diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2017 Gabriel Gonzalez
+Copyright (c) 2017 Gabriella Gonzalez
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
@@ -8,7 +8,7 @@
     * Redistributions in binary form must reproduce the above copyright notice,
       this list of conditions and the following disclaimer in the documentation
       and/or other materials provided with the distribution.
-    * Neither the name of Gabriel Gonzalez nor the names of other contributors
+    * Neither the name of Gabriella Gonzalez nor the names of other contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission.
 
diff --git a/nix-derivation.cabal b/nix-derivation.cabal
--- a/nix-derivation.cabal
+++ b/nix-derivation.cabal
@@ -1,14 +1,14 @@
 Name: nix-derivation
-Version: 1.1.2
+Version: 1.1.3
 Cabal-Version: >=1.10
 Build-Type: Simple
 Tested-With: GHC == 7.8.4, GHC == 7.10.3, GHC == 8.0.2, GHC == 8.8.3
 License: BSD3
 License-File: LICENSE
-Copyright: 2017 Gabriel Gonzalez
-Author: Gabriel Gonzalez
-Maintainer: Gabriel439@gmail.com
-Bug-Reports: https://github.com/Gabriel439/Haskell-Nix-Derivation-Library/issues
+Copyright: 2017 Gabriella Gonzalez
+Author: Gabriella Gonzalez
+Maintainer: GenuineGabriella@gmail.com
+Bug-Reports: https://github.com/Gabriella439/Haskell-Nix-Derivation-Library/issues
 Synopsis: Parse and render *.drv files
 Description:
     Use this package to parse and render Nix derivation files (i.e. *.drv files)
@@ -22,7 +22,7 @@
     tests/example1.drv
 Source-Repository head
     Type: git
-    Location: https://github.com/Gabriel439/Haskell-Nix-Derivation-Library
+    Location: https://github.com/Gabriella439/Haskell-Nix-Derivation-Library
 
 Library
     Default-Language: Haskell2010
@@ -30,10 +30,10 @@
     Build-Depends:
         base            >= 4.6.0.0  && < 5   ,
         attoparsec      >= 0.12.0.0 && < 0.15,
-        containers                     < 0.7 ,
-        deepseq         >= 1.4.0.0  && < 1.5 ,
-        text            >= 0.8.0.0  && < 1.3 ,
-        vector                         < 0.13,
+        containers                     < 0.8 ,
+        deepseq         >= 1.4.0.0  && < 1.6 ,
+        text            >= 0.8.0.0  && < 2.2 ,
+        vector                         < 0.14,
         filepath                       < 1.5
     Exposed-Modules:
         Nix.Derivation
@@ -50,7 +50,7 @@
         base           >= 4.6.0.0  && < 5   ,
         attoparsec     >= 0.12.0.0 && < 0.15,
         pretty-show    >= 1.6.11   && < 1.11,
-        text           >= 0.8.0.0  && < 1.3 ,
+        text                                ,
         nix-derivation
     GHC-Options: -Wall
     Main-Is: Main.hs
@@ -65,7 +65,7 @@
         base           >= 4.6.0.0  && < 5   ,
         attoparsec     >= 0.12.0.0 && < 0.15,
         nix-derivation                      ,
-        text           >= 0.8.0.0  && < 1.3
+        text
 
 Test-Suite property
     Default-Language: Haskell2010
@@ -78,8 +78,8 @@
         attoparsec      >= 0.12.0.0 && < 0.15,
         nix-derivation                       ,
         QuickCheck                     < 2.15,
-        text            >= 0.8.0.0  && < 1.3 ,
-        vector                         < 0.13,
+        text                                 ,
+        vector                         < 0.14,
         filepath                       < 1.5
 
 Benchmark benchmark
@@ -92,6 +92,6 @@
     Build-Depends:
         base            >= 4.6.0.0  && < 5   ,
         attoparsec      >= 0.12.0.0 && < 0.15,
-        criterion       >= 1.1.4.0  && < 1.6 ,
+        criterion       >= 1.1.4.0  && < 1.7 ,
         nix-derivation                       ,
-        text            >= 0.8.0.0  && < 1.3
+        text
diff --git a/src/Nix/Derivation/Types.hs b/src/Nix/Derivation/Types.hs
--- a/src/Nix/Derivation/Types.hs
+++ b/src/Nix/Derivation/Types.hs
@@ -1,7 +1,7 @@
-{-# LANGUAGE DeriveGeneric  #-}
-{-# LANGUAGE DeriveFunctor  #-}
-{-# LANGUAGE FlexibleInstances  #-}
-{-# LANGUAGE KindSignatures  #-}
+{-# LANGUAGE DeriveGeneric     #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE KindSignatures    #-}
+{-# LANGUAGE RecordWildCards   #-}
 
 -- | Shared types
 
@@ -12,6 +12,7 @@
     ) where
 
 import Control.DeepSeq (NFData)
+import Data.Bifunctor (Bifunctor(bimap))
 import Data.Map (Map)
 import Data.Set (Set)
 import Data.Vector (Vector)
@@ -50,3 +51,17 @@
     } deriving (Eq, Generic, Ord, Show)
 
 instance (NFData a, NFData b) => NFData (DerivationOutput a b)
+
+instance Functor (DerivationOutput fp) where
+  fmap f DerivationOutput{..} = DerivationOutput
+    { path = path
+    , hashAlgo = f hashAlgo
+    , hash = f hash
+    }
+
+instance Bifunctor DerivationOutput where
+  bimap f g DerivationOutput{..} = DerivationOutput
+    { path = f path
+    , hashAlgo = g hashAlgo
+    , hash = g hash
+    }