diff --git a/CHANGELOG.md b/CHANGELOG.md
index 37365ac..f20c201 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # Changelog
 
+## [unreleased]
+
 ## [0.21.0] - 2020-12-20
 
 ### Added
diff --git a/federation/__init__.py b/federation/__init__.py
index b929abf..efa8fe1 100644
--- a/federation/__init__.py
+++ b/federation/__init__.py
@@ -6,7 +6,7 @@ from federation.exceptions import NoSuitableProtocolFoundError
 if TYPE_CHECKING:
     from federation.types import RequestType
 
-__version__ = "0.21.0"
+__version__ = "0.22.0-dev"
 
 PROTOCOLS = (
     "activitypub",