diff --git a/src/flask_caching/__init__.py b/src/flask_caching/__init__.py
index 1dd424f..fbd1605 100644
--- a/src/flask_caching/__init__.py
+++ b/src/flask_caching/__init__.py
@@ -247,7 +247,7 @@ def cached(
         forced_update: Optional[Callable] = None,
         response_filter: Optional[Callable] = None,
         query_string: bool = False,
-        hash_method: Callable = hashlib.md5,
+        hash_method: Callable = hashlib.sha256,
         cache_none: bool = False,
         make_cache_key: Optional[Callable] = None,
         source_check: Optional[bool] = None,
@@ -607,7 +607,7 @@ def _memoize_make_cache_key(
         make_name: Optional[Callable] = None,
         timeout: Optional[Callable] = None,
         forced_update: bool = False,
-        hash_method: Callable = hashlib.md5,
+        hash_method: Callable = hashlib.sha256,
         source_check: Optional[bool] = False,
         args_to_ignore: Optional[Any] = None,
     ) -> Callable:
@@ -752,7 +752,7 @@ def memoize(
         unless: Optional[Callable] = None,
         forced_update: Optional[Callable] = None,
         response_filter: Optional[Callable] = None,
-        hash_method: Callable = hashlib.md5,
+        hash_method: Callable = hashlib.sha256,
         cache_none: bool = False,
         source_check: Optional[bool] = None,
         args_to_ignore: Optional[Any] = None,