diff --git a/mathics/builtin/box/expression.py b/mathics/builtin/box/expression.py
index b606ce5f4..a6243314f 100644
--- a/mathics/builtin/box/expression.py
+++ b/mathics/builtin/box/expression.py
@@ -1,7 +1,7 @@
 # This is never intended to go in Mathics3 docs
 no_doc = True
 
-from typing import Optional, Sequence
+from typing import Optional, Sequence, Union
 
 from mathics.core.attributes import A_PROTECTED, A_READ_PROTECTED
 from mathics.core.builtin import BuiltinElement
@@ -126,7 +126,7 @@ def head(self, value):
         raise ValueError("BoxExpression.head is write protected.")
 
     def has_form(
-        self, heads: Sequence[str] | str, *element_counts: Optional[int]
+        self, heads: Union[Sequence[str], str], *element_counts: Optional[int]
     ) -> bool:
         """
         element_counts:
diff --git a/mathics/core/element.py b/mathics/core/element.py
index c2a30c8cb..6c77e7829 100644
--- a/mathics/core/element.py
+++ b/mathics/core/element.py
@@ -6,7 +6,7 @@
 """
 
 from abc import ABC
-from typing import Any, Optional, Sequence, Tuple
+from typing import Any, Optional, Sequence, Tuple, Union
 
 from mathics.core.attributes import A_NO_ATTRIBUTES
 
@@ -388,7 +388,7 @@ def is_numeric(self, evaluation=None) -> bool:
         return False
 
     def has_form(
-        self, heads: Sequence[str] | str, *element_counts: Optional[int]
+        self, heads: Union[Sequence[str], str], *element_counts: Optional[int]
     ) -> bool:
         """Check if the expression is of the form Head[l1,...,ln]
         with Head.name in `heads` and a number of elements according to the specification in
diff --git a/mathics/core/expression.py b/mathics/core/expression.py
index 363ac8366..987176b73 100644
--- a/mathics/core/expression.py
+++ b/mathics/core/expression.py
@@ -784,7 +784,7 @@ def get_option_values(
             values = self.flatten_with_respect_to_head(SymbolList).elements
         else:
             values = [self]
-        option_values: dict[str, str | BaseElement] = {}
+        option_values: dict[str, Union[str, BaseElement]] = {}
         for option in values:
             symbol_name = option.get_name()
             if allow_symbols and symbol_name:
@@ -1035,7 +1035,7 @@ def is_uncertain_final_definitions(self, definitions) -> bool:
         return definitions.is_uncertain_final_value(time, cache.symbols)
 
     def has_form(
-        self, heads: Sequence[str] | str, *element_counts: Optional[int]
+        self, heads: Union[Sequence[str], str], *element_counts: Optional[int]
     ) -> bool:
         """
         element_counts:
diff --git a/mathics/core/pattern.py b/mathics/core/pattern.py
index e6433ca73..dc5d247bb 100644
--- a/mathics/core/pattern.py
+++ b/mathics/core/pattern.py
@@ -236,7 +236,7 @@ def get_option_values(
         return self.expr.get_option_values(evaluation, allow_symbols, stop_on_error)
 
     def has_form(
-        self, heads: Sequence[str] | str, *element_counts: Optional[int]
+        self, heads: Union[Sequence[str], str], *element_counts: Optional[int]
     ) -> bool:
         """Compare the expression against a form"""
         return self.expr.has_form(heads, *element_counts)
diff --git a/mathics/core/symbols.py b/mathics/core/symbols.py
index 60d170d7b..0206ad182 100644
--- a/mathics/core/symbols.py
+++ b/mathics/core/symbols.py
@@ -290,7 +290,7 @@ def get_sort_key(self, pattern_sort=False) -> tuple:
             raise NotImplementedError
 
     def has_form(
-        self, heads: Sequence[str] | str, *element_counts: Optional[int]
+        self, heads: Union[Sequence[str], str], *element_counts: Optional[int]
     ) -> bool:
         if element_counts:
             return False
diff --git a/mathics/eval/rules.py b/mathics/eval/rules.py
index fbbeb9d21..a6892d10f 100644
--- a/mathics/eval/rules.py
+++ b/mathics/eval/rules.py
@@ -18,7 +18,7 @@ def create_rules(
     name: str,
     evaluation: Evaluation,
     extra_args: OptionalType[List] = None,
-) -> Tuple[Union[List[Rule], BaseElement, None], bool] | "Dispatch":
+) -> Union[Tuple[Union[List[Rule], BaseElement, None], bool], "Dispatch"]:
     """
     This function implements  `Replace`, `ReplaceAll`, `ReplaceRepeated`
     and `ReplaceList` eval methods.