diff --git a/.travis.yml b/.travis.yml
index 9993f92d..a4016034 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,6 +50,10 @@ jobs:
     env: TOXENV=py38
     install: pip install tox
     script: tox
+  - python: 3.9
+    env: TOXENV=py39
+    install: pip install tox
+    script: tox
   - python: pypy
     env: TOXENV=pypy
     install: pip install tox
diff --git a/README.rst b/README.rst
index 96179185..80f532af 100644
--- a/README.rst
+++ b/README.rst
@@ -38,11 +38,7 @@
 .. image:: https://api.travis-ci.com/ets-labs/python-dependency-injector.svg?branch=master
    :target: https://travis-ci.com/github/ets-labs/python-dependency-injector
    :alt: Build Status
-   
-.. image:: https://readthedocs.org/projects/python-dependency-injector/badge/?version=latest
-   :target: https://python-dependency-injector.ets-labs.org/
-   :alt: Docs Status
-   
+
 .. image:: https://coveralls.io/repos/github/ets-labs/python-dependency-injector/badge.svg?branch=master
    :target: https://coveralls.io/github/ets-labs/python-dependency-injector?branch=master
    :alt: Coverage Status
@@ -146,7 +142,7 @@ The package is available on the `PyPi`_::
 Documentation
 -------------
 
-The documentation is available on the `Read The Docs <https://python-dependency-injector.ets-labs.org/>`_
+The documentation is available `here <https://python-dependency-injector.ets-labs.org/>`_
 
 Examples
 --------
diff --git a/docs/index.rst b/docs/index.rst
index f4f01211..762bca32 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -54,10 +54,6 @@ Dependency Injector --- Dependency injection framework for Python
    :target: https://travis-ci.com/github/ets-labs/python-dependency-injector
    :alt: Build Status
 
-.. image:: https://readthedocs.org/projects/python-dependency-injector/badge/?version=latest
-   :target: https://python-dependency-injector.ets-labs.org/
-   :alt: Docs Status
-
 .. image:: https://coveralls.io/repos/github/ets-labs/python-dependency-injector/badge.svg?branch=master
    :target: https://coveralls.io/github/ets-labs/python-dependency-injector?branch=master
    :alt: Coverage Status
diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index a079226e..e2dd1954 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -7,6 +7,11 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+4.2.0
+-----
+- Add support of Python 3.9.
+- Update readme.
+
 4.1.8
 -----
 - Update asyncio daemon, single- and multi-container examples to use ``Resource`` provider.
diff --git a/setup.py b/setup.py
index 967b1bb4..43d6d5b6 100644
--- a/setup.py
+++ b/setup.py
@@ -98,6 +98,7 @@ setup(name='dependency-injector',
           'Programming Language :: Python :: 3.6',
           'Programming Language :: Python :: 3.7',
           'Programming Language :: Python :: 3.8',
+          'Programming Language :: Python :: 3.9',
           'Programming Language :: Python :: Implementation :: CPython',
           'Programming Language :: Python :: Implementation :: PyPy',
           'Framework :: AsyncIO',
diff --git a/src/dependency_injector/__init__.py b/src/dependency_injector/__init__.py
index 0561da83..8f599cdd 100644
--- a/src/dependency_injector/__init__.py
+++ b/src/dependency_injector/__init__.py
@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.1.8'
+__version__ = '4.2.0'
 """Version number.
 
 :type: str