diff --git a/CHANGES.md b/CHANGES.md
index 325a4d71b..7e43ba1e0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,6 @@
+## Changes in 1.5.2 (in development)
+
+
 ## Changes in 1.5.1
 
 * Embedded [xcube-viewer 1.1.1](https://github.com/xcube-dev/xcube-viewer/releases/tag/v1.1.1).
diff --git a/xcube/version.py b/xcube/version.py
index e98b5abb0..fd7a7fa1d 100644
--- a/xcube/version.py
+++ b/xcube/version.py
@@ -2,4 +2,4 @@
 # Permissions are hereby granted under the terms of the MIT License:
 # https://opensource.org/licenses/MIT.
 
-version = "1.5.1"
+version = "1.5.2.dev0"