diff --git a/providers/fab/src/airflow/providers/fab/www/session.py b/providers/fab/src/airflow/providers/fab/www/session.py
index ac66392e50a78..d6c52c4498e20 100644
--- a/providers/fab/src/airflow/providers/fab/www/session.py
+++ b/providers/fab/src/airflow/providers/fab/www/session.py
@@ -24,22 +24,19 @@
 
 
 class _LazySafeSerializer:
-    def encode(self, session_dict):
+    def dumps(self, session_dict):
         encoder = msgspec.msgpack.Encoder(
             enc_hook=lambda obj: str(obj) if isinstance(obj, LazyString) else obj
         )
-
         return encoder.encode(dict(session_dict))
 
-    def decode(self, data):
+    def loads(self, data):
         decoder = msgspec.msgpack.Decoder()
-
         return decoder.decode(data)
 
-    def _default(self, obj):
-        if isinstance(obj, LazyString):
-            return str(obj)
-        raise TypeError(f"Unsupported type: {type(obj)}")
+    # optional old API
+    encode = dumps
+    decode = loads
 
 
 class SessionExemptMixin:
diff --git a/providers/fab/www-hash.txt b/providers/fab/www-hash.txt
index aa7744f8ab875..631b5559a77ed 100644
--- a/providers/fab/www-hash.txt
+++ b/providers/fab/www-hash.txt
@@ -1 +1 @@
-cebe3cef25a05608c332bf94f46f37596bd8f5a9309263f860a213daf79b3496
+7a1e18d5c6ae8a2fe65e6e36e21549a9a5067e2c1866a2047e88e355d7bec373