diff --git a/CHANGELOG.md b/CHANGELOG.md
index dfbe93d..d460c21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,11 +6,15 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 Nothing for now.
 
-Compare with [last published version](https://github.com/meduzen/datetime-attribute/compare/1.3.3...main).
+Compare with [last published version](https://github.com/meduzen/datetime-attribute/compare/1.3.4...main).
+
+## v1.3.4 (2024-04-18)
+
+Compare with [previous version](https://github.com/meduzen/datetime-attribute/compare/1.3.3...1.3.4).
 
 ### Fixed
 
-- Fix incorrect year for `datetime(date, 'week')` when the week started the previous year. For example, `2021-01-01` is a Friday and its week belongs to 2020 (as [per spec](./README.md#weeknumber)). In that case, the output was `2021-53` instead of `2020-53`.
+- Fix incorrect year for `datetime(date, 'week')` when the week started the previous year. For example, `2021-01-01` is a Friday and its week belongs to 2020 (as [per spec](./README.md#weeknumber)). In that case, the output was `2021-W53` instead of `2020-W53`.
 
 ### Improved
 
@@ -18,6 +22,10 @@ Compare with [last published version](https://github.com/meduzen/datetime-attrib
   - for some signatures of optional parameters from `datetime(date?: Date | undefined` to `datetime(date?: Date`
   - for some optional properties from `{ w?: number | undefined }` to `{ w?: number }`
 
+### Documentation
+
+- Use brotli compression instead of gzip one to express the module size.
+
 ### Under the hood
 
 - Enforce type definitions for optional properties of the internal config functions `setConfig` and `setTzConfig`: it was possible to omit their `separator` property, it’s not anymore.
diff --git a/README.md b/README.md
index d447238..06cfb6f 100644
--- a/README.md
+++ b/README.md
@@ -3,16 +3,16 @@
 Get a [`datetime` attribute](https://developer.mozilla.org/en-US/docs/Web/API/HTMLTimeElement/datetime) for HTML `<time>` (and [other elements](#not-only-in-time)).
 
 It covers the [whole WHATWG specification](https://html.spec.whatwg.org/multipage/text-level-semantics.html#attr-time-datetime) in 4 functions:
-- [**`datetime()`**](#expressing-moments-with-datetime) for a specific moment ([645 B compressed](https://bundlejs.com/?q=datetime-attribute&treeshake=[{datetime}]&bundle));
-- [**`datetimeTz()`**](#adding-a-timezone-offset-to-a-moment-with-datetimetz) for a specific moment in a given timezone ([942 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{datetimeTz}]&bundle));
-- [**`duration()`**](#expressing-durations-with-duration) for a duration ([307 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{duration}]&bundle));
-- [**`tzOffset()`**](#expressing-timezone-offsets-with-tzoffset) for a timezone offset ([388 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{tzOffset}]&bundle)).
+- [**`datetime()`**](#expressing-moments-with-datetime) for a specific moment ([641 B compressed](https://bundlejs.com/?q=datetime-attribute&treeshake=[{datetime}]&config={"compression"%3A"brotli"}&bundle));
+- [**`datetimeTz()`**](#adding-a-timezone-offset-to-a-moment-with-datetimetz) for a specific moment in a given timezone ([903 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{datetimeTz}]&config={"compression"%3A"brotli"}&bundle));
+- [**`duration()`**](#expressing-durations-with-duration) for a duration ([284 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{duration}]&config={"compression"%3A"brotli"}&bundle));
+- [**`tzOffset()`**](#expressing-timezone-offsets-with-tzoffset) for a timezone offset ([332 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{tzOffset}]&config={"compression"%3A"brotli"}&bundle)).
 
-Additionally, a [`DateTime` class](#the-datetime-class) ([721 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{DateTime}]&bundle)) and some [other functions](#other-functions) are provided.
+Additionally, a [`DateTime` class](#the-datetime-class) ([710 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{DateTime}]&config={"compression"%3A"brotli"}&bundle)) and some [other functions](#other-functions) are provided.
 
 [![Node.js CI](https://github.com/meduzen/datetime-attribute/actions/workflows/node.js.yml/badge.svg)](https://github.com/meduzen/datetime-attribute/actions/workflows/node.js.yml)
 
-The package is lightweight ([~ 1.42 KB compressed](https://bundlejs.com/?q=datetime-attribute&bundle) for `import *`), tree-shakeable, typed and tested.
+The package is lightweight ([~ 1.37 KB compressed](https://bundlejs.com/?q=datetime-attribute&config={"compression"%3A"brotli"}&bundle) for `import *`), tree-shakeable, typed and tested.
 
 ## Table of contents
 
@@ -419,7 +419,7 @@ daysBetween(january1st2021, january11th) // 10
 daysBetween(january19th, january11th) // -8
 ```
 
-([134 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{daysBetween}]&bundle))
+([110 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{daysBetween}]&config={"compression"%3A"brotli"}&bundle))
 
 ### `weekNumber()`
 
@@ -442,7 +442,7 @@ weekNumber(january1st2021) // 53: it’s a Friday!
 weekNumber(january11th) // 2
 ```
 
-([201 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{weekNumber}]&bundle))
+([183 B](https://bundlejs.com/?q=datetime-attribute&treeshake=[{weekNumber}]&config={"compression"%3A"brotli"}&bundle))
 
 ## Changelog
 
diff --git a/package.json b/package.json
index fdda599..0fdf21d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "datetime-attribute",
-  "version": "1.3.3",
+  "version": "1.3.4",
   "description": "Generate datetime attributes for the <time> HTML element, following WHATWG and ISO8601 specs.",
   "type": "module",
   "sideEffects": false,