diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a5a50d..053bdae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 - General: Drop support for Python 3.6 and 3.7 (thanks to @LecrisUT)
 - General: Officially support Python 3.13
 - Google: Fix multi-line parameter definitions (thanks to @coolbeevip)
+- Attrdoc: Remove use of deprecated ast classes (thanks to @fedepell)
+- Attrdoc: Remove code related to Python <= 3.7
 
 # 0.16 (2024-03-15)
 
diff --git a/docstring_parser/attrdoc.py b/docstring_parser/attrdoc.py
index 170bbd1..de84a85 100644
--- a/docstring_parser/attrdoc.py
+++ b/docstring_parser/attrdoc.py
@@ -5,28 +5,16 @@
 
 import ast
 import inspect
-import sys
 import textwrap
 import typing as T
 from types import ModuleType
 
 from .common import Docstring, DocstringParam
 
-ast_constant_attr = {ast.Constant: "value"}
-
-if sys.version_info[:2] <= (3, 7):
-    ast_constant_attr.update(
-        {
-            ast.NameConstant: "value",
-            ast.Num: "n",
-            ast.Str: "s",
-        }
-    )
-
 
 def ast_get_constant_value(node: ast.AST) -> T.Any:
     """Return the constant's value if the given node is a constant."""
-    return getattr(node, ast_constant_attr[node.__class__])
+    return getattr(node, "value")
 
 
 def ast_unparse(node: ast.AST) -> T.Optional[str]:
@@ -34,7 +22,7 @@ def ast_unparse(node: ast.AST) -> T.Optional[str]:
     if hasattr(ast, "unparse"):
         return ast.unparse(node)
     # Support simple cases in Python < 3.9
-    if isinstance(node, (ast.Constant)):
+    if isinstance(node, ast.Constant):
         return str(ast_get_constant_value(node))
     if isinstance(node, ast.Name):
         return node.id
@@ -45,7 +33,7 @@ def ast_is_literal_str(node: ast.AST) -> bool:
     """Return True if the given node is a literal string."""
     return (
         isinstance(node, ast.Expr)
-        and isinstance(node.value, (ast.Constant))
+        and isinstance(node.value, ast.Constant)
         and isinstance(ast_get_constant_value(node.value), str)
     )