diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4831203a14..c3cd3559f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unreleased
+
 ## 0.65.0
 
 This release contains a mix of features and bugfixes.
diff --git a/version/version.go b/version/version.go
index d07db6bf1a..8f867587a3 100644
--- a/version/version.go
+++ b/version/version.go
@@ -11,7 +11,7 @@ import (
 )
 
 // Version is the canonical version of OPA.
-var Version = "0.65.0"
+var Version = "0.66.0-dev"
 
 // GoVersion is the version of Go this was built with
 var GoVersion = runtime.Version()