diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d02f4d7..7076eeb 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ default_language_version:
     python: python3.12
 repos:
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.9
+    rev: v0.15.6
     hooks:
     -   id: ruff
         args:
diff --git a/simnet/utils/lang.py b/simnet/utils/lang.py
index c54d53d..8ea8061 100644
--- a/simnet/utils/lang.py
+++ b/simnet/utils/lang.py
@@ -12,4 +12,4 @@ def create_short_lang_code(lang: str) -> str:
     Returns:
         str: The shortened language code.
     """
-    return lang if "zh" in lang else lang.split("-")[0]
+    return lang if "zh" in lang else lang.split("-", maxsplit=1)[0]