diff --git a/COPYRIGHT.md b/COPYRIGHT.md
new file mode 100644
index 0000000..9809de5
--- /dev/null
+++ b/COPYRIGHT.md
@@ -0,0 +1 @@
+Copyright © 2011-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
\ No newline at end of file
diff --git a/README.md b/README.md
index 213e5a5..49cfae2 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,6 @@ Mixlib::ShellOut does a standard fork/exec on Unix, and uses the Win32 API on Wi
 For information on contributing to this project see <https://github.com/chef/chef/blob/master/CONTRIBUTING.md>
 
 ## License
-- Copyright:: Copyright (c) 2011-2016 Chef Software, Inc.
 - License:: Apache License, Version 2.0
 
 ```text
@@ -97,3 +96,6 @@ 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.
 ```
+# Copyright
+
+See [COPYRIGHT.md](./COPYRIGHT.md).
\ No newline at end of file
diff --git a/lib/mixlib/shellout.rb b/lib/mixlib/shellout.rb
index b16c050..9676302 100644
--- a/lib/mixlib/shellout.rb
+++ b/lib/mixlib/shellout.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 #--
 # Author:: Daniel DeLeo (<dan@chef.io>)
-# Copyright:: Copyright (c) Chef Software Inc.
+# Copyright:: Copyright (c) 2011-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/lib/mixlib/shellout/helper.rb b/lib/mixlib/shellout/helper.rb
index e1cb2f2..ff45bd5 100644
--- a/lib/mixlib/shellout/helper.rb
+++ b/lib/mixlib/shellout/helper.rb
@@ -1,6 +1,6 @@
 #--
 # Author:: Daniel DeLeo (<dan@chef.io>)
-# Copyright:: Copyright (c) Chef Software Inc.
+# Copyright:: Copyright (c) 2011-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/lib/mixlib/shellout/unix.rb b/lib/mixlib/shellout/unix.rb
index 369e8be..a2b918b 100644
--- a/lib/mixlib/shellout/unix.rb
+++ b/lib/mixlib/shellout/unix.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 #
 # Author:: Daniel DeLeo (<dan@chef.io>)
-# Copyright:: Copyright (c) Chef Software Inc.
+# Copyright:: Copyright (c) 2011-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/lib/mixlib/shellout/windows.rb b/lib/mixlib/shellout/windows.rb
index 9d87bca..7eba0c8 100644
--- a/lib/mixlib/shellout/windows.rb
+++ b/lib/mixlib/shellout/windows.rb
@@ -4,7 +4,7 @@
 # Author:: Daniel DeLeo (<dan@chef.io>)
 # Author:: John Keiser (<jkeiser@chef.io>)
 # Author:: Ho-Sheng Hsiao (<hosh@chef.io>)
-# Copyright:: Copyright (c) Chef Software Inc.
+# Copyright:: Copyright (c) 2011-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/lib/mixlib/shellout/windows/core_ext.rb b/lib/mixlib/shellout/windows/core_ext.rb
index bfa7315..7186560 100644
--- a/lib/mixlib/shellout/windows/core_ext.rb
+++ b/lib/mixlib/shellout/windows/core_ext.rb
@@ -1,7 +1,7 @@
 #
 # Author:: Daniel DeLeo (<dan@chef.io>)
 # Author:: John Keiser (<jkeiser@chef.io>)
-# Copyright:: Copyright (c) Chef Software Inc.
+# Copyright:: Copyright (c) 2011-2025 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
 # License:: Apache License, Version 2.0
 #
 # Licensed under the Apache License, Version 2.0 (the "License");