diff --git a/calculator/calculator.py b/calculator/calculator.py
index ab4570f177c87b43aa675b77bb094d01a156c3e9..58672ef0f77e55efb9cd531c33a77867c007bb31 100644
--- a/calculator/calculator.py
+++ b/calculator/calculator.py
@@ -18,7 +18,7 @@ class Calculator:
             operators = STANDARD_OPERATORS
         self.operators = operators
 
-    def tokenize(self, line: str) -> list[Token]:
+    def tokenize(self, line: str):
         """
         Tokenize an expression into a list of tokens.
         """
@@ -34,7 +34,7 @@ class Calculator:
                     raise ValueError(f"Invalid token {token}") from exc
         return tokens
 
-    def parse(self, tokens: list[Token]) -> Expression:
+    def parse(self, tokens) -> Expression:
         """
         Parse a list of tokens into an ordered expression.
         """