--- a/fire/parser.py
+++ b/fire/parser.py
@@ -18,10 +18,7 @@ import ast
 import sys
 
-if sys.version_info[0:2] < (3, 8):
-  _StrNode = ast.Str  # type: ignore  # pylint: disable=no-member  # deprecated but needed for Python < 3.8
-else:
-  _StrNode = ast.Constant
+_StrNode = ast.Constant
 
 
 def CreateParser():
@@ -129,5 +126,5 @@ def _Replacement(node):
   # These are the only builtin constants supported by literal_eval.
   if value in ('True', 'False', 'None'):
     return node
-  return _StrNode(value)
+  return _StrNode(value=value)