diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,7 @@
 # Changelog for gray-extended
 
+1.5.6 Corrected copyright info.
+
 1.5.5 Revamped to work with Nix + cabal-install
 
 1.5.4 Revamped to work with Nix + Stack.
diff --git a/gray-extended.cabal b/gray-extended.cabal
--- a/gray-extended.cabal
+++ b/gray-extended.cabal
@@ -1,7 +1,7 @@
-cabal-version: 1.12
+cabal-version: 1.13
 
 name:           gray-extended
-version:        1.5.5
+version:        1.5.6
 synopsis:       Gray encoding schemes
 description:    Please see the README on GitHub at <https://github.com/mhwombat/gray-extended#readme>
 category:       Math
@@ -9,7 +9,7 @@
 bug-reports:    https://github.com/mhwombat/gray-extended/issues
 author:         Amy de Buitléir
 maintainer:     amy@nualeargais.ie
-copyright:     2018-2019 Amy de Buitléir
+copyright:      2010-2019 Amy de Buitléir
 license:        BSD3
 license-file:   LICENSE
 build-type:     Simple