diff --git a/DESCRIPTION b/DESCRIPTION
index 7f605cbf5..13937023b 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: mlr3pipelines
 Title: Preprocessing Operators and Pipelines for 'mlr3'
-Version: 0.5.1
+Version: 0.5.1-9000
 Authors@R:
     c(person(given = "Martin",
              family = "Binder",
diff --git a/NEWS.md b/NEWS.md
index 52df70c12..5de5bfe09 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,5 @@
+# mlr3pipelines 0.5.1-9000
+
 # mlr3pipelines 0.5.1
 
 * Changed the ID of `PipeOpFeatureUnion` used in `ppl("robustify")` and `ppl("stacking")`.