diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
index 64d4e277d4c..0948a70a5c7 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.4.x.nix
@@ -193,28 +193,6 @@ self: super: {
     libraryHaskellDepends = (drv.libraryHaskellDepends or []) ++ (with self; [ data-or ]);
   });
 
-  ## Unmerged.  PR: https://github.com/dhall-lang/dhall-haskell/pull/321
-  dhall = overrideCabal super.dhall (drv: {
-    ##     • No instance for (Semigroup (Parser Builder))
-    ##         arising from a use of ‘<>’
-    ##       There are instances for similar types:
-    src = pkgs.fetchFromGitHub {
-      owner  = "deepfire";
-      repo   = "dhall-haskell";
-      rev    = "38f3d8c861e137da6d8ac8eab88aec1c359efcac";
-      sha256 = "1pya7lhdjsygk622k1g3whj0a7jqwyym26ikxbn1anxypnb0n2wy";
-    };
-    ## Setup: Encountered missing dependencies:
-    ## prettyprinter >=1.2.0.1 && <1.3
-    jailbreak       = true;
-    ## Setup: Encountered missing dependencies:
-    ## insert-ordered-containers -any,
-    ## lens-family-core -any,
-    ## prettyprinter-ansi-terminal -any,
-    ## repline -any
-    libraryHaskellDepends = (drv.libraryHaskellDepends or []) ++ (with self; [ insert-ordered-containers lens-family-core prettyprinter prettyprinter-ansi-terminal repline ]);
-  });
-
   ## Unmerged.  PR: https://github.com/gregorycollins/hashtables/pull/46
   hashtables = overrideCabal super.hashtables (drv: {
     ##     • No instance for (Semigroup Slot)
@@ -497,6 +475,7 @@ self: super: {
   matrix = self.matrix_0_3_6_1;
   pandoc = self.pandoc_2_2;
   pandoc-types = self.pandoc-types_1_17_4_2;
+  dhall = self.dhall_1_13_0;
 
   # https://github.com/xmonad/xmonad/issues/155
   xmonad = addBuildDepend (appendPatch super.xmonad (pkgs.fetchpatch