diff --git a/dyn_huffman.py b/dyn_huffman.py
index 4ff9dc712bb73e57aaa4b8f1f930dcdc26014cbc..463ce36deb39b87691c8b94cb0ba40c345157b4d 100644
--- a/dyn_huffman.py
+++ b/dyn_huffman.py
@@ -151,7 +151,7 @@ def encode(input: str) -> str:
     return ' '.join(encoded)[1:]
 
 
-def decode(encoded: str) -> (str, str):
+def decode(encoded: str) -> tuple[str, str]:
     bits = encoded.replace(' ', '')
     tree = Node()
     result = ''