diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index a2b8fc23..fe7776d2 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -7,8 +7,8 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
-Development version
--------------------
+4.21.0
+------
 - Improve ``Dependency`` provider error message: when dependency is undefined,
   error message contains its name.
 
diff --git a/src/dependency_injector/__init__.py b/src/dependency_injector/__init__.py
index a65eb103..ab964816 100644
--- a/src/dependency_injector/__init__.py
+++ b/src/dependency_injector/__init__.py
@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.20.2'
+__version__ = '4.21.0'
 """Version number.
 
 :type: str