diff --git a/quantio/vector.py b/quantio/vector.py
index fea8477..640205b 100644
--- a/quantio/vector.py
+++ b/quantio/vector.py
@@ -23,3 +23,7 @@ def __class_getitem__(cls, *_: object) -> type:
     def __getitem__(self, index: int) -> T:
         """Return the element at a specific index."""
         return self._elements[index]
+
+    def __setitem__(self, index: int, value: T) -> None:
+        """Set the element at a specific index."""
+        self._elements[index] = value
diff --git a/test/test_vector.py b/test/test_vector.py
index dc1624d..60229ae 100644
--- a/test/test_vector.py
+++ b/test/test_vector.py
@@ -6,18 +6,25 @@
 
 
 def test_init():
-    actual: Vector[Length] = Vector([Length.zero(), Length.zero()])
-    assert np.all(actual._elements == np.array([Length.zero(), Length.zero()]))
+    vec: Vector[Length] = Vector([Length.zero(), Length.zero()])
+    assert np.all(vec._elements == np.array([Length.zero(), Length.zero()]))
 
 
 def test_init_with_type_hint():
-    actual = Vector[Length]([Length.zero(), Length.zero()])
-    assert np.all(actual._elements == np.array([Length.zero(), Length.zero()]))
+    vec = Vector[Length]([Length.zero(), Length.zero()])
+    assert np.all(vec._elements == np.array([Length.zero(), Length.zero()]))
 
 
 def test_indexing():
-    actual: Vector[Length] = Vector([Length(meters=1), Length(meters=2)])
-    assert actual[0] == Length(meters=1)
+    vec: Vector[Length] = Vector([Length(meters=1), Length(meters=2)])
+    assert vec[0] == Length(meters=1)
+
+
+def test_set_item():
+    vec: Vector[Length] = Vector([Length(meters=1), Length(meters=2)])
+    vec[0] = Length(meters=3)
+
+    assert vec[0] == Length(meters=3)
 
 
 if __name__ == "__main__":