diff --git a/pkgs/development/libraries/haskell/Cabal/1.20.0.0.nix b/pkgs/development/libraries/haskell/Cabal/1.20.0.1.nix
similarity index 89%
rename from pkgs/development/libraries/haskell/Cabal/1.20.0.0.nix
rename to pkgs/development/libraries/haskell/Cabal/1.20.0.1.nix
index 0dbd2acdd92c..ee7f363318eb 100644
--- a/pkgs/development/libraries/haskell/Cabal/1.20.0.0.nix
+++ b/pkgs/development/libraries/haskell/Cabal/1.20.0.1.nix
@@ -5,8 +5,8 @@
 
 cabal.mkDerivation (self: {
   pname = "Cabal";
-  version = "1.20.0.0";
-  sha256 = "1m2lp6v1959mdm9zfg6fg1xw2iv749r4rzj576lqvn66slwsjpw1";
+  version = "1.20.0.1";
+  sha256 = "0vcpw4rskqlg2swsxk93p77svb007qvpwlpj2ia55avpi4c3xf8m";
   buildDepends = [ deepseq filepath time ];
   testDepends = [
     extensibleExceptions filepath HUnit QuickCheck regexPosix
diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index d803883413d8..d07544691e66 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -20,8 +20,8 @@
   };
 
   ghc782Prefs = self : super : ghcHEADPrefs self super // {
-    cabalInstall_1_20_0_2 = super.cabalInstall_1_20_0_2.override { Cabal = self.Cabal_1_20_0_0; };
-    codex = super.codex.override { hackageDb = super.hackageDb.override { Cabal = self.Cabal_1_20_0_0; }; };
+    cabalInstall_1_20_0_2 = super.cabalInstall_1_20_0_2.override { Cabal = self.Cabal_1_20_0_1; };
+    codex = super.codex.override { hackageDb = super.hackageDb.override { Cabal = self.Cabal_1_20_0_1; }; };
   };
 
   ghc763Prefs = self : super : ghc782Prefs self super // {
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 9765dc29c3b3..bcead18f6218 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -324,7 +324,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   Cabal_1_14_0 = callPackage ../development/libraries/haskell/Cabal/1.14.0.nix {};
   Cabal_1_16_0_3 = callPackage ../development/libraries/haskell/Cabal/1.16.0.3.nix {};
   Cabal_1_18_1_3 = callPackage ../development/libraries/haskell/Cabal/1.18.1.3.nix {};
-  Cabal_1_20_0_0 = callPackage ../development/libraries/haskell/Cabal/1.20.0.0.nix {};
+  Cabal_1_20_0_1 = callPackage ../development/libraries/haskell/Cabal/1.20.0.1.nix {};
   Cabal = null;                 # core package since forever
 
   cabalFileTh = callPackage ../development/libraries/haskell/cabal-file-th {};
@@ -2740,7 +2740,7 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
   cabalInstall_0_14_0 = callPackage ../tools/package-management/cabal-install/0.14.0.nix {};
   cabalInstall_1_16_0_2 = callPackage ../tools/package-management/cabal-install/1.16.0.2.nix { Cabal = self.Cabal_1_16_0_3; };
   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_2 = callPackage ../tools/package-management/cabal-install/1.20.0.2.nix { Cabal = self.Cabal_1_20_0_0; };
+  cabalInstall_1_20_0_2 = callPackage ../tools/package-management/cabal-install/1.20.0.2.nix { Cabal = self.Cabal_1_20_0_1; };
   cabalInstall = self.cabalInstall_1_20_0_2;
 
   codex = callPackage ../development/tools/haskell/codex {};