diff --git a/schemas/haxe_language_server.json b/schemas/haxe_language_server.json
index ef96378..66ae857 100644
--- a/schemas/haxe_language_server.json
+++ b/schemas/haxe_language_server.json
@@ -792,6 +792,11 @@
       "markdownDescription": "Whether to revert to a Haxe 3 style completion where only toplevel packages and imported types are shown (effectively making it incompatible with auto-imports). *Note:* this setting has no effect with Haxe versions earlier than 4.0.0-rc.4.",
       "type": "boolean"
     },
+    "haxe.useLegacyDiagnostics": {
+      "default": false,
+      "markdownDescription": "Haxe 4.3.5 introduces new Json RPC based diagnostics. in order to be able to opt out of them set option to true. *Note:* will stop working on nightlies once #11413 gets merged",
+      "type": "boolean"
+    },
     "haxelib.executable": {
       "anyOf": [
         {
diff --git a/types/lsp.lua b/types/lsp.lua
index 6aff8d8..a9bc9e3 100644
--- a/types/lsp.lua
+++ b/types/lsp.lua
@@ -3525,6 +3525,8 @@
 ---@field taskPresentation _.lspconfig.settings.haxe_language_server.TaskPresentation
 -- Whether to revert to a Haxe 3 style completion where only toplevel packages and imported types are shown (effectively making it incompatible with auto-imports). *Note:* this setting has no effect with Haxe versions earlier than 4.0.0-rc.4.
 ---@field useLegacyCompletion boolean
+-- Haxe 4.3.5 introduces new Json RPC based diagnostics. in order to be able to opt out of them set option to true. *Note:* will stop working on nightlies once #11413 gets merged
+---@field useLegacyDiagnostics boolean
 
 ---@class _.lspconfig.settings.haxe_language_server.Haxelib
 -- Path to the Haxelib executable