diff --git a/src/multi_field.py b/src/multi_field.py
index 0d258b560f57ecc1a46d9ceefdeefb998bda4b1d..ca98c04080df51a8b1b9efb9d211d5490df9bd68 100644
--- a/src/multi_field.py
+++ b/src/multi_field.py
@@ -11,7 +11,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Copyright(C) 2013-2020 Max-Planck-Society
+# Copyright(C) 2013-2021 Max-Planck-Society
 #
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.
 
diff --git a/src/operators/sampling_enabler.py b/src/operators/sampling_enabler.py
index 02b71cb4c242965e4fdcdba2e36a2dfb6efe1a3e..24acdb3ab45f4eda6b6bef5b8859095189a40663 100644
--- a/src/operators/sampling_enabler.py
+++ b/src/operators/sampling_enabler.py
@@ -11,7 +11,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Copyright(C) 2013-2020 Max-Planck-Society
+# Copyright(C) 2013-2021 Max-Planck-Society
 #
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.
 
diff --git a/src/operators/sandwich_operator.py b/src/operators/sandwich_operator.py
index dcbed8e1f90626b99c41ca0f71e5141df84091c2..ffc03dfbccbe4598ac16604bc97a622ceadbf903 100644
--- a/src/operators/sandwich_operator.py
+++ b/src/operators/sandwich_operator.py
@@ -11,7 +11,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Copyright(C) 2013-2019 Max-Planck-Society
+# Copyright(C) 2013-2021 Max-Planck-Society
 #
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.
 
diff --git a/test/test_operators/test_simplification.py b/test/test_operators/test_simplification.py
index 3f6dc3deca8f1a14271e2f20b386996173e7678a..06ab5e4946f891d8fd2617f0e11865473f2665c4 100644
--- a/test/test_operators/test_simplification.py
+++ b/test/test_operators/test_simplification.py
@@ -11,7 +11,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Copyright(C) 2013-2019 Max-Planck-Society
+# Copyright(C) 2013-2021 Max-Planck-Society
 #
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.
 
diff --git a/test/test_sugar.py b/test/test_sugar.py
index 722e9ae39f87e1aa4d391ba96803ccd9c7f8a71d..b4f1323d0d6ba510db1015021f86c1116145cbfe 100644
--- a/test/test_sugar.py
+++ b/test/test_sugar.py
@@ -11,7 +11,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-# Copyright(C) 2013-2019 Max-Planck-Society
+# Copyright(C) 2013-2021 Max-Planck-Society
 #
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.