diff --git a/DESCRIPTION b/DESCRIPTION
index 2bb58f1..a3199d3 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: warp
 Title: Group Dates
-Version: 0.2.1
+Version: 0.2.1.9000
 Authors@R: c(
     person("Davis", "Vaughan", , "davis@posit.co", role = c("aut", "cre")),
     person("Posit Software, PBC", role = c("cph", "fnd"))
diff --git a/NEWS.md b/NEWS.md
index fdb5c2d..49d6eca 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,5 @@
+# warp (development version)
+
 # warp 0.2.1
 
 * Fixed a test related to an R-devel bugfix in `as.POSIXlt()` (#36).