diff --git a/lib/pghero/methods/basic.rb b/lib/pghero/methods/basic.rb
index a17bca63..87b034bb 100644
--- a/lib/pghero/methods/basic.rb
+++ b/lib/pghero/methods/basic.rb
@@ -42,7 +42,9 @@ def select_all(sql, conn: nil, query_columns: [])
         retries = 0
         begin
           result = conn.select_all(add_source(squish(sql)))
-          if ActiveRecord::VERSION::STRING.to_f >= 6.1
+          if ActiveRecord::VERSION::MAJOR >= 8
+            result = result.to_a.map(&:symbolize_keys)
+          elsif ActiveRecord::VERSION::STRING.to_f >= 6.1
             result = result.map(&:symbolize_keys)
           else
             result = result.map { |row| row.to_h { |col, val| [col.to_sym, result.column_types[col].send(:cast_value, val)] } }