diff --git a/lumi2/ldap.py b/lumi2/ldap.py
index 354139e..a1fd919 100644
--- a/lumi2/ldap.py
+++ b/lumi2/ldap.py
@@ -924,6 +924,52 @@ def delete_group(connection: Connection, group_cn: str) -> None:
     connection.delete(group_dn)
 
 
+def update_group(connection: Connection, group: Group) -> None:
+    """Updates the specified Group on the LDAP server.
+
+    Parameters
+    ----------
+    connection : ldap3.Connection
+        Bound Connection object to an LDAP server.
+    group : lumi2.usermodel.Group
+        The Group for which the LDAP entry is to be updated on the server.
+
+    Raises
+    ------
+    TypeError
+        If group is not of type Group.
+    EntryNotFoundException
+        If the specified group does not exist in the DIT, or if a user who is a
+        member of the Group does not exist in the DIT.
+    """
+
+    _assert_is_valid_connection(connection)
+    if not isinstance(group, Group):
+        raise TypeError(f"Expected a lumi2.usermodel.Group but got: '{type(group)}'.")
+
+    if not group_exists(connection, group.get_dn()):
+        raise EntryNotFoundException(
+            f"Failed to update group '{group.groupname}': no such entry found."
+        )
+
+    member_dn_list = []
+    for user in group.members:
+        user_dn = user.get_dn()
+        if not user_exists(connection, user_dn):
+            raise EntryNotFoundException(
+                f"Failed to create group '{group.groupname}': no entry found for " \
+                f"user '{user.username}'."
+            )
+        member_dn_list.append(user_dn)
+
+    connection.modify(
+        group.get_dn(),
+        {
+            "uniqueMember": [(MODIFY_REPLACE, member_dn_list)],
+        }
+    )
+
+
 def get_group(connection: Connection, group_cn: str) -> Group:
     """Retrieves the group with the specified CN (common name) from the LDAP server.
 
diff --git a/tests/test_ldap.py b/tests/test_ldap.py
index 5f9f98c..37046cb 100644
--- a/tests/test_ldap.py
+++ b/tests/test_ldap.py
@@ -322,6 +322,23 @@ def test_delete_group(app, connection):
             ll.delete_group(connection, "employees")
 
 
+def test_update_group(app, connection):
+    with app.app_context():
+        employees = ll.get_group(connection, "employees")
+        user0 = lu.User(
+            username="user0",
+            password_hash=lu.User.generate_password_hash("password"),
+            email="valid@example.com",
+            first_name="Test",
+            last_name="User",
+        )
+        employees.members.add(user0)
+        with pytest.raises(ll.EntryNotFoundException):
+            ll.update_group(connection, employees)
+        ll.create_user(connection, user0)
+        ll.update_group(connection, employees)
+        assert user0 in ll.get_group(connection, "employees").members
+
 
 def test_get_group(app, connection):
     with app.app_context():