diff --git a/codex-launcher-gui b/codex-launcher-gui
index d88de83..eea4b96 100755
--- a/codex-launcher-gui
+++ b/codex-launcher-gui
@@ -26,6 +26,15 @@ model_catalog_json = ""
 """
 
 CHANGELOG = [
+    ("3.9.0", "2026-05-24", [
+        "Multi-account rotation for OAuth providers (freebuff, Google, API keys)",
+        "Automatic failover: when one account hits rate limit, next is used",
+        "Freebuff: supports accounts[] array in credentials.json",
+        "Google OAuth: supports multiple token files (google-*-oauth-token-N.json)",
+        "API keys: comma-separated keys rotate on 429 errors",
+        "New /v1/accounts endpoint shows account pool status",
+        "Added x-freebuff-model and x-freebuff-instance-id headers",
+    ]),
     ("3.8.4", "2026-05-24", [
         "FIXED: Freebuff streaming — SSE events now reach Codex client",
         "Root cause: stream_buffered_events was never called for freebuff",
@@ -1706,7 +1715,7 @@ class LauncherWin(Gtk.Window):
         # header row
         hdr = Gtk.Box(spacing=8)
         vbox.pack_start(hdr, False, False, 0)
-        lbl = Gtk.Label(label="<b>Codex Launcher v3.8.4</b>")
+        lbl = Gtk.Label(label="<b>Codex Launcher v3.9.0</b>")
         lbl.set_use_markup(True)
         hdr.pack_start(lbl, False, False, 0)
         changelog_btn = Gtk.Button(label="Changelog")
@@ -3495,7 +3504,7 @@ class EditEndpointDialog(Gtk.Dialog):
                 auth_url = "https://freebuff.com/api/auth/cli/code"
                 body = json.dumps({"fingerprintId": fingerprint_id}).encode()
                 req = urllib.request.Request(auth_url, data=body,
-                    headers={"Content-Type": "application/json", "User-Agent": "codex-launcher/3.8.4"})
+                    headers={"Content-Type": "application/json", "User-Agent": "codex-launcher/3.9.0"})
                 resp = urllib.request.urlopen(req, timeout=30)
                 data = json.loads(resp.read())
                 login_url = data.get("loginUrl", "") or data.get("login_url", "")
@@ -3520,7 +3529,7 @@ class EditEndpointDialog(Gtk.Dialog):
                     time.sleep(2)
                     try:
                         poll_req = urllib.request.Request(poll_url,
-                            headers={"User-Agent": "codex-launcher/3.8.4"})
+                            headers={"User-Agent": "codex-launcher/3.9.0"})
                         poll_resp = urllib.request.urlopen(poll_req, timeout=10)
                         poll_data = json.loads(poll_resp.read())
                         user = poll_data.get("user")