diff --git a/CHANGES.md b/CHANGES.md
index 51aeb22..0c3f992 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,6 @@
 # XRLint Change History
 
-## Version 0.4.0 (in development)
+## Version 0.4.0 (from 2025-01-27)
 
 - Fixed and enhanced core rule `time-coordinate`. `(#33)
 - New xcube rule `no-chunked-coords`. (#29)
diff --git a/xrlint/version.py b/xrlint/version.py
index 6c0fde8..5140fa1 100644
--- a/xrlint/version.py
+++ b/xrlint/version.py
@@ -1 +1 @@
-version = "0.4.0.dev0"
+version = "0.4.0"