diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a62bad..7e701dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All significant changes to this project will be documented here.
 
 ## [Unreleased]
 
+## [1.6]
+
+Release date: 2022-12-21
+
 *   Add support for Python 3.10.
 
 ## [1.5]
@@ -58,7 +62,8 @@ Release date: 2019-07-18
 
 *   Initial release.
 
-[Unreleased]: https://github.com/deepmind/dm_env/compare/v1.5...HEAD
+[Unreleased]: https://github.com/deepmind/dm_env/compare/v1.6...HEAD
+[1.6]: https://github.com/deepmind/dm_env/compare/v1.5...v1.6
 [1.5]: https://github.com/deepmind/dm_env/compare/v1.4...v1.5
 [1.4]: https://github.com/deepmind/dm_env/compare/v1.3...v1.4
 [1.3]: https://github.com/deepmind/dm_env/compare/v1.2...v1.3
diff --git a/dm_env/_metadata.py b/dm_env/_metadata.py
index a0d23fd..5ce4941 100644
--- a/dm_env/_metadata.py
+++ b/dm_env/_metadata.py
@@ -19,4 +19,4 @@
 a time when dm_env's dependencies may not have been installed yet.
 """
 
-__version__ = '1.5'  # https://www.python.org/dev/peps/pep-0440/
+__version__ = '1.6'  # https://www.python.org/dev/peps/pep-0440/
diff --git a/requirements.txt b/requirements.txt
index dfaf2b1..c5a660b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 absl-py==1.0.0
 dm-tree==0.1.6
-numpy==1.21.4
+numpy==1.21.6; python_version < '3.8'
+numpy==1.22.0; python_version >= '3.8'
 pytest==6.2.5