.celles@gmail.com>
@@ -59,5 +78,6 @@ in every released version.
   
 
 ### Version 1.4.0
+
 - Author: Lionel Roubeyrie <lionel.roubeyrie@gmail.com>
 - URL: http://youarealegend.blogspot.fr/search/label/windrose
diff --git a/release-procedure.md b/release-procedure.md
index 65e0d67..dc819cc 100644
--- a/release-procedure.md
+++ b/release-procedure.md
@@ -1,10 +1,18 @@
+# Release procedure
+
+## Python versions
+
 * Ensure supported Python versions in `setup.py` and `.travis.yml` are corrects 
 
 * Ensure windrose version is up to date in `version.py`
 
+## CHANGELOG
+
 * Ensure `CHANGELOG.md` have been updated
 
-*   Tag commit and push to github
+## Tag
+
+* Tag commit and push to github
 
 using Github website
 
@@ -13,7 +21,7 @@ tag: vx.x.x
 
 or using cli
 
-```
+```bash
 git tag -a x.x.x -m 'Version x.x.x'
 git push windrose master --tags
 ```
@@ -24,9 +32,18 @@ Go to https://zenodo.org/account/settings/github/repository/python-windrose/wind
 
 to ensure that new release have a DOI
 
-*  Upload to PyPI
+## Upload to PyPI
+
+### Automatic PyPI upload
+
+PyPI deployment was set using https://docs.travis-ci.com/user/deployment/pypi/
+
+When tagging a new release on Github, package should be automatically uploaded on PyPI.
+
+### Manual PyPI upload
 
 Ensure a `~/.pypirc` exists
+
 ```
 [distutils] # this tells distutils what package indexes you can push to
 index-servers = pypi
@@ -47,7 +64,7 @@ python setup.py register sdist bdist_wheel --universal
 python setup.py sdist bdist_wheel upload
 ```
 
-* Verify on PyPI
+## Verify on PyPI
 
 Go to https://pypi.python.org/pypi/windrose/
 or https://pypi.python.org/pypi?%3Aaction=pkg_edit&name=windrose
diff --git a/windrose/version.py b/windrose/version.py
index c48421f..7691370 100644
--- a/windrose/version.py
+++ b/windrose/version.py
@@ -1,7 +1,7 @@
 __author__ = "Lionel Roubeyrie"
 __credits__ = ["Sebastien Celles"]
 __email__ = "s.celles@gmail.com"
-__version__ = "1.6.5"
+__version__ = "1.6.6"
 __license__ = "CeCILL-B OR BSD-3-Clause"
 __url__ = "https://github.com/python-windrose/windrose"
 __maintainer__ = "Sebastien Celles"