diff --git a/airflow-core/src/airflow/dag_processing/manager.py b/airflow-core/src/airflow/dag_processing/manager.py
index f6bf7891945ce..fed39d77675f9 100644
--- a/airflow-core/src/airflow/dag_processing/manager.py
+++ b/airflow-core/src/airflow/dag_processing/manager.py
@@ -21,6 +21,7 @@
 
 import contextlib
 import functools
+import gc
 import inspect
 import logging
 import os
@@ -279,6 +280,9 @@ def run(self):
 
         self._symlink_latest_log_directory()
 
+        # To prevent COW in forked process parsing dag file
+        gc.freeze()
+
         return self._run_parsing_loop()
 
     def _scan_stale_dags(self):