diff --git a/pkgs/development/compilers/elm/default.nix b/pkgs/development/compilers/elm/default.nix
index 53ccb57abe6b..369ea8626204 100644
--- a/pkgs/development/compilers/elm/default.nix
+++ b/pkgs/development/compilers/elm/default.nix
@@ -30,18 +30,6 @@ let
             `package/nix/build.sh`
             */
             elm-format = justStaticExecutables (overrideCabal (self.callPackage ./packages/elm-format.nix {}) (drv: {
-              # GHC 8.8.3 support
-              # https://github.com/avh4/elm-format/pull/640
-              patches = [(
-                fetchpatch {
-                  url = "https://github.com/turboMaCk/elm-format/commit/4f4abdc7117ed6ce3335f6cf39b6495b48067b7c.patch";
-                  sha256 = "1zqk6q6w0ph12mnwffgwzf4h1hcgqg0v09ws9q2g5bg2riq4rvd9";
-                }
-              )];
-              # Tests are failing after upgrade to ghc881.
-              # Cause is probably just a minor change in stdout output
-              # see https://github.com/avh4/elm-format/pull/640
-              doCheck = false;
               jailbreak = true;
             }));
 
diff --git a/pkgs/development/compilers/elm/packages/elm-format.nix b/pkgs/development/compilers/elm/packages/elm-format.nix
index e498b4b1494f..ff944cc4b647 100644
--- a/pkgs/development/compilers/elm/packages/elm-format.nix
+++ b/pkgs/development/compilers/elm/packages/elm-format.nix
@@ -1,4 +1,4 @@
-{ mkDerivation, fetchgit, ansi-terminal, ansi-wl-pprint, base, binary
+{ mkDerivation, fetchgit, ansi-terminal, ansi-wl-pprint, array, base, binary
 , bytestring, cmark, containers, directory, filepath, free, HUnit
 , indents, json, mtl, optparse-applicative, parsec, process
 , QuickCheck, quickcheck-io, split, stdenv, tasty, tasty-golden
@@ -6,11 +6,11 @@
 }:
 mkDerivation {
   pname = "elm-format";
-  version = "0.8.3";
+  version = "0.8.4";
   src = fetchgit {
     url = "https://github.com/avh4/elm-format";
-    sha256 = "0n6lrqj6mq044hdyraj3ss5cg74dn8k4z05xmwn2apjpm146iaw8";
-    rev = "b97e3593d564a1e069c0a022da8cbd98ca2c5a4b";
+    sha256 = "0cxlhhdjx4h9g03z83pxv91qrysbi0ab92rl52jb0yvkaix989ai";
+    rev = "5bd4fbe591fe8b456160c180cb875ef60bc57890";
   };
   postPatch = ''
     mkdir -p ./generated
@@ -18,15 +18,15 @@ mkDerivation {
     module Build_elm_format where
 
     gitDescribe :: String
-    gitDescribe = "0.8.3"
+    gitDescribe = "0.8.4"
     EOHS
   '';
   isLibrary = false;
   isExecutable = true;
   libraryHaskellDepends = [
-    ansi-terminal ansi-wl-pprint base binary bytestring containers
-    directory filepath free indents json mtl optparse-applicative
-    parsec process split text
+    ansi-terminal ansi-wl-pprint array base binary bytestring
+    containers directory filepath free indents json mtl
+    optparse-applicative parsec process split text
   ];
   executableHaskellDepends = [ base ];
   testHaskellDepends = [