diff --git a/CHANGES.md b/CHANGES.md
index 852dc9c..4416910 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,9 @@
+# vob 4.0.0 (2026-07-16)
+
+* Move from (the unmaintained) `bincode` to `wincode`. The associated feature
+  name has also been renamed to `wincode`.
+
+
 # vob 3.0.6 (2025-08-14)
 
 * Transparently optimise `iter_{set|unset}_bits(...).count()` to use platform
diff --git a/Cargo.toml b/Cargo.toml
index 9dd522d..8a66489 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "vob"
 description = "Vector of Bits with Vec-like API and usize backing storage"
 repository = "https://github.com/softdevteam/vob/"
-version = "3.0.6"
+version = "4.0.0"
 authors = ["Laurence Tratt <laurie@tratt.net>"]
 readme = "README.md"
 license = "Apache-2.0/MIT"