diff --git a/pyproject.toml b/pyproject.toml
index db34dfe..e781a13 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ classifiers = [
 dependencies = [
     "jsonschema~=4.23",
     "loguru~=0.7.2",
-    "pandas~=2.2",
+    "pandas>=2.2",
     "plexosdb~=0.0.6",
     "polars~=1.1.0",
     "pyyaml~=6.0.1",
diff --git a/src/r2x/parser/handler.py b/src/r2x/parser/handler.py
index 9b86ab3..695378a 100644
--- a/src/r2x/parser/handler.py
+++ b/src/r2x/parser/handler.py
@@ -240,7 +240,8 @@ def csv_handler(fpath: Path, csv_file_encoding="utf8", **kwargs) -> pl.DataFrame
         logger.debug("File {} is empty. Skipping it.", fpath)
         return
 
-    data_file = pl_lowercase(data_file)
+    if not kwargs.get("keep_case"):
+        data_file = pl_lowercase(data_file)
 
     return data_file