diff --git a/lua/ow/lsp/server.lua b/lua/ow/lsp/server.lua
index 3f24053..88180fd 100644
--- a/lua/ow/lsp/server.lua
+++ b/lua/ow/lsp/server.lua
@@ -338,6 +338,7 @@ function M:deinit()
         self.linters = nil
     end
 
+    require("lspconfig.configs")[self.name] = nil
     require("lspconfig")[self.name] = nil
 end
 
@@ -359,7 +360,7 @@ function M.new(name, config)
     local ok, resp = pcall(require, "lspconfig.configs." .. name)
     if not ok and config.lspconfig then
         local configs = require("lspconfig.configs")
-        configs[name] = { default_config = config.lspconfig }
+        configs[name] = { default_config = vim.deepcopy(config.lspconfig) }
     elseif ok then
         config.lspconfig = vim.tbl_deep_extend(
             "keep",