diff --git a/HISTORY.md b/HISTORY.md
index e3e1f61..2c4dca5 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,4 +1,4 @@
-Unreleased
+3.9.0 / 2026-09-28
 ==================
 
 ### Upgrade note: new request header
diff --git a/lib/Version.php b/lib/Version.php
index c74361c..dce00e6 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -4,4 +4,4 @@
 
 global $SEGMENT_VERSION;
 
-$SEGMENT_VERSION = '3.8.2';
+$SEGMENT_VERSION = '3.9.0';