diff --git a/.golangci.yml b/.golangci.yml
index 9f437d5..4d6d74f 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -135,6 +135,24 @@ linters-settings:
         json: snake
         yaml: snake
 
+  goheader:
+    values:
+      regexp:
+        YEARS: '(20\d\d - 20\d\d|20\d\d, 20\d\d|20\d\d)'
+    template: |-
+      Copyright © {{ YEARS }} Attestant Limited.
+      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.
+
 linters:
   # Enable all available linters.
   # Default: false
diff --git a/services/accountmanager/utils/utils.go b/services/accountmanager/utils/utils.go
index 1338380..f7995af 100644
--- a/services/accountmanager/utils/utils.go
+++ b/services/accountmanager/utils/utils.go
@@ -1,3 +1,16 @@
+// Copyright © 2022 Attestant Limited.
+// 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.
+
 package utils
 
 import apiv1 "github.com/attestantio/go-eth2-client/api/v1"
diff --git a/services/blockrelay/v2/baserelayconfig.go b/services/blockrelay/v2/baserelayconfig.go
index e7f2fa3..3df48ce 100644
--- a/services/blockrelay/v2/baserelayconfig.go
+++ b/services/blockrelay/v2/baserelayconfig.go
@@ -1,4 +1,4 @@
-// Copyright © 2022 Atestant Limited.
+// Copyright © 2022 Attestant Limited.
 // 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
diff --git a/services/blockrelay/v2/proposerrelayconfig.go b/services/blockrelay/v2/proposerrelayconfig.go
index 18ab3fe..5828490 100644
--- a/services/blockrelay/v2/proposerrelayconfig.go
+++ b/services/blockrelay/v2/proposerrelayconfig.go
@@ -1,4 +1,4 @@
-// Copyright © 2022 Atestant Limited.
+// Copyright © 2022 Attestant Limited.
 // 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
diff --git a/testutil/bytes.go b/testutil/bytes.go
index d46a25e..2639f3e 100644
--- a/testutil/bytes.go
+++ b/testutil/bytes.go
@@ -1,4 +1,4 @@
-// Copyright © 2020 Attestant Limited
+// Copyright © 2020 Attestant Limited.
 // 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
diff --git a/testutil/committees.go b/testutil/committees.go
index 44ce4de..27c89e5 100644
--- a/testutil/committees.go
+++ b/testutil/committees.go
@@ -9,7 +9,7 @@
 // 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
+// limitations under the License.
 
 package testutil