diff --git a/docs/pages/project/changelog.md b/docs/pages/project/changelog.md
index 9d6c1dda..5f216751 100644
--- a/docs/pages/project/changelog.md
+++ b/docs/pages/project/changelog.md
@@ -9,6 +9,7 @@ Below are listed the changelogs for all released version of the library.
 
 ## Version 1
 
+- [`1.4.0` — 17th of April 2023](changelog/version-1.4.0.md)
 - [`1.3.1` — 13th of February 2023](changelog/version-1.3.1.md)
 - [`1.3.0` — 8th of February 2023](changelog/version-1.3.0.md)
 - [`1.2.0` — 9th of January 2023](changelog/version-1.2.0.md)
diff --git a/docs/pages/project/changelog/version-1.4.0.md b/docs/pages/project/changelog/version-1.4.0.md
new file mode 100644
index 00000000..0d6c2726
--- /dev/null
+++ b/docs/pages/project/changelog/version-1.4.0.md
@@ -0,0 +1,34 @@
+# Changelog 1.4.0 — 17th of April 2023
+
+!!! info inline end "[See release on GitHub]"
+    [See release on GitHub]: https://github.com/CuyZ/Valinor/releases/tag/1.4.0
+
+## Notable changes
+
+**Exception thrown when source is invalid**
+
+JSON or YAML given to a source may be invalid, in which case an exception can
+now be caught and manipulated.
+
+```php
+try {
+    $source = \CuyZ\Valinor\Mapper\Source\Source::json('invalid JSON');
+} catch (\CuyZ\Valinor\Mapper\Source\Exception\InvalidSource $error) {
+    // Let the application handle the exception in the desired way.
+    // It is possible to get the original source with `$error->source()`
+}
+```
+
+### Features
+
+* Introduce `InvalidSource` thrown when using invalid JSON/YAML ([0739d1](https://github.com/CuyZ/Valinor/commit/0739d128caa66817ab278bc849ed836fc041b88b))
+
+### Bug Fixes
+
+* Allow integer values in float types ([c6df24](https://github.com/CuyZ/Valinor/commit/c6df24da2bd1bb013ff0aee7c932983646fa4b0e))
+* Make `array-key` type match `mixed` ([ccebf7](https://github.com/CuyZ/Valinor/commit/ccebf78c997eb89caa9bb2b73e82b25d9710e6a3))
+* Prevent infinite loop when class has parent class with same name ([83eb05](https://github.com/CuyZ/Valinor/commit/83eb058478cc7dc162a77bb2800d2fbd1839639d))
+
+### Other
+
+* Add previous exception in various custom exceptions ([b9e381](https://github.com/CuyZ/Valinor/commit/b9e381604c90ac5531e1e7ae6b63b9abda36126e))