diff --git a/docs/about/release-notes.md b/docs/about/release-notes.md
index bcdd90aa..c8ab882f 100644
--- a/docs/about/release-notes.md
+++ b/docs/about/release-notes.md
@@ -14,9 +14,33 @@ You can determine your currently installed version using `properdocs --version`:
 
 ```console
 $ properdocs --version
-properdocs, version 1.6.6 from /path/to/properdocs (Python 3.13)
+properdocs, version 1.6.7 from /path/to/properdocs (Python 3.13)
 ```
 
+## Version 1.6.7 (2026-03-20)
+
+*   Fix: Do not skip anchor validation warnings when `--verbose` mode happens to be enabled (#57)
+
+*   Fix `mkdocs serve` crashing after the first reload if the config is passed from stdin (#56)
+
+*   Fix crashes when trying to parse invalid URLs (#55)
+
+*   Change the environment variable that is used to suppress the warning message when running through MkDocs. (#53)
+
+    The environment variable is now `DISABLE_MKDOCS_2_WARNING=true` instead of `NO_MKDOCS_2_WARNING=true`.
+
+    Apologies for the inconvenience. [A change in mkdocs-material](https://github.com/squidfunk/mkdocs-material/commit/51d9b76636431814df924bcda27485b16023978b) made this environment variable unusable - it's always set and there's no reasonable way to detect whether it was actually set on the command line, so we are forced to use a different environment variable now.
+
+*   Eliminate dependency on 'mergedeep' (unmaintained) - no change in functionality (#48)
+
+See [commit log](https://github.com/properdocs/properdocs/compare/v1.6.6...v1.6.7).
+
+### `properdocs-theme-mkdocs` 1.6.7
+
+*   Fix ability to toggle dark mode when `highlightjs: false` is set (#54)
+
+*   Fix the dropdown submenu marker being invisible (#58)
+
 ## Version 1.6.6 (2026-03-16)
 
 *   Add a warning in case there isn't any theme specified in the config (#39)
diff --git a/packages/properdocs-theme-mkdocs/properdocs_theme_mkdocs/__init__.py b/packages/properdocs-theme-mkdocs/properdocs_theme_mkdocs/__init__.py
index 008e8016..12ccbec3 100644
--- a/packages/properdocs-theme-mkdocs/properdocs_theme_mkdocs/__init__.py
+++ b/packages/properdocs-theme-mkdocs/properdocs_theme_mkdocs/__init__.py
@@ -1 +1 @@
-__version__ = '1.6.6'
+__version__ = '1.6.7'
diff --git a/packages/properdocs-theme-readthedocs/properdocs_theme_readthedocs/__init__.py b/packages/properdocs-theme-readthedocs/properdocs_theme_readthedocs/__init__.py
index 008e8016..12ccbec3 100644
--- a/packages/properdocs-theme-readthedocs/properdocs_theme_readthedocs/__init__.py
+++ b/packages/properdocs-theme-readthedocs/properdocs_theme_readthedocs/__init__.py
@@ -1 +1 @@
-__version__ = '1.6.6'
+__version__ = '1.6.7'
diff --git a/properdocs/__init__.py b/properdocs/__init__.py
index d8b21216..12ccbec3 100644
--- a/properdocs/__init__.py
+++ b/properdocs/__init__.py
@@ -1,5 +1 @@
-#!/usr/bin/env python
-
-
-# For acceptable version formats, see https://www.python.org/dev/peps/pep-0440/
-__version__ = '1.6.6'
+__version__ = '1.6.7'