diff --git a/GPT_SoVITS/TTS_infer_pack/TTS.py b/GPT_SoVITS/TTS_infer_pack/TTS.py
index 98c1032..da6a6df 100644
--- a/GPT_SoVITS/TTS_infer_pack/TTS.py
+++ b/GPT_SoVITS/TTS_infer_pack/TTS.py
@@ -304,8 +304,8 @@ class TTS_Config:
             configs: dict = self._load_configs(self.configs_path)
 
         assert isinstance(configs, dict)
-        version = configs.get("version", "v2")
-        assert version in ["v1", "v2", "v3", "v4", "v2Pro", "v2ProPlus"]
+        version = configs.get("version", "v2").lower()
+        assert version in ["v1", "v2", "v3", "v4", "v2pro", "v2proplus"]
         self.default_configs[version] = configs.get(version, self.default_configs[version])
         self.configs: dict = configs.get("custom", deepcopy(self.default_configs[version]))