diff --git a/field-converter.go b/field-converter.go
index c0afdb0..8a0d737 100644
--- a/field-converter.go
+++ b/field-converter.go
@@ -1,3 +1,8 @@
+// Copyright © 2020 Mike Berezin
+//
+// Use of this source code is governed by an MIT license.
+// Details in the LICENSE file.
+
 package airtable
 
 import (
diff --git a/field-converter_test.go b/field-converter_test.go
index 03d1784..28058d1 100644
--- a/field-converter_test.go
+++ b/field-converter_test.go
@@ -1,3 +1,8 @@
+// Copyright © 2020 Mike Berezin
+//
+// Use of this source code is governed by an MIT license.
+// Details in the LICENSE file.
+
 package airtable
 
 import (
diff --git a/go.mod b/go.mod
index 7937559..2eb8607 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/mehanizm/airtable
 
-go 1.15
+go 1.18