diff --git a/DESCRIPTION b/DESCRIPTION
index ced8676..7690217 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: era
 Type: Package
 Title: Year-Based Time Scales
-Version: 0.3.1.9000
+Version: 0.4.0
 Authors@R: person("Joe", "Roe", email = "joe@joeroe.io",
   role = c("aut", "cre"), comment = c(ORCID = "0000-0002-1011-1244"))
 Description: Provides a consistent representation of year-based time scales as a
diff --git a/NEWS.md b/NEWS.md
index d1454e7..e288e3e 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# era (development version)
+# era 0.4.0
 
 * New eras:
   * Anno Mundi (Hebrew calendar)