diff --git a/space2stats_api/app/utils/db_utils.py b/space2stats_api/app/utils/db_utils.py
index 5457fc0..cc2a843 100644
--- a/space2stats_api/app/utils/db_utils.py
+++ b/space2stats_api/app/utils/db_utils.py
@@ -10,12 +10,18 @@
 
 
 def get_summaries(fields, h3_ids):
-    h3_ids_str = ", ".join(f"'{h3_id}'" for h3_id in h3_ids)
-    sql_query = f"""
-    SELECT hex_id, {', '.join(fields)}
-    FROM {DB_TABLE_NAME}
-    WHERE hex_id IN ({h3_ids_str})
-    """
+    colnames = ['hex_id'] + fields
+    cols = [pg.sql.Identifier(c) for c in colnames]
+    sql_query = pg.sql.SQL(
+        """
+            SELECT {0}
+            FROM {1}
+            WHERE hex_id = ANY (%s)
+        """
+        ).format(
+            pg.sql.SQL(', ').join(cols),
+            pg.sql.Identifier(DB_TABLE_NAME)
+        )
     try:
         conn = pg.connect(
             host=DB_HOST,
@@ -25,7 +31,7 @@ def get_summaries(fields, h3_ids):
             password=DB_PASSWORD,
         )
         cur = conn.cursor()
-        cur.execute(sql_query)
+        cur.execute(sql_query, [h3_ids,])
         rows = cur.fetchall()
         colnames = [desc[0] for desc in cur.description]
         cur.close()
@@ -37,10 +43,10 @@ def get_summaries(fields, h3_ids):
 
 
 def get_available_fields():
-    sql_query = f"""
+    sql_query = """
     SELECT column_name
     FROM information_schema.columns
-    WHERE table_name = '{DB_TABLE_NAME}'
+    WHERE table_name = %s
     """
     try:
         conn = pg.connect(
@@ -51,7 +57,7 @@ def get_available_fields():
             password=DB_PASSWORD,
         )
         cur = conn.cursor()
-        cur.execute(sql_query)
+        cur.execute(sql_query, [DB_TABLE_NAME,])
         columns = [row[0] for row in cur.fetchall() if row[0] != "hex_id"]
         cur.close()
         conn.close()
diff --git a/space2stats_api/tests/test_db_utils.py b/space2stats_api/tests/test_db_utils.py
index 0047b05..a3d0b97 100644
--- a/space2stats_api/tests/test_db_utils.py
+++ b/space2stats_api/tests/test_db_utils.py
@@ -1,7 +1,7 @@
 import unittest
 from unittest.mock import patch, Mock
 from app.utils.db_utils import get_summaries, get_available_fields
-
+from psycopg.sql import SQL, Identifier
 
 @patch("psycopg.connect")
 def test_get_summaries(mock_connect):
@@ -18,18 +18,21 @@ def test_get_summaries(mock_connect):
     rows, colnames = get_summaries(fields, h3_ids)
 
     mock_connect.assert_called_once()
-    mock_cursor.execute.assert_called_once_with(
-        f"""
-    SELECT hex_id, {', '.join(fields)}
-    FROM space2stats
-    WHERE hex_id IN ('hex_1')
-    """
+    sql_query = SQL(
+        """
+            SELECT {0}
+            FROM {1}
+            WHERE hex_id = ANY (%s)
+        """
+    ).format(
+        SQL(', ').join([Identifier(c) for c in ['hex_id'] + fields]),
+        Identifier("space2stats")
     )
+    mock_cursor.execute.assert_called_once_with(sql_query, [h3_ids])
 
     assert rows == [("hex_1", 100, 200)]
     assert colnames == ["hex_id", "field1", "field2"]
 
-
 @patch("psycopg.connect")
 def test_get_available_fields(mock_connect):
     mock_conn = Mock()
@@ -43,15 +46,15 @@ def test_get_available_fields(mock_connect):
 
     mock_connect.assert_called_once()
     mock_cursor.execute.assert_called_once_with(
-        f"""
+    """
     SELECT column_name
     FROM information_schema.columns
-    WHERE table_name = 'space2stats'
-    """
+    WHERE table_name = %s
+    """,
+        ["space2stats"]
     )
 
     assert columns == ["field1", "field2", "field3"]
 
-
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()
\ No newline at end of file