diff --git a/DESCRIPTION b/DESCRIPTION
index e9c4a4f..69b1564 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: treeshap
 Title: Compute SHAP Values for Your Tree-Based Models Using the 'TreeSHAP'
     Algorithm
-Version: 0.3.1
+Version: 0.3.1.9000
 Authors@R: c(
     person("Konrad", "Komisarczyk", email = "komisarczykkonrad@gmail.com", role = "aut"),
     person("Pawel", "Kozminski", email = "pkozminski99@gmail.com", role = "aut"),
diff --git a/NEWS.md b/NEWS.md
index bf84012..49ee37d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,5 @@
+# treeshap (development version)
+
 # treeshap 0.3.1 
 * Fixed code examples in `lightgbm.unify`.