diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4ac174..094a594 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+1.21.1 (unreleased)
+
 1.21.0
 
 * Version numbering change. Future versions will be labled X.Y.Z where X is the major version, Y is the Aurora version the library has been tested against (e.g. 21 -> 0.21.0), and X is the minor revision.