diff --git a/CHANGES.txt b/CHANGES.txt
index 8ccce9c..609a92d 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,4 @@
-## unreleased
+## v0.4.0
 * Remove top-level module names, modules should be accessed via
   ExtUnix top-level module.
 * Import realpath from OCaml 4.13
diff --git a/Makefile b/Makefile
index b71845e..0d6c884 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ doc:
 test:
 	dune runtest
 
-VERSION=0.3.2
+VERSION=0.4.0
 NAME=ocaml-extunix-$(VERSION)
 
 release: