diff --git a/README.md b/README.md
index 13e316f..6db99da 100644
--- a/README.md
+++ b/README.md
@@ -296,9 +296,12 @@ require('lsp-setup').setup({
     end,
     -- Global capabilities
     capabilities = vim.lsp.protocol.make_client_capabilities(),
-    -- Configuration of LSP servers 
+    -- Install LSP servers automatically (requires mason and mason-lspconfig)
+    ensure_installed = {
+        "lua_ls"
+    },
+    -- Configuration of LSP servers
     servers = {
-        -- Install LSP servers automatically (requires mason and mason-lspconfig)
         -- LSP server configuration please see: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
         -- pylsp = {},
         -- rust_analyzer = {
diff --git a/lua/lsp-setup/init.lua b/lua/lsp-setup/init.lua
index 3151ef8..7313203 100644
--- a/lua/lsp-setup/init.lua
+++ b/lua/lsp-setup/init.lua
@@ -76,6 +76,8 @@ M.defaults = {
     end,
     --- @type table<string, table|function>
     servers = {},
+    --- @type string[]
+    ensure_installed = {},
     inlay_hints = inlay_hints.opts,
 }
 
@@ -86,7 +88,7 @@ function M.setup(opts)
         return
     end
 
-    opts = vim.tbl_deep_extend('keep', opts, M.defaults)
+    opts = vim.tbl_deep_extend('force', M.defaults, opts)
 
     vim.api.nvim_create_augroup('LspSetup', {})
     vim.api.nvim_create_autocmd('LspAttach', {
@@ -98,7 +100,7 @@ function M.setup(opts)
                 mappings = vim.tbl_deep_extend('keep', mappings or {}, default_mappings)
             end
             utils.mappings(bufnr, mappings)
-        end
+        end,
     })
 
     inlay_hints.setup(opts.inlay_hints)
@@ -111,17 +113,20 @@ function M.setup(opts)
             mason.setup()
         end
         mason_lspconfig.setup({
-            ensure_installed = utils.get_keys(opts.servers),
+            ensure_installed = vim.tbl_values(opts.ensure_installed),
         })
         mason_lspconfig.setup_handlers({
             function(server_name)
-                local config = servers[server_name] or nil
+                local config = M.defaults.ensure_installed[server_name] or nil
                 if config == nil then
                     return
                 end
                 require('lspconfig')[server_name].setup(config)
-            end
+            end,
         })
+        for server_name, config in pairs(servers) do
+            require('lspconfig')[server_name].setup(config)
+        end
         return
     else
         for server_name, config in pairs(servers) do