diff --git a/CHANGES.rst b/CHANGES.rst
index 6a98ae9..39bd6f7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog of fews-3di
 ===================================================
 
+3.9 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 3.8 (2024-12-16)
 ----------------
 
diff --git a/pyproject.toml b/pyproject.toml
index cfb3977..4476d6d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ requires = ["setuptools>=69"]
 [project]
 name = "fews-3di"
 requires-python = ">=3.8"
-version = "3.8"
+version = "3.9.dev0"
 dependencies = [
   "netCDF4",
   "pandas",