diff --git a/flix.toml b/flix.toml
index 007ad0e..46ba6a7 100644
--- a/flix.toml
+++ b/flix.toml
@@ -1,6 +1,6 @@
 [package]
 name        = "ListSet"
 description = "A set that just requires equality."
-version     = "0.3.0"
-flix        = "0.51.0"
+version     = "0.4.0"
+flix        = "0.53.0"
 authors     = ["Jonathan Lindegaard Starup"]
diff --git a/test/Test/Property/ListSetGenerator.flix b/test/Test/Property/ListSetGenerator.flix
index fd36f6f..81ca278 100644
--- a/test/Test/Property/ListSetGenerator.flix
+++ b/test/Test/Property/ListSetGenerator.flix
@@ -1,3 +1,19 @@
+//
+// Copyright 2024 Jonathan Lindegaard Starup
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
 mod JonathanStarup.Test.Property.ListSetGenerator {
     use Collectable.collect
     use JonathanStarup.ListSet