diff --git a/changelogs/.changes.yaml b/changelogs/.changes.yaml
index 102b723d5f..ef392dda80 100644
--- a/changelogs/.changes.yaml
+++ b/changelogs/.changes.yaml
@@ -487,3 +487,23 @@ releases:
     - win_say-fix.yaml
     - winrm_pexpect.yaml
     release_date: '2018-09-28'
+  2.6.6:
+    codename: Heartbreaker
+    fragments:
+    - 34863-rabbitmq_user_unpack_fix.yaml
+    - 44755-win_nssm_fixes.yaml
+    - 45921-os_router-ignores-enable_snat-no.yml
+    - 46049-route53-caa-ordering.txt
+    - 46245-systemd-fix-service-enable-logic.yaml
+    - 46322-docker_container-image-not-given.yaml
+    - 46594-docker_container-publish-all-ports.yml
+    - 46595-docker_container-expected_ports.yml
+    - azure-version.yaml
+    - blockinfile-bytes-fix.yaml
+    - callback_fixes.yml
+    - fix_flatten.yml
+    - free-strategy-include-var-tags.yaml
+    - lineinfile-insertbefore-index-out-of-range.yaml
+    - user-docs-underlying-tools.yaml
+    - v2.6.6_summary.yaml
+    release_date: '2018-10-19'
diff --git a/changelogs/CHANGELOG-v2.6.rst b/changelogs/CHANGELOG-v2.6.rst
index b5ed6bfb6f..2b80e3a04e 100644
--- a/changelogs/CHANGELOG-v2.6.rst
+++ b/changelogs/CHANGELOG-v2.6.rst
@@ -2,6 +2,45 @@
 Ansible 2.6 "Heartbreaker" Release Notes
 ========================================
 
+v2.6.6
+======
+
+Release Summary
+---------------
+
+| Release Date: 2018-10-19
+| `Porting Guide <https://docs.ansible.com/ansible/devel/porting_guides.html>`_
+
+
+Minor Changes
+-------------
+
+- win_nssm - Drop support of literal YAML dictionnary for ``app_parameters`` option. Use the ``key=value;`` string form instead
+
+Bugfixes
+--------
+
+- Ignore empty result of rabbitmqctl list_user_permissions.
+- In systemd module, fix check if a systemd+initd service is enabled - disabled in systemd means disabled
+- Update callbacks to use Ansible's JSON encoder to avoid known serialization issues
+- blockinfile - use bytes rather than a native string to prevent a stacktrace in Python 3 when writing to the file (https://github.com/ansible/ansible/issues/46237)
+- docker_container - ``publish_ports: all`` was not used correctly when checking idempotency.
+- docker_container - fix idempotency check for published_ports in some special cases.
+- docker_container - the behavior is improved in case ``image`` is not specified, but needed for (re-)creating the container.
+- dynamic includes - Use the copied and merged task for calculating task vars in the free strategy (https://github.com/ansible/ansible/issues/47024)
+- fix flatten to properly handle multiple lists in lists https://github.com/ansible/ansible/issues/46343
+- lineinfile - fix index out of range error when using insertbefore on a file with only one line (https://github.com/ansible/ansible/issues/46043)
+- os_router - ``enable_snat: no`` was ignored.
+- route53 - fix CAA record ordering for idempotency.
+- use proper module_util to get Ansible version for Azure requests
+- user - add documentation on what underlying tools are used on each platform (https://github.com/ansible/ansible/issues/44266)
+- win_nssm - Add missing space between parameters with ``app_parameters``
+- win_nssm - Correctly escape argument line when a parameter contains spaces, quotes or backslashes
+- win_nssm - Fix error when several services were given to the ``dependencies`` option
+- win_nssm - Fix extra space added in argument line with ``app_parameters`` or ``app_parameters_free_form`` when a parameter start by a dash and is followed by a period (https://github.com/ansible/ansible/issues/44079)
+- win_nssm - Fix service not started when ``state=started`` (https://github.com/ansible/ansible/issues/35442)
+- win_nssm - Fix several issues and idempotency problems (https://github.com/ansible/ansible/pull/44755)
+
 v2.6.5
 ======
 
diff --git a/changelogs/fragments/v2.6.6_summary.yaml b/changelogs/fragments/v2.6.6_summary.yaml
new file mode 100644
index 0000000000..ae12413e7e
--- /dev/null
+++ b/changelogs/fragments/v2.6.6_summary.yaml
@@ -0,0 +1,3 @@
+release_summary: |
+   | Release Date: 2018-10-19
+   | `Porting Guide <https://docs.ansible.com/ansible/devel/porting_guides.html>`_
diff --git a/lib/ansible/release.py b/lib/ansible/release.py
index 83e7535a71..ecfd96f4c6 100644
--- a/lib/ansible/release.py
+++ b/lib/ansible/release.py
@@ -19,6 +19,6 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-__version__ = '2.6.5.post0'
+__version__ = '2.6.6'
 __author__ = 'Ansible, Inc.'
 __codename__ = 'Heartbreaker'