diff --git a/CHANGES.md b/CHANGES.md
index e5efa0f..94a52e0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,22 @@
 LibCYAML: Change Log
 ====================
 
+## LibCYAML v1.4.0
+
+* **Loading**:
+  * Reject numerical values with trailing junk.
+  * New `CYAML_CFG_IGNORED_KEY_WARNING` to generate warnings when mapping
+    keys are ignored either explicitly by the `CYAML_IGNORE` type or implicitly
+    by the `CYAML_CFG_IGNORE_UNKNOWN_KEYS` config setting.
+* **Buildsystem**:
+  * Avoid using GNU `-D` install flag.
+* **General**:
+  * Improved API documentation for `CYAML_SEQUENCE_FIXED`.
+  * Minor optimisation for host endian detection for older GCCs.
+  * Minor CI updates.
+
+No changes are required for client applications to upgrade.
+
 ## LibCYAML v1.3.1
 
 * **Loading**:
diff --git a/Makefile b/Makefile
index e71cbae..5a1608c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,19 @@
 # SPDX-License-Identifier: ISC
 #
-# Copyright (C) 2017-2021 Michael Drake <tlsa@netsurf-browser.org>
+# Copyright (C) 2017-2023 Michael Drake <tlsa@netsurf-browser.org>
 
 # CYAML's versioning is <MAJOR>.<MINOR>.<PATCH>[-DEVEL]
-# Master branch will always be DEVEL.  The release process will be to make
-# the release branch, set VESION_DEVEL to 0, and tag the release.
+# The main branch will usually be DEVEL.  The release process is:
+# 0. Create branch for release.
+# 1. Update the CHANGES.md file.
+# 2. Set MAJOR, MINOR, and PATCH versions appropriately for changes.
+# 3. Create PR, review, and merge to main.
+# 4. Set VESION_DEVEL to 0, commit to main.
+# 5. Tag the release: `git tag -a vN.N.N -m "libcyaml N.N.N"`
+# 6. Set VESION_DEVEL to 1, commit to main.
 VERSION_MAJOR = 1
-VERSION_MINOR = 3
-VERSION_PATCH = 1
+VERSION_MINOR = 4
+VERSION_PATCH = 0
 VERSION_DEVEL = 1
 VERSION_STR = $(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_PATCH)