diff --git a/lua/lspconfig/configs.lua b/lua/lspconfig/configs.lua
index 4a13c1f61b..0d23dffc08 100644
--- a/lua/lspconfig/configs.lua
+++ b/lua/lspconfig/configs.lua
@@ -133,7 +133,7 @@ function configs.__newindex(t, config_name, config_def)
       async.run(function()
         local root_dir
         if type(get_root_dir) == 'function' then
-          root_dir = get_root_dir(util.path.sanitize(bufname), bufnr)
+          root_dir = get_root_dir(vim.fs.normalize(bufname), bufnr)
           async.reenter()
           if not api.nvim_buf_is_valid(bufnr) then
             return
@@ -162,7 +162,7 @@ function configs.__newindex(t, config_name, config_def)
           for _, buf in ipairs(api.nvim_list_bufs()) do
             local buf_name = api.nvim_buf_get_name(buf)
             if util.bufname_valid(buf_name) then
-              local buf_dir = util.path.sanitize(buf_name)
+              local buf_dir = vim.fs.normalize(buf_name)
               if buf_dir:sub(1, root_dir:len()) == root_dir then
                 M.manager:try_add_wrapper(buf, root_dir)
               end
@@ -176,7 +176,7 @@ function configs.__newindex(t, config_name, config_def)
           if not api.nvim_buf_is_valid(bufnr) or (#bufname ~= 0 and not util.bufname_valid(bufname)) then
             return
           end
-          local pseudo_root = #bufname == 0 and pwd or vim.fs.dirname(util.path.sanitize(bufname))
+          local pseudo_root = #bufname == 0 and pwd or vim.fs.dirname(vim.fs.normalize(bufname))
           M.manager:add(pseudo_root, true, bufnr, config.silent)
         end
       end)
diff --git a/lua/lspconfig/configs/lean3ls.lua b/lua/lspconfig/configs/lean3ls.lua
index 014798988c..645fbbbee5 100644
--- a/lua/lspconfig/configs/lean3ls.lua
+++ b/lua/lspconfig/configs/lean3ls.lua
@@ -6,7 +6,7 @@ return {
     filetypes = { 'lean3' },
     offset_encoding = 'utf-32',
     root_dir = function(fname)
-      fname = util.path.sanitize(fname)
+      fname = vim.fs.normalize(fname)
       -- check if inside elan stdlib
       local stdlib_dir
       do
diff --git a/lua/lspconfig/configs/leanls.lua b/lua/lspconfig/configs/leanls.lua
index cde899d99e..c29b641769 100644
--- a/lua/lspconfig/configs/leanls.lua
+++ b/lua/lspconfig/configs/leanls.lua
@@ -6,7 +6,7 @@ return {
     filetypes = { 'lean' },
     root_dir = function(fname)
       -- check if inside elan stdlib
-      fname = util.path.sanitize(fname)
+      fname = vim.fs.normalize(fname)
       local stdlib_dir
       do
         local _, endpos = fname:find '/src/lean'
diff --git a/lua/lspconfig/configs/relay_lsp.lua b/lua/lspconfig/configs/relay_lsp.lua
index 2c14efb605..9f2b3776b6 100644
--- a/lua/lspconfig/configs/relay_lsp.lua
+++ b/lua/lspconfig/configs/relay_lsp.lua
@@ -34,7 +34,7 @@ return {
       end
 
       if config.path_to_config then
-        config.path_to_config = util.path.sanitize(config.path_to_config)
+        config.path_to_config = vim.fs.normalize(config.path_to_config)
         local path_to_config = util.path.join(root_dir, config.path_to_config)
         if util.path.exists(path_to_config) then
           vim.list_extend(config.cmd, { config.path_to_config })
diff --git a/lua/lspconfig/configs/rust_analyzer.lua b/lua/lspconfig/configs/rust_analyzer.lua
index a8f11208ee..8bcde6c9b8 100644
--- a/lua/lspconfig/configs/rust_analyzer.lua
+++ b/lua/lspconfig/configs/rust_analyzer.lua
@@ -16,7 +16,7 @@ local function reload_workspace(bufnr)
 end
 
 local function is_library(fname)
-  local user_home = util.path.sanitize(vim.env.HOME)
+  local user_home = vim.fs.normalize(vim.env.HOME)
   local cargo_home = os.getenv 'CARGO_HOME' or util.path.join(user_home, '.cargo')
   local registry = util.path.join(cargo_home, 'registry', 'src')
   local git_registry = util.path.join(cargo_home, 'git', 'checkouts')
@@ -62,7 +62,7 @@ return {
         if result and result[1] then
           result = vim.json.decode(table.concat(result, ''))
           if result['workspace_root'] then
-            cargo_workspace_root = util.path.sanitize(result['workspace_root'])
+            cargo_workspace_root = vim.fs.normalize(result['workspace_root'])
           end
         end
       end
diff --git a/lua/lspconfig/manager.lua b/lua/lspconfig/manager.lua
index 45a9e4254f..16bf17c0f6 100644
--- a/lua/lspconfig/manager.lua
+++ b/lua/lspconfig/manager.lua
@@ -157,7 +157,7 @@ end
 ---@param bufnr integer
 ---@param silent boolean
 function M:add(root_dir, single_file, bufnr, silent)
-  root_dir = util.path.sanitize(root_dir)
+  root_dir = vim.fs.normalize(root_dir)
   local new_config = self.make_config(root_dir)
   self:_start_client(bufnr, new_config, root_dir, single_file, silent)
 end
@@ -199,7 +199,7 @@ function M:try_add(bufnr, project_root, silent)
     return
   end
 
-  local buf_path = util.path.sanitize(bufname)
+  local buf_path = vim.fs.normalize(bufname)
 
   local get_root_dir = self.config.root_dir
 
diff --git a/lua/lspconfig/util.lua b/lua/lspconfig/util.lua
index 041f56e65f..f89ceb6f43 100644
--- a/lua/lspconfig/util.lua
+++ b/lua/lspconfig/util.lua
@@ -102,14 +102,9 @@ M.path = (function()
     return path:gsub('([%[%]%?%*])', '\\%1')
   end
 
-  --- @param path string
-  --- @return string
+  --- @deprecated use `vim.fs.normalize` instead
   local function sanitize(path)
-    if iswin then
-      path = path:sub(1, 1):upper() .. path:sub(2)
-      path = path:gsub('\\', '/')
-    end
-    return path
+    return vim.fs.normalize(path)
   end
 
   --- @param filename string