diff --git a/LICENSE b/LICENSE
index ecedc15b0..90c0ff936 100644
--- a/LICENSE
+++ b/LICENSE
@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright (c) 2018 by Contributors
+   Copyright (c) 2019 by Contributors
 
    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/doc/conf.py b/doc/conf.py
index 167db643e..8a40da042 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -58,7 +58,7 @@ for mod_name in MOCK_MODULES:
 # General information about the project.
 project = u'xgboost'
 author = u'%s developers' % project
-copyright = u'2016, %s' % author
+copyright = u'2019, %s' % author
 github_doc_root = 'https://github.com/dmlc/xgboost/tree/master/doc/'
 
 os.environ['XGBOOST_BUILD_DOC'] = '1'
diff --git a/tests/cpp/helpers.h b/tests/cpp/helpers.h
index a2a9f5d68..679e8952d 100644
--- a/tests/cpp/helpers.h
+++ b/tests/cpp/helpers.h
@@ -1,5 +1,5 @@
 /*!
- * Copyright 2016-2018 XGBoost contributors
+ * Copyright 2016-2019 XGBoost contributors
  */
 #ifndef XGBOOST_TESTS_CPP_HELPERS_H_
 #define XGBOOST_TESTS_CPP_HELPERS_H_