diff --git a/pkgs/development/libraries/haskell/Cabal/1.20.0.0.nix b/pkgs/development/libraries/haskell/Cabal/1.20.0.0.nix
new file mode 100644
index 000000000000..0dbd2acdd92c
--- /dev/null
+++ b/pkgs/development/libraries/haskell/Cabal/1.20.0.0.nix
@@ -0,0 +1,26 @@
+{ cabal, deepseq, extensibleExceptions, filepath, HUnit, QuickCheck
+, regexPosix, testFramework, testFrameworkHunit
+, testFrameworkQuickcheck2, time
+}:
+
+cabal.mkDerivation (self: {
+  pname = "Cabal";
+  version = "1.20.0.0";
+  sha256 = "1m2lp6v1959mdm9zfg6fg1xw2iv749r4rzj576lqvn66slwsjpw1";
+  buildDepends = [ deepseq filepath time ];
+  testDepends = [
+    extensibleExceptions filepath HUnit QuickCheck regexPosix
+    testFramework testFrameworkHunit testFrameworkQuickcheck2
+  ];
+  doCheck = false;
+  meta = {
+    homepage = "http://www.haskell.org/cabal/";
+    description = "A framework for packaging Haskell software";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [
+      self.stdenv.lib.maintainers.andres
+      self.stdenv.lib.maintainers.simons
+    ];
+  };
+})
diff --git a/pkgs/tools/package-management/cabal-install/1.20.0.0.nix b/pkgs/tools/package-management/cabal-install/1.20.0.0.nix
new file mode 100644
index 000000000000..0c7bd5f473cd
--- /dev/null
+++ b/pkgs/tools/package-management/cabal-install/1.20.0.0.nix
@@ -0,0 +1,30 @@
+{ cabal, Cabal, filepath, HTTP, HUnit, mtl, network, QuickCheck
+, random, stm, testFramework, testFrameworkHunit
+, testFrameworkQuickcheck2, time, zlib
+}:
+
+cabal.mkDerivation (self: {
+  pname = "cabal-install";
+  version = "1.20.0.0";
+  sha256 = "0m05wjmi8b07xzri3d7y7bwcxmd1asj3kcg9c1idhjwmg2nla2dz";
+  isLibrary = false;
+  isExecutable = true;
+  buildDepends = [
+    Cabal filepath HTTP mtl network random stm time zlib
+  ];
+  testDepends = [
+    Cabal filepath HTTP HUnit mtl network QuickCheck stm testFramework
+    testFrameworkHunit testFrameworkQuickcheck2 time zlib
+  ];
+  postInstall = ''
+    mkdir $out/etc
+    mv bash-completion $out/etc/bash_completion.d
+  '';
+  meta = {
+    homepage = "http://www.haskell.org/cabal/";
+    description = "The command-line interface for Cabal and Hackage";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [ self.stdenv.lib.maintainers.andres ];
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index ca8b58226a13..3e4d410a154a 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -714,6 +714,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   Cabal_1_14_0 = callPackage ../development/libraries/haskell/Cabal/1.14.0.nix { cabal = self.cabal.override { Cabal = null; }; };
   Cabal_1_16_0_3 = callPackage ../development/libraries/haskell/Cabal/1.16.0.3.nix { cabal = self.cabal.override { Cabal = null; }; };
   Cabal_1_18_1_3 = callPackage ../development/libraries/haskell/Cabal/1.18.1.3.nix { cabal = self.cabal.override { Cabal = null; }; };
+  Cabal_1_20_0_0 = callPackage ../development/libraries/haskell/Cabal/1.20.0.0.nix { cabal = self.cabal.override { Cabal = null; }; };
   Cabal = null; # core package in GHC
 
   cabalFileTh = callPackage ../development/libraries/haskell/cabal-file-th {};
@@ -3047,6 +3048,9 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
   cabalInstall_1_18_0_3 = callPackage ../tools/package-management/cabal-install/1.18.0.3.nix {
     Cabal = self.Cabal_1_18_1_3;
   };
+  cabalInstall_1_20_0_0 = callPackage ../tools/package-management/cabal-install/1.20.0.0.nix {
+    Cabal = self.Cabal_1_20_0_0;
+  };
   cabalInstall = self.cabalInstall_1_18_0_3;
 
   gitAnnex = callPackage ../applications/version-management/git-and-tools/git-annex {