diff --git a/DESCRIPTION b/DESCRIPTION
index 153b7339f..b97311513 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: vctrs
 Title: Vector Helpers
-Version: 0.6.4
+Version: 0.6.4.9000
 Authors@R: c(
     person("Hadley", "Wickham", , "hadley@posit.co", role = "aut"),
     person("Lionel", "Henry", , "lionel@posit.co", role = "aut"),
diff --git a/NEWS.md b/NEWS.md
index a9e0972e3..b68964db0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,5 @@
+# vctrs (development version)
+
 # vctrs 0.6.4
 
 * Fixed a performance issue with `vec_c()` and ALTREP vectors (in particular,
diff --git a/src/version.c b/src/version.c
index 0a0a80bdd..6580b4cdd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -1,7 +1,7 @@
 #define R_NO_REMAP
 #include <Rinternals.h>
 
-const char* vctrs_version = "0.6.4";
+const char* vctrs_version = "0.6.4.9000";
 
 /**
  * This file records the expected package version in the shared