diff --git a/DESCRIPTION b/DESCRIPTION
index 516f3b56..94532e3d 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: rsofun
 Title: The P-Model and BiomeE Modelling Framework
-Version: 5.1.0
+Version: 5.0.0.9000
 Authors@R: c(
             person(
               family = "Stocker",
diff --git a/NEWS.md b/NEWS.md
index f1c328fe..1463a91d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# rsofun v5.1.0
+# rsofun (development version v5.1.0)
 
 * new BiomeE behavior to recycle last year of forcing if requested simulation time span (`nyeartrend`) is longer than 
 available forcing data