diff --git a/CHANGELOG.md b/CHANGELOG.md
index f82970f..810d53b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Support `|` and `|=` operator for tables, and support `+` and `+=` operator for arrays. ([#331](https://github.com/sdispater/tomlkit/issues/331))
+
 ## [0.12.3] - 2023-11-15
 
 ### Fixed
diff --git a/tomlkit/_types.py b/tomlkit/_types.py
index cc1847b..8eeb75e 100644
--- a/tomlkit/_types.py
+++ b/tomlkit/_types.py
@@ -43,9 +43,27 @@ def _new(self: WT, value: Any) -> WT:
     class _CustomList(MutableSequence, list):
         """Adds MutableSequence mixin while pretending to be a builtin list"""
 
+        def __add__(self, other):
+            new_list = self.copy()
+            new_list.extend(other)
+            return new_list
+
+        def __iadd__(self, other):
+            self.extend(other)
+            return self
+
     class _CustomDict(MutableMapping, dict):
         """Adds MutableMapping mixin while pretending to be a builtin dict"""
 
+        def __or__(self, other):
+            new_dict = self.copy()
+            new_dict.update(other)
+            return new_dict
+
+        def __ior__(self, other):
+            self.update(other)
+            return self
+
     class _CustomInt(Integral, int):
         """Adds Integral mixin while pretending to be a builtin int"""
 
@@ -54,7 +72,7 @@ class _CustomFloat(Real, float):
 
 
 def wrap_method(
-    original_method: Callable[Concatenate[WT, P], Any]
+    original_method: Callable[Concatenate[WT, P], Any],
 ) -> Callable[Concatenate[WT, P], Any]:
     def wrapper(self: WT, *args: P.args, **kwargs: P.kwargs) -> Any:
         result = original_method(self, *args, **kwargs)