diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/api/functions/DefaultKeyCheckable.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/api/functions/DefaultKeyCheckable.java
index 6bd287fb3d5c..1669b30f7b46 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/api/functions/DefaultKeyCheckable.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/api/functions/DefaultKeyCheckable.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithId.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithId.java
index d6b7ccd8e578..d06ff56a03e9 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithId.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithId.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/CreateElementMappingToSelf.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/CreateElementMappingToSelf.java
index aa8fc28f0e16..355b88970ae1 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/CreateElementMappingToSelf.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/CreateElementMappingToSelf.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/FilterEdgesToGroup.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/FilterEdgesToGroup.java
index 2f6194d07334..699f2da241c4 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/FilterEdgesToGroup.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/FilterEdgesToGroup.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDs.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDs.java
index 0390c1b1cab6..8c8dbdca2c71 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDs.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDs.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTuple.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTuple.java
index 8eaf22e9f500..84b0c32384a8 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTuple.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTuple.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefault.java b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefault.java
index a8ee7e436bc1..c7181ca259aa 100644
--- a/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefault.java
+++ b/gradoop-flink/src/main/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefault.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/KeyedGroupingVertexRetentionTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/KeyedGroupingVertexRetentionTest.java
index 5fc7e8c88694..4781d1c1c0a9 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/KeyedGroupingVertexRetentionTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/KeyedGroupingVertexRetentionTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithIdTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithIdTest.java
index 4d1ebc0d001b..68f611d78ddb 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithIdTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/BuildTuplesFromEdgesWithIdTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDsTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDsTest.java
index ec29b13c87c7..28ba3fdf08e0 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDsTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/PickRetainedEdgeIDsTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTupleTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTupleTest.java
index b4ed71ed7de8..65825df06b03 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTupleTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/functions/UpdateIdFieldAndMarkTupleTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/CompositeKeyFunctionWithDefaultValuesTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/CompositeKeyFunctionWithDefaultValuesTest.java
index 41c3578cc3c9..7b8bd47c3a63 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/CompositeKeyFunctionWithDefaultValuesTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/CompositeKeyFunctionWithDefaultValuesTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/ConstantKeyFunctionTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/ConstantKeyFunctionTest.java
index 82f47661c136..d84659bc2a6f 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/ConstantKeyFunctionTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/ConstantKeyFunctionTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/KeyFunctionTestBase.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/KeyFunctionTestBase.java
index a1b1e3572fbf..3dbba0804855 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/KeyFunctionTestBase.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/KeyFunctionTestBase.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/LabelKeyFunctionTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/LabelKeyFunctionTest.java
index 1c29f5b72b34..f790b981c349 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/LabelKeyFunctionTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/LabelKeyFunctionTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/PropertyKeyFunctionTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/PropertyKeyFunctionTest.java
index a8a02884662a..67a7bc5b1b94 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/PropertyKeyFunctionTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/keys/PropertyKeyFunctionTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefaultTest.java b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefaultTest.java
index ca6af6548781..ad8f028c5cc6 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefaultTest.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/model/impl/operators/keyedgrouping/labelspecific/WithAllKeysSetToDefaultTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2014 - 2020 Leipzig University (Database Research Group)
+ * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.