diff --git a/DESCRIPTION b/DESCRIPTION
index 7655314..0b690fb 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: nanoparquet
 Title: Read and Write 'Parquet' Files
-Version: 0.4.1
+Version: 0.4.1.9000
 Authors@R: c(
     person("Gábor", "Csárdi", role = c("aut", "cre"), email = "csardi.gabor@gmail.com"),
     person("Hannes", "Mühleisen", role = c("aut", "cph"), comment = c(ORCID = "0000-0001-8552-0029")),
diff --git a/NEWS.md b/NEWS.md
index daf346b..8859c9a 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,5 @@
+# nanoparquet (development version)
+
 # nanoparquet 0.4.1
 
 * `write_parquet()` now correctly converts double `Date` columns