diff --git a/lua/peter/plugins/core/treesitter.lua b/lua/peter/plugins/core/treesitter.lua
index f01db52..af232a8 100644
--- a/lua/peter/plugins/core/treesitter.lua
+++ b/lua/peter/plugins/core/treesitter.lua
@@ -40,12 +40,11 @@ return {
     ---@param opts peter.treesitter.Config
     config = function(_, opts)
       local nts = require("nvim-treesitter")
-      local list = require("peter.util.list")
       local autocmds = require("peter.util.autocmds")
 
       nts.setup(opts --[[@as TSConfig]])
 
-      local ensure_installed = list.uniq(opts.ensure_installed or {})
+      local ensure_installed = vim.list.unique(opts.ensure_installed or {})
 
       local already_installed = nts.get_installed()
 
diff --git a/lua/peter/plugins/lsp/mason.lua b/lua/peter/plugins/lsp/mason.lua
index d60e073..2d112ed 100644
--- a/lua/peter/plugins/lsp/mason.lua
+++ b/lua/peter/plugins/lsp/mason.lua
@@ -42,8 +42,7 @@ return {
 
     ---@param opts peter.mason.Opts
     config = function(_, opts)
-      local list = require("peter.util.list")
-      opts.ensure_installed = list.uniq(opts.ensure_installed or {})
+      opts.ensure_installed = vim.list.unique(opts.ensure_installed or {})
 
       require("mason").setup(opts --[[@as MasonSettings]])
 
diff --git a/lua/peter/util/list.lua b/lua/peter/util/list.lua
index 698768f..76f3607 100644
--- a/lua/peter/util/list.lua
+++ b/lua/peter/util/list.lua
@@ -7,21 +7,18 @@ local M = {}
 --
 --[[ ---------------------------------------------------------------------- ]]
 
----Remove duplicate elements from a list.
----@param list any[] List to remove duplicates from.
----@return any[] new_list List with duplicates removed.
-function M.uniq(list)
-  local hash = {}
-  local ret = {}
-
-  for _, v in ipairs(list) do
-    if not hash[v] then
-      ret[#ret + 1] = v
-      hash[v] = true
-    end
-  end
-
-  return ret
+---Removes duplicate values from a list-like table without modifying the original
+---table.
+---
+---The input table is not modified. A new table is created by this function.
+---
+---For in-place deduplication, see `:h vim.list.unique`.
+---
+---@generic T
+---@param t T[]
+---@return T[] t A new, deduplicated list.
+function M.uniq_copy(t)
+  return vim.list.unique(vim.deepcopy(t))
 end
 
 return M