diff --git a/init.el b/init.el
index f58463f..c1b0f17 100644
--- a/init.el
+++ b/init.el
@@ -1291,26 +1291,24 @@ DOCSTRING is an optional form that is discarded upon expansion."
   :custom
   (solaire-mode-real-buffer-fn (lambda ()
                                  (and (buffer-name (buffer-base-buffer))
-                                      (not (string-equal major-mode "neotree-mode"))
+                                      (not (derived-mode-p 'neotree-mode))
                                       (not (string-match "\*Echo Area" (buffer-name (buffer-base-buffer)))))))
   :hook
   (server-after-make-frame-hook . solaire-global-mode)
   (emacs-startup-hook . solaire-global-mode))
 
 ;; ---------------------------------- ;;
-;; undo-tree
+;; undo-fu-session
 ;; ---------------------------------- ;;
 
-(defconst user/undo-tree-directory (locate-user-emacs-file "undo-tree/") "Location of undo-tree backup directory.")
+(defconst user/undo-history-directory (locate-user-emacs-file "undo-history/") "Location of undo-fu-session history backups.")
 
-(external-package undo-tree
-  "Visualizes undo history as a tree in an interactive buffer"
+(external-package undo-fu-session
+  "Saves and recovers undo history of files between editing sessions"
   :config
-  (global-undo-tree-mode)
+  (global-undo-fu-session-mode)
   :custom
-  (undo-tree-enable-undo-in-region t "Enable undoing changes local to the active region.")
-  :custom
-  (undo-tree-history-directory-alist `(("." . ,user/undo-tree-directory))))
+  (undo-fu-session-directory user/undo-history-directory "Set custom undo history storage location"))
 
 ;; ---------------------------------- ;;
 ;; vertico
@@ -1334,6 +1332,20 @@ DOCSTRING is an optional form that is discarded upon expansion."
         ("\d" . vertico-directory-delete-char)
         ("\M-\d" . vertico-directory-delete-word)))
 
+;; ---------------------------------- ;;
+;; vundo
+;; ---------------------------------- ;;
+
+(external-package vundo
+  "Visualizes undo history as a tree in an interactive buffer"
+  :custom
+  (vundo-glyph-alist vundo-unicode-symbols "Visualize undo history with pretty unicode symbols")
+  :hook
+  (vundo-mode-hook . (lambda ()
+                       (setq-local global-hl-line-mode nil)))
+  :bind
+  ("C-x u" . vundo))
+
 ;; ---------------------------------- ;;
 ;; writeroom-mode
 ;; ---------------------------------- ;;