diff --git a/README.md b/README.md
index 04e82fe..9a9d61a 100644
--- a/README.md
+++ b/README.md
@@ -142,4 +142,16 @@ from the same source, in different formats:
 
 
 # Building and releasing new versions
-TODO
\ No newline at end of file
+
+* Update the package version in setup.py to the new version you are releasing (for example, 0.66).   
+* In the GitHub repository, navigate to Releases: 
+    * From the repository home page, select Releases from the right-hand panel, or
+    * Open the repository's Releases page directly by appending /releases to the repository URL.
+* Select Draft a new release.
+* Under Choose a tag, select Create new tag and enter the new version number (e.g. 0.66).
+* Enter a release title (e.g. v0.66) and add any relevant release notes.
+* Ensure the release is marked as Latest release.
+* Click Publish release.
+* Once published,the GitHub Actions will automatically publish the package to PyPI.
+* Wait for the GitHub Actions workflow to complete and verify that the new version is available on PyPI (https://pypi.org/).
+
diff --git a/setup.py b/setup.py
index c32d788..c3c9d7b 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='mario-pipeline-tools',
-    version='0.65',
+    version='0.66',
     packages=['mario'],
     url='https://github.com/JiscDACT/mario',
     license='all rights reserved',