diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index b5b2b0dd..cc17bed0 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -16,6 +16,7 @@ Development version
 - Fix a few typos in docs (thanks to `Bruno P. Kinoshita <https://github.com/kinow>`_,
   `issue #249 <https://github.com/ets-labs/python-dependency-injector/issues/249>`_,
   `PR #250 <https://github.com/ets-labs/python-dependency-injector/pull/250>`_).
+- Add support of six 1.15.0.
 - Regenerate C sources using Cython 0.29.20.
 
 
diff --git a/requirements.txt b/requirements.txt
index c71dc73e..05a73847 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-six>=1.7.0,<=1.14.0
+six>=1.7.0,<=1.15.0