diff --git a/CHANGELOG-3.x.md b/CHANGELOG-3.x.md
index 67a1975..46646e8 100644
--- a/CHANGELOG-3.x.md
+++ b/CHANGELOG-3.x.md
@@ -2,6 +2,15 @@
 
 This changelog references the relevant changes (bug and security fixes) done to `laravie/codex`.
 
+## 3.4.0
+
+Released: 2019-03-16
+
+### Changes
+
+* Add support for PSR-18 via `php-http/httplug` v2.0+.
+* Update recommended PHPUnit to `^7.5 || ^8.0`.
+
 ## 3.3.5
 
 Released: 2019-03-11