diff --git a/build.sbt b/build.sbt
index a593cbe3..09a9ba14 100644
--- a/build.sbt
+++ b/build.sbt
@@ -9,6 +9,7 @@ lazy val commonSettings = Seq(
   sonatypeProfileName := "com.firstbird",
   homepage            := Some(url("https://github.com/firstbirdtech/backbone")),
   licenses += ("MIT", url("http://opensource.org/licenses/MIT")),
+  startYear := Some(2016),
   scmInfo := Some(
     ScmInfo(homepage.value.get, "scm:git:https://github.com/firstbirdtech/backbone.git")
   ),
@@ -54,7 +55,7 @@ lazy val commonSettings = Seq(
   // show full stack traces and test case durations
   Test / testOptions += Tests.Argument("-oDF"),
   Test / parallelExecution := false,
-  headerLicense            := Some(HeaderLicense.MIT("2021", "Backbone contributors")),
+  headerLicense            := Some(HeaderLicense.MIT("2024", "Backbone contributors")),
   semanticdbEnabled        := true,
   semanticdbVersion        := scalafixSemanticdb.revision
 )
diff --git a/circe/src/main/scala/backbone/circe/CirceJsonReader.scala b/circe/src/main/scala/backbone/circe/CirceJsonReader.scala
index e3c94484..67a12f82 100644
--- a/circe/src/main/scala/backbone/circe/CirceJsonReader.scala
+++ b/circe/src/main/scala/backbone/circe/CirceJsonReader.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/circe/src/test/scala/backbone/circe/CirceJsonReaderSpec.scala b/circe/src/test/scala/backbone/circe/CirceJsonReaderSpec.scala
index 57afd67e..137c7305 100644
--- a/circe/src/test/scala/backbone/circe/CirceJsonReaderSpec.scala
+++ b/circe/src/test/scala/backbone/circe/CirceJsonReaderSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.circe
 
 import backbone.consumer.JsonReader
diff --git a/consumer/src/main/scala/backbone/MessageReader.scala b/consumer/src/main/scala/backbone/MessageReader.scala
index fc70f1ed..c376d8e6 100644
--- a/consumer/src/main/scala/backbone/MessageReader.scala
+++ b/consumer/src/main/scala/backbone/MessageReader.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/ProcessingResult.scala b/consumer/src/main/scala/backbone/ProcessingResult.scala
index e5779a15..6b39b2ab 100644
--- a/consumer/src/main/scala/backbone/ProcessingResult.scala
+++ b/consumer/src/main/scala/backbone/ProcessingResult.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/CountLimitation.scala b/consumer/src/main/scala/backbone/consumer/CountLimitation.scala
index 45709ec2..41baebde 100644
--- a/consumer/src/main/scala/backbone/consumer/CountLimitation.scala
+++ b/consumer/src/main/scala/backbone/consumer/CountLimitation.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/DefaultMessageReaders.scala b/consumer/src/main/scala/backbone/consumer/DefaultMessageReaders.scala
index 2a2a252c..bfe1a702 100644
--- a/consumer/src/main/scala/backbone/consumer/DefaultMessageReaders.scala
+++ b/consumer/src/main/scala/backbone/consumer/DefaultMessageReaders.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/JsonReader.scala b/consumer/src/main/scala/backbone/consumer/JsonReader.scala
index 035faa28..82b28033 100644
--- a/consumer/src/main/scala/backbone/consumer/JsonReader.scala
+++ b/consumer/src/main/scala/backbone/consumer/JsonReader.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/Limitation.scala b/consumer/src/main/scala/backbone/consumer/Limitation.scala
index a2cbc352..66fb90df 100644
--- a/consumer/src/main/scala/backbone/consumer/Limitation.scala
+++ b/consumer/src/main/scala/backbone/consumer/Limitation.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/MessageHeaders.scala b/consumer/src/main/scala/backbone/consumer/MessageHeaders.scala
index 285c6b97..c57a84b1 100644
--- a/consumer/src/main/scala/backbone/consumer/MessageHeaders.scala
+++ b/consumer/src/main/scala/backbone/consumer/MessageHeaders.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/Settings.scala b/consumer/src/main/scala/backbone/consumer/Settings.scala
index daf380d6..cb439c97 100644
--- a/consumer/src/main/scala/backbone/consumer/Settings.scala
+++ b/consumer/src/main/scala/backbone/consumer/Settings.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/javadsl/Consumer.scala b/consumer/src/main/scala/backbone/consumer/javadsl/Consumer.scala
index 8753747d..27078142 100644
--- a/consumer/src/main/scala/backbone/consumer/javadsl/Consumer.scala
+++ b/consumer/src/main/scala/backbone/consumer/javadsl/Consumer.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/package.scala b/consumer/src/main/scala/backbone/consumer/package.scala
index 6f43e76c..cf7c7957 100644
--- a/consumer/src/main/scala/backbone/consumer/package.scala
+++ b/consumer/src/main/scala/backbone/consumer/package.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
@@ -22,7 +22,7 @@
 package backbone
 
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/main/scala/backbone/consumer/scaladsl/Consumer.scala b/consumer/src/main/scala/backbone/consumer/scaladsl/Consumer.scala
index cdddef03..68e3e3bd 100644
--- a/consumer/src/main/scala/backbone/consumer/scaladsl/Consumer.scala
+++ b/consumer/src/main/scala/backbone/consumer/scaladsl/Consumer.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/consumer/src/test/scala/backbone/MessageReaderSpec.scala b/consumer/src/test/scala/backbone/MessageReaderSpec.scala
index 7825ed88..53e8a07b 100644
--- a/consumer/src/test/scala/backbone/MessageReaderSpec.scala
+++ b/consumer/src/test/scala/backbone/MessageReaderSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone
 
 import backbone.testutil.BaseTest
diff --git a/consumer/src/test/scala/backbone/consumer/DefaultMessageReadersSpec.scala b/consumer/src/test/scala/backbone/consumer/DefaultMessageReadersSpec.scala
index aa12805f..24d45773 100644
--- a/consumer/src/test/scala/backbone/consumer/DefaultMessageReadersSpec.scala
+++ b/consumer/src/test/scala/backbone/consumer/DefaultMessageReadersSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.consumer
 
 import backbone.MessageReader
diff --git a/consumer/src/test/scala/backbone/consumer/scaladsl/ConsumerSpec.scala b/consumer/src/test/scala/backbone/consumer/scaladsl/ConsumerSpec.scala
index 77d98f34..f2076335 100644
--- a/consumer/src/test/scala/backbone/consumer/scaladsl/ConsumerSpec.scala
+++ b/consumer/src/test/scala/backbone/consumer/scaladsl/ConsumerSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.consumer.scaladsl
 
 import backbone.consumer.{CountLimitation, JsonReader, Settings, _}
diff --git a/consumer/src/test/scala/backbone/testutil/Helpers.scala b/consumer/src/test/scala/backbone/testutil/Helpers.scala
index fec657f7..6f2ad07e 100644
--- a/consumer/src/test/scala/backbone/testutil/Helpers.scala
+++ b/consumer/src/test/scala/backbone/testutil/Helpers.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.testutil
 
 import backbone.consumer.JsonReader
diff --git a/consumer/src/test/scala/backbone/testutil/TestJsonReader.scala b/consumer/src/test/scala/backbone/testutil/TestJsonReader.scala
index 1d9fff81..6112f50c 100644
--- a/consumer/src/test/scala/backbone/testutil/TestJsonReader.scala
+++ b/consumer/src/test/scala/backbone/testutil/TestJsonReader.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.testutil
 
 import backbone.consumer.JsonReader
diff --git a/core/src/main/scala/backbone/aws/AmazonSnsOps.scala b/core/src/main/scala/backbone/aws/AmazonSnsOps.scala
index 3ade8ff1..0681499d 100644
--- a/core/src/main/scala/backbone/aws/AmazonSnsOps.scala
+++ b/core/src/main/scala/backbone/aws/AmazonSnsOps.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/aws/AmazonSqsOps.scala b/core/src/main/scala/backbone/aws/AmazonSqsOps.scala
index 119ae1fb..9ecb9dd3 100644
--- a/core/src/main/scala/backbone/aws/AmazonSqsOps.scala
+++ b/core/src/main/scala/backbone/aws/AmazonSqsOps.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/aws/CreateQueueParams.scala b/core/src/main/scala/backbone/aws/CreateQueueParams.scala
index 82b02a8c..99225681 100644
--- a/core/src/main/scala/backbone/aws/CreateQueueParams.scala
+++ b/core/src/main/scala/backbone/aws/CreateQueueParams.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/consumer/ConsumerSettings.scala b/core/src/main/scala/backbone/consumer/ConsumerSettings.scala
index 0b1de717..5b5eb2d6 100644
--- a/core/src/main/scala/backbone/consumer/ConsumerSettings.scala
+++ b/core/src/main/scala/backbone/consumer/ConsumerSettings.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/javadsl/Backbone.scala b/core/src/main/scala/backbone/javadsl/Backbone.scala
index 8915e165..d4b423a1 100644
--- a/core/src/main/scala/backbone/javadsl/Backbone.scala
+++ b/core/src/main/scala/backbone/javadsl/Backbone.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/package.scala b/core/src/main/scala/backbone/package.scala
index e8795b9d..c4d1729a 100644
--- a/core/src/main/scala/backbone/package.scala
+++ b/core/src/main/scala/backbone/package.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/publisher/PublisherSettings.scala b/core/src/main/scala/backbone/publisher/PublisherSettings.scala
index 5d635988..16e8cc21 100644
--- a/core/src/main/scala/backbone/publisher/PublisherSettings.scala
+++ b/core/src/main/scala/backbone/publisher/PublisherSettings.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/main/scala/backbone/scaladsl/Backbone.scala b/core/src/main/scala/backbone/scaladsl/Backbone.scala
index cbd3fe2f..3473ed8d 100644
--- a/core/src/main/scala/backbone/scaladsl/Backbone.scala
+++ b/core/src/main/scala/backbone/scaladsl/Backbone.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/core/src/test/java/backbone/BackboneTest.java b/core/src/test/java/backbone/BackboneTest.java
index 9a29d372..92d86d9b 100644
--- a/core/src/test/java/backbone/BackboneTest.java
+++ b/core/src/test/java/backbone/BackboneTest.java
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone;
 
 import akka.Done;
diff --git a/core/src/test/java/backbone/testutil/TestContext.java b/core/src/test/java/backbone/testutil/TestContext.java
index 2f98601d..6c49046e 100644
--- a/core/src/test/java/backbone/testutil/TestContext.java
+++ b/core/src/test/java/backbone/testutil/TestContext.java
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.testutil;
 
 import akka.actor.ActorSystem;
diff --git a/core/src/test/scala/backbone/scaladsl/BackboneConsumeSpec.scala b/core/src/test/scala/backbone/scaladsl/BackboneConsumeSpec.scala
index 861dde93..2af1c709 100644
--- a/core/src/test/scala/backbone/scaladsl/BackboneConsumeSpec.scala
+++ b/core/src/test/scala/backbone/scaladsl/BackboneConsumeSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.scaladsl
 
 import backbone.consumer.DefaultMessageReaders.stringFormat
diff --git a/core/src/test/scala/backbone/scaladsl/BackbonePublishSpec.scala b/core/src/test/scala/backbone/scaladsl/BackbonePublishSpec.scala
index cc1831af..02c64d16 100644
--- a/core/src/test/scala/backbone/scaladsl/BackbonePublishSpec.scala
+++ b/core/src/test/scala/backbone/scaladsl/BackbonePublishSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.scaladsl
 
 import akka.Done
diff --git a/core/src/test/scala/backbone/scaladsl/BackboneSubscriptionSpec.scala b/core/src/test/scala/backbone/scaladsl/BackboneSubscriptionSpec.scala
index 8bc83261..d135336c 100644
--- a/core/src/test/scala/backbone/scaladsl/BackboneSubscriptionSpec.scala
+++ b/core/src/test/scala/backbone/scaladsl/BackboneSubscriptionSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.scaladsl
 
 import akka.stream.alpakka.sqs.{MessageSystemAttributeName, SqsSourceSettings}
diff --git a/core/src/test/scala/backbone/testutil/Helpers.scala b/core/src/test/scala/backbone/testutil/Helpers.scala
index 4085dbf0..66132ace 100644
--- a/core/src/test/scala/backbone/testutil/Helpers.scala
+++ b/core/src/test/scala/backbone/testutil/Helpers.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.testutil
 
 import backbone.consumer.JsonReader
diff --git a/core/src/test/scala/backbone/testutil/TestJsonReader.scala b/core/src/test/scala/backbone/testutil/TestJsonReader.scala
index 1d9fff81..6112f50c 100644
--- a/core/src/test/scala/backbone/testutil/TestJsonReader.scala
+++ b/core/src/test/scala/backbone/testutil/TestJsonReader.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.testutil
 
 import backbone.consumer.JsonReader
diff --git a/gson/src/main/scala/backbone/gson/GsonJsonReader.scala b/gson/src/main/scala/backbone/gson/GsonJsonReader.scala
index 36e56c8e..9b735a02 100644
--- a/gson/src/main/scala/backbone/gson/GsonJsonReader.scala
+++ b/gson/src/main/scala/backbone/gson/GsonJsonReader.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/gson/src/test/scala/backbone/gson/GsonJsonReaderSpec.scala b/gson/src/test/scala/backbone/gson/GsonJsonReaderSpec.scala
index a45881d2..f71e07ef 100644
--- a/gson/src/test/scala/backbone/gson/GsonJsonReaderSpec.scala
+++ b/gson/src/test/scala/backbone/gson/GsonJsonReaderSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.gson
 
 import backbone.consumer.JsonReader
diff --git a/integration-test/src/main/scala/backbone/it/BackboneConsumerPublisherDemoApp.scala b/integration-test/src/main/scala/backbone/it/BackboneConsumerPublisherDemoApp.scala
index a6d16fe3..26fb37f6 100644
--- a/integration-test/src/main/scala/backbone/it/BackboneConsumerPublisherDemoApp.scala
+++ b/integration-test/src/main/scala/backbone/it/BackboneConsumerPublisherDemoApp.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/integration-test/src/main/scala/backbone/it/BackboneCoreDemoApp.scala b/integration-test/src/main/scala/backbone/it/BackboneCoreDemoApp.scala
index 54adb432..7f65245d 100644
--- a/integration-test/src/main/scala/backbone/it/BackboneCoreDemoApp.scala
+++ b/integration-test/src/main/scala/backbone/it/BackboneCoreDemoApp.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/playJson/src/main/scala/backbone/playjson/PlayJsonReader.scala b/playJson/src/main/scala/backbone/playjson/PlayJsonReader.scala
index 4d79f9b6..354ad874 100644
--- a/playJson/src/main/scala/backbone/playjson/PlayJsonReader.scala
+++ b/playJson/src/main/scala/backbone/playjson/PlayJsonReader.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/playJson/src/test/scala/backbone/playjson/PlayJsonReaderSpec.scala b/playJson/src/test/scala/backbone/playjson/PlayJsonReaderSpec.scala
index 44fff026..06c26f4b 100644
--- a/playJson/src/test/scala/backbone/playjson/PlayJsonReaderSpec.scala
+++ b/playJson/src/test/scala/backbone/playjson/PlayJsonReaderSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.playjson
 
 import backbone.consumer.JsonReader
diff --git a/publisher/src/main/scala/backbone/MessageWriter.scala b/publisher/src/main/scala/backbone/MessageWriter.scala
index 7bd6e4ff..3bea3afc 100644
--- a/publisher/src/main/scala/backbone/MessageWriter.scala
+++ b/publisher/src/main/scala/backbone/MessageWriter.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/main/scala/backbone/publisher/DefaultMessageWriters.scala b/publisher/src/main/scala/backbone/publisher/DefaultMessageWriters.scala
index 3a94b8f3..ad4f7358 100644
--- a/publisher/src/main/scala/backbone/publisher/DefaultMessageWriters.scala
+++ b/publisher/src/main/scala/backbone/publisher/DefaultMessageWriters.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/main/scala/backbone/publisher/MessageHeaders.scala b/publisher/src/main/scala/backbone/publisher/MessageHeaders.scala
index 80e05a06..fb0eb10a 100644
--- a/publisher/src/main/scala/backbone/publisher/MessageHeaders.scala
+++ b/publisher/src/main/scala/backbone/publisher/MessageHeaders.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/main/scala/backbone/publisher/Settings.scala b/publisher/src/main/scala/backbone/publisher/Settings.scala
index 4f666707..bfcefc9b 100644
--- a/publisher/src/main/scala/backbone/publisher/Settings.scala
+++ b/publisher/src/main/scala/backbone/publisher/Settings.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/main/scala/backbone/publisher/javadsl/Publisher.scala b/publisher/src/main/scala/backbone/publisher/javadsl/Publisher.scala
index 8cefe9aa..37e8a9e0 100644
--- a/publisher/src/main/scala/backbone/publisher/javadsl/Publisher.scala
+++ b/publisher/src/main/scala/backbone/publisher/javadsl/Publisher.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/main/scala/backbone/publisher/package.scala b/publisher/src/main/scala/backbone/publisher/package.scala
index 7bf65625..c9a6d884 100644
--- a/publisher/src/main/scala/backbone/publisher/package.scala
+++ b/publisher/src/main/scala/backbone/publisher/package.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
@@ -22,7 +22,7 @@
 package backbone
 
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/main/scala/backbone/publisher/scaladsl/Publisher.scala b/publisher/src/main/scala/backbone/publisher/scaladsl/Publisher.scala
index 0db935d1..429d1482 100644
--- a/publisher/src/main/scala/backbone/publisher/scaladsl/Publisher.scala
+++ b/publisher/src/main/scala/backbone/publisher/scaladsl/Publisher.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/publisher/src/test/scala/backbone/publisher/DefaultMessageWritersSpec.scala b/publisher/src/test/scala/backbone/publisher/DefaultMessageWritersSpec.scala
index 190f9f37..e158551d 100644
--- a/publisher/src/test/scala/backbone/publisher/DefaultMessageWritersSpec.scala
+++ b/publisher/src/test/scala/backbone/publisher/DefaultMessageWritersSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.publisher
 
 import backbone.MessageWriter
diff --git a/publisher/src/test/scala/backbone/publisher/scaladsl/PublisherSpec.scala b/publisher/src/test/scala/backbone/publisher/scaladsl/PublisherSpec.scala
index 6b7656c2..b2695673 100644
--- a/publisher/src/test/scala/backbone/publisher/scaladsl/PublisherSpec.scala
+++ b/publisher/src/test/scala/backbone/publisher/scaladsl/PublisherSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2024 Backbone contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package backbone.publisher.scaladsl
 
 import akka.Done
diff --git a/testutils/src/main/scala/backbone/testutil/BaseTest.scala b/testutils/src/main/scala/backbone/testutil/BaseTest.scala
index b5314b35..f022297e 100644
--- a/testutils/src/main/scala/backbone/testutil/BaseTest.scala
+++ b/testutils/src/main/scala/backbone/testutil/BaseTest.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/testutils/src/main/scala/backbone/testutil/ElasticMQ.scala b/testutils/src/main/scala/backbone/testutil/ElasticMQ.scala
index a4e81111..d97dffe9 100644
--- a/testutils/src/main/scala/backbone/testutil/ElasticMQ.scala
+++ b/testutils/src/main/scala/backbone/testutil/ElasticMQ.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in
diff --git a/testutils/src/main/scala/backbone/testutil/TestActorSystem.scala b/testutils/src/main/scala/backbone/testutil/TestActorSystem.scala
index cacd45e6..2ee345aa 100644
--- a/testutils/src/main/scala/backbone/testutil/TestActorSystem.scala
+++ b/testutils/src/main/scala/backbone/testutil/TestActorSystem.scala
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Backbone contributors
+ * Copyright (c) 2024 Backbone contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
  * this software and associated documentation files (the "Software"), to deal in