diff --git a/.gitignore b/.gitignore
index 92f9633..d69c82d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,4 +11,6 @@
 /.python-version
 /uv.lock
 
-/.venv
\ No newline at end of file
+/.venv
+
+*.pyc
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 028783c..6560f86 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,4 +6,5 @@ readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
     "orjson>=3.11.1",
+    "polars>=1.32.0",
 ]
diff --git a/utils/export_regions.py b/utils/export_regions.py
new file mode 100644
index 0000000..13cf8ab
--- /dev/null
+++ b/utils/export_regions.py
@@ -0,0 +1,7 @@
+import polars as pl
+
+from hasher import salted_hash_userid
+
+pl.scan_parquet("regions.parquet").with_columns(
+    pl.col("user_id").map_elements(salted_hash_userid, return_dtype=pl.String)
+).collect().write_parquet("regions_pub.parquet")