diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,5 +1,5 @@
 Copyright (c) 2014 - 2015 Tim Baumann <tim@timbaumann.info>
-Copyright (c) 2014 - 2017 Alexander Thiemann <mail@athiemann.net>
+Copyright (c) 2014 - 2022 Alexander Thiemann <mail@athiemann.net>
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -19,15 +19,9 @@
 * From Source (cabal): `git clone https://github.com/agrafix/hvect.git && cd hvect && cabal install`
 * From Source (stack): `git clone https://github.com/agrafix/hvect.git && cd hvect && stack build`
 
-
-## Misc
-
-### Supported GHC Versions
-
-* 7.8.4
-* 7.10.2
-
-### License
+## License
 
 Released under the MIT license.
-(c) 2014 - 2016 Alexander Thiemann <mail@athiemann.net>, Tim Baumann <tim@timbaumann.info>
+(c) 2014 - 2022 Alexander Thiemann <mail@athiemann.net>, Tim Baumann <tim@timbaumann.info>
+
+By contributing to this repository you agree that your contributions will be released under the MIT license.
diff --git a/hvect.cabal b/hvect.cabal
--- a/hvect.cabal
+++ b/hvect.cabal
@@ -1,5 +1,5 @@
 name:                hvect
-version:             0.4.0.0
+version:             0.4.0.1
 synopsis:            Simple strict heterogeneous lists
 description:         Small, concise and simple implementation of heterogeneous lists with useful utility functions
 homepage:            https://github.com/agrafix/hvect
@@ -8,11 +8,11 @@
 license-file:        LICENSE
 author:              Alexander Thiemann <mail@athiemann.net>, Tim Baumann <tim@timbaumann.info>
 maintainer:          Alexander Thiemann <mail@athiemann.net>
-copyright:           (c) 2014 - 2017 Alexander Thiemann <mail@athiemann.net>, Tim Baumann <tim@timbaumann.info>
+copyright:           (c) 2014 - 2022 Alexander Thiemann <mail@athiemann.net>, Tim Baumann <tim@timbaumann.info>
 category:            Data
 build-type:          Simple
 cabal-version:       >=1.10
-tested-with:         GHC==7.10.2, GHC==8.0.1
+tested-with:         GHC==8.10.7, GHC==9.2
 extra-source-files:
     README.md
 
diff --git a/src/Data/HVect.hs b/src/Data/HVect.hs
--- a/src/Data/HVect.hs
+++ b/src/Data/HVect.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts#-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE KindSignatures #-}