diff --git a/lazy-lock.json b/lazy-lock.json
index ee8ee86..bb16445 100644
--- a/lazy-lock.json
+++ b/lazy-lock.json
@@ -1,39 +1,31 @@
 {
-  "LuaSnip": { "branch": "master", "commit": "0f7bbce41ea152a94d12aea286f2ce98e63c0f58" },
+  "LuaSnip": { "branch": "master", "commit": "c9b9a22904c97d0eb69ccb9bab76037838326817" },
   "autoclose.nvim": { "branch": "main", "commit": "b2077aa2c83df7ebc19b2a20a3a0654b24ae9c8f" },
-  "cmp-nvim-lsp": { "branch": "main", "commit": "39e2eda76828d88b773cc27a3f61d2ad782c922d" },
+  "cmp-nvim-lsp": { "branch": "main", "commit": "99290b3ec1322070bcfb9e846450a46f6efa50f0" },
   "cmp-path": { "branch": "main", "commit": "91ff86cd9c29299a64f968ebb45846c485725f23" },
   "cmp_luasnip": { "branch": "master", "commit": "98d9cb5c2c38532bd9bdb481067b20fea8f32e90" },
-  "conform.nvim": { "branch": "master", "commit": "f1125f8eace158255cf55772ce039aaf178a6b42" },
-  "fidget.nvim": { "branch": "main", "commit": "e2a175c2abe2d4f65357da1c98c59a5cfb2b543f" },
-  "gitsigns.nvim": { "branch": "main", "commit": "ac5aba6dce8c06ea22bea2c9016f51a2dbf90dc7" },
-  "lazy.nvim": { "branch": "main", "commit": "56ead98e05bb37a4ec28930a54d836d033cf00f2" },
-  "lazydev.nvim": { "branch": "main", "commit": "d5800897d9180cea800023f2429bce0a94ed6064" },
-  "lua-async-await": { "branch": "main", "commit": "652d94df34e97abe2d4a689edbc4270e7ead1a98" },
-  "luvit-meta": { "branch": "main", "commit": "57d464c4acb5c2e66bd4145060f5dc9e96a7bbb7" },
-  "mason-lspconfig.nvim": { "branch": "main", "commit": "43894adcf10bb1190c2184bd7c1750e8ea2b3dce" },
+  "conform.nvim": { "branch": "master", "commit": "363243c03102a531a8203311d4f2ae704c620d9b" },
+  "fidget.nvim": { "branch": "main", "commit": "a0abbf18084b77d28bc70e24752e4f4fd54aea17" },
+  "gitsigns.nvim": { "branch": "main", "commit": "c6fedfd0b1715ee624384b134becec0a7b0a3d28" },
+  "lazy.nvim": { "branch": "main", "commit": "d8f26efd456190241afd1b0f5235fe6fdba13d4a" },
+  "lazydev.nvim": { "branch": "main", "commit": "a1b78b2ac6f978c72e76ea90ae92a94edf380cfc" },
+  "luvit-meta": { "branch": "main", "commit": "1df30b60b1b4aecfebc785aa98943db6c6989716" },
+  "mason-lspconfig.nvim": { "branch": "main", "commit": "e942edf5c85b6a2ab74059ea566cac5b3e1514a4" },
   "mason-tool-installer.nvim": { "branch": "main", "commit": "c5e07b8ff54187716334d585db34282e46fa2932" },
   "mason.nvim": { "branch": "main", "commit": "e2f7f9044ec30067bc11800a9e266664b88cda22" },
-  "mini.nvim": { "branch": "main", "commit": "6714e738555b1cfbef646a23af29aa113f91f4fe" },
-  "nui.nvim": { "branch": "main", "commit": "b58e2bfda5cea347c9d58b7f11cf3012c7b3953f" },
-  "nvim-cmp": { "branch": "main", "commit": "40a03dc225383c4f6256596c2cdf27e03b8119b5" },
-  "nvim-dap": { "branch": "master", "commit": "cc92b054720a96170eca6bd9bdedd43d2b0a7a8a" },
-  "nvim-java": { "branch": "main", "commit": "905013eb83c58bda992724b3ecbe20f60b58513f" },
-  "nvim-java-core": { "branch": "main", "commit": "5b03dca22fee76524a89e1c2dc1d73a9f0b1a3bb" },
-  "nvim-java-dap": { "branch": "main", "commit": "55f239532f7a3789d21ea68d1e795abc77484974" },
-  "nvim-java-refactor": { "branch": "main", "commit": "ea1420fed5463c9cc976c2b4175f434b3646f0f7" },
-  "nvim-java-test": { "branch": "main", "commit": "7f0f40e9c5b7eab5096d8bec6ac04251c6e81468" },
-  "nvim-lspconfig": { "branch": "master", "commit": "f012c1b176f0e3c71f40eb309bdec0316689462e" },
-  "nvim-tree.lua": { "branch": "master", "commit": "c7639482a1598f4756798df1b2d72f79fe5bb34f" },
-  "nvim-treesitter": { "branch": "master", "commit": "a3a732107f8b529f97bf4921b3e1af5dcc756bb6" },
-  "nvim-web-devicons": { "branch": "master", "commit": "e87554285f581047b1bf236794b0eb812b444b87" },
-  "plenary.nvim": { "branch": "master", "commit": "2d9b06177a975543726ce5c73fca176cedbffe9d" },
-  "spring-boot.nvim": { "branch": "main", "commit": "218c0c26c14d99feca778e4d13f5ec3e8b1b60f0" },
+  "mini.nvim": { "branch": "main", "commit": "12ebac8280869048c286d13bd35cfa6653e07642" },
+  "nvim-cmp": { "branch": "main", "commit": "12509903a5723a876abd65953109f926f4634c30" },
+  "nvim-lspconfig": { "branch": "master", "commit": "9962e25a23f0e992116b99a9a6400947d5a7177b" },
+  "nvim-tree.lua": { "branch": "master", "commit": "d529a99f88e0dff02e0aa275db2f595cd252a2c8" },
+  "nvim-treesitter": { "branch": "master", "commit": "13f4346876f394973ff676670304a2b734174538" },
+  "nvim-web-devicons": { "branch": "master", "commit": "1c9136332840edee0c593f2f4f89598c8ed97f5f" },
+  "plenary.nvim": { "branch": "master", "commit": "3707cdb1e43f5cea73afb6037e6494e7ce847a66" },
   "telescope-fzf-native.nvim": { "branch": "main", "commit": "cf48d4dfce44e0b9a2e19a008d6ec6ea6f01a83b" },
   "telescope-ui-select.nvim": { "branch": "master", "commit": "6e51d7da30bd139a6950adf2a47fda6df9fa06d2" },
   "telescope.nvim": { "branch": "0.1.x", "commit": "a0bbec21143c7bc5f8bb02e0005fa0b982edc026" },
-  "todo-comments.nvim": { "branch": "main", "commit": "ae0a2afb47cf7395dc400e5dc4e05274bf4fb9e0" },
-  "tokyonight.nvim": { "branch": "main", "commit": "c2725eb6d086c8c9624456d734bd365194660017" },
+  "todo-comments.nvim": { "branch": "main", "commit": "304a8d204ee787d2544d8bc23cd38d2f929e7cc5" },
+  "tokyonight.nvim": { "branch": "main", "commit": "8cb8b1aded4087712030ef3e840ad6468fbc7b0f" },
+  "undotree": { "branch": "main", "commit": "eab459ab87dd249617b5f7187bb69e614a083047" },
   "vim-sleuth": { "branch": "master", "commit": "be69bff86754b1aa5adcbb527d7fcd1635a84080" },
-  "which-key.nvim": { "branch": "main", "commit": "68e37e12913a66b60073906f5d3f14dee0de19f2" }
+  "which-key.nvim": { "branch": "main", "commit": "0e76a87ac51772569aec678dc74baa8e2a86100c" }
 }
diff --git a/lua/lorenz/init.lua b/lua/lorenz/init.lua
index 4893b53..35a7305 100644
--- a/lua/lorenz/init.lua
+++ b/lua/lorenz/init.lua
@@ -1,5 +1,5 @@
 require("lorenz.basic")
 require("lorenz.lazy")
-require("lorenz.tree")
+require("lorenz.nvimtree")
+require("lorenz.undotree")
 require("lorenz.autoclose")
-require("lorenz.kickstarter")
diff --git a/lua/lorenz/kickstarter.lua b/lua/lorenz/kickstarter.lua
deleted file mode 100644
index 205caf0..0000000
--- a/lua/lorenz/kickstarter.lua
+++ /dev/null
@@ -1,4 +0,0 @@
-
-
--- The line beneath this is called `modeline`. See `:help modeline`
--- vim: ts=2 sts=2 sw=2 et
diff --git a/lua/lorenz/lazy.lua b/lua/lorenz/lazy.lua
index fba132b..b332115 100644
--- a/lua/lorenz/lazy.lua
+++ b/lua/lorenz/lazy.lua
@@ -12,6 +12,12 @@ vim.opt.rtp:prepend(lazypath)
 
 require("lazy").setup({
 
+	{
+		"jiaoshijie/undotree",
+		dependencies = "nvim-lua/plenary.nvim",
+		config = true,
+	},
+
 	"m4xshen/autoclose.nvim",
 
 	{
diff --git a/lua/lorenz/tree.lua b/lua/lorenz/nvimtree.lua
similarity index 100%
rename from lua/lorenz/tree.lua
rename to lua/lorenz/nvimtree.lua
diff --git a/lua/lorenz/undotree.lua b/lua/lorenz/undotree.lua
new file mode 100644
index 0000000..a88288a
--- /dev/null
+++ b/lua/lorenz/undotree.lua
@@ -0,0 +1,23 @@
+local undotree = require("undotree")
+
+undotree.setup({
+	float_diff = true, -- using float window previews diff, set this `true` will disable layout option
+	layout = "left_bottom", -- "left_bottom", "left_left_bottom"
+	position = "left", -- "right", "bottom"
+	ignore_filetype = { "undotree", "undotreeDiff", "qf", "TelescopePrompt", "spectre_panel", "tsplayground" },
+	window = {
+		winblend = 0,
+	},
+	keymaps = {
+		["j"] = "move_next",
+		["k"] = "move_prev",
+		["gj"] = "move2parent",
+		["J"] = "move_change_next",
+		["K"] = "move_change_prev",
+		["<cr>"] = "action_enter",
+		["p"] = "enter_diffbuf",
+		["q"] = "quit",
+	},
+})
+
+vim.keymap.set("n", "<leader>u", require("undotree").toggle, { noremap = true, silent = true })