diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e3aca2..0863c15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ The changelog format is based on [Keep a Changelog](https://keepachangelog.com/e
 * -/-
 
 
+### Changed
+* Python modules: Changed `__ALL__` to `__all__` (lowercase, PEP8 and PEP257 compliant).
+
+
 ## [0.4.4] - 2026-03-26
 
 ### Changed
diff --git a/src/dictIO/cpp_dict.py b/src/dictIO/cpp_dict.py
index 557ca1f..65aacee 100644
--- a/src/dictIO/cpp_dict.py
+++ b/src/dictIO/cpp_dict.py
@@ -21,7 +21,7 @@
     from _collections_abc import Iterable, Mapping
 
 
-__ALL__ = [
+__all__ = [
     "CppDict",
 ]
 
diff --git a/src/dictIO/dict.py b/src/dictIO/dict.py
index e818c38..d772922 100644
--- a/src/dictIO/dict.py
+++ b/src/dictIO/dict.py
@@ -29,7 +29,7 @@
 )
 from dictIO.utils.path import relative_path
 
-__ALL__ = [
+__all__ = [
     "SDict",
 ]
 
diff --git a/src/dictIO/dict_parser.py b/src/dictIO/dict_parser.py
index 7c2cb75..e00fbcf 100644
--- a/src/dictIO/dict_parser.py
+++ b/src/dictIO/dict_parser.py
@@ -8,7 +8,7 @@
 
 from dictIO import DictReader, DictWriter, SDict, create_target_file_name
 
-__ALL__ = ["DictParser"]
+__all__ = ["DictParser"]
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/dictIO/dict_reader.py b/src/dictIO/dict_reader.py
index 11126f9..d5144cb 100644
--- a/src/dictIO/dict_reader.py
+++ b/src/dictIO/dict_reader.py
@@ -44,7 +44,7 @@
 from dictIO.types import K, M, V
 from dictIO.utils.counter import DejaVue
 
-__ALL__ = ["DictReader"]
+__all__ = ["DictReader"]
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/dictIO/dict_writer.py b/src/dictIO/dict_writer.py
index 43a02a6..235eb2c 100644
--- a/src/dictIO/dict_writer.py
+++ b/src/dictIO/dict_writer.py
@@ -10,7 +10,7 @@
 from dictIO import Formatter, NativeParser, SDict, order_keys
 from dictIO.types import K, V
 
-__ALL__ = ["DictWriter", "create_target_file_name"]
+__all__ = ["DictWriter", "create_target_file_name"]
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/dictIO/formatter.py b/src/dictIO/formatter.py
index cdcb72b..39b1e87 100644
--- a/src/dictIO/formatter.py
+++ b/src/dictIO/formatter.py
@@ -21,11 +21,11 @@
 if TYPE_CHECKING:
     from dictIO.types import K, M, S, TKey, TSingleValue, TValue, V
 
-__ALL__ = [
-    "Formatter",
-    "NativeFormatter",
+__all__ = [
     "FoamFormatter",
+    "Formatter",
     "JsonFormatter",
+    "NativeFormatter",
     "XmlFormatter",
 ]
 
diff --git a/src/dictIO/parser.py b/src/dictIO/parser.py
index 2a08318..6803dd1 100644
--- a/src/dictIO/parser.py
+++ b/src/dictIO/parser.py
@@ -24,7 +24,7 @@
 if TYPE_CHECKING:
     import os
 
-__ALL__ = ["Parser", "NativeParser", "FoamParser", "JsonParser", "XmlParser"]
+__all__ = ["FoamParser", "JsonParser", "NativeParser", "Parser", "XmlParser"]
 
 logger = logging.getLogger(__name__)