diff --git a/pins/iohk-nix-src.json b/pins/iohk-nix-src.json
index 7ce8f3e..c56cb40 100644
--- a/pins/iohk-nix-src.json
+++ b/pins/iohk-nix-src.json
@@ -1,7 +1,7 @@
 {
   "url": "https://github.com/input-output-hk/iohk-nix",
-  "rev": "4608304d2e02f0f8384d3aa7b7d89ffd2929dab7",
-  "date": "2019-05-15T17:20:14+08:00",
-  "sha256": "0kcaw0dan3gq7gigymgi96sgn46ibw6mgq5phz24jczn5ghsiai0",
+  "rev": "878d54831829175c5b2100f8df842ad466c015f7",
+  "date": "2019-05-16T16:19:30+08:00",
+  "sha256": "02ig850r3bdns1fzlf91bv04wvqibb53x58scildsz5fil1q9hyc",
   "fetchSubmodules": false
 }
diff --git a/pins/nixpkgs-src.json b/pins/nixpkgs-src.json
index a542a1e..5a68efd 100644
--- a/pins/nixpkgs-src.json
+++ b/pins/nixpkgs-src.json
@@ -1,7 +1,7 @@
 {
   "url": "https://github.com/input-output-hk/nixpkgs",
-  "rev": "c96f5924811f5a8576c9f03d3a630c491fbaf7a3",
-  "date": "2019-05-10T15:32:41+08:00",
-  "sha256": "0iagdz0q37ffkpzyh2f21wjb7x4gx257adlranchzc43460x65c1",
+  "rev": "4d29a3148c22967a440badbe7168f55efde4fa8f",
+  "date": "2019-05-16T16:13:21+08:00",
+  "sha256": "0lcibrzxdhmz4dk8d39vnhrwjvqf1k8djwwy7pvkg3bq23sw9mgd",
   "fetchSubmodules": false
 }
diff --git a/release.nix b/release.nix
index 3cb554f..41c5cf6 100644
--- a/release.nix
+++ b/release.nix
@@ -3,10 +3,13 @@ let
 
   # fetch nixpkgs. iohk hydra doesn't provide <nixpkgs>, so we'll have to use
   # a pinned one.
-  pkgs = importPinned "nixpkgs" {};
+  pkgs = importPinned "nixpkgs" { };
 
   # cross system settings
   mingwW64 = pkgs.lib.systems.examples.mingwW64;
+  arm32 = pkgs.lib.systems.examples.raspberryPi;
+  arm64 = pkgs.lib.systems.examples.aarch64-multiplatform;
+  js = pkgs.lib.systems.examples.ghcjs;
 
   # import iohk-nix with the same pin as the nixpkgs above.
   config = { allowUnfree = false; inHydra = true; allowUnsupportedSystem = true; };
@@ -23,6 +26,15 @@ let
   x86_64-mingw32 = importPinned "iohk-nix"
     { inherit config; nixpkgsJsonOverride = ./pins/nixpkgs-src.json; system = "x86_64-linux"; crossSystem = mingwW64; };
 
+  arm32-linux = importPinned "iohk-nix"
+    { inherit config; nixpkgsJsonOverride = ./pins/nixpkgs-src.json; system = "x86_64-linux"; crossSystem = arm32; };
+
+  arm64-linux = importPinned "iohk-nix"
+    { inherit config; nixpkgsJsonOverride = ./pins/nixpkgs-src.json; system = "x86_64-linux"; crossSystem = arm64; };
+
+  js-ghcjs = importPinned "iohk-nix"
+    { inherit config; nixpkgsJsonOverride = ./pins/nixpkgs-src.json; system = "x86_64-linux"; crossSystem = js; };
+
   # jobs contain a key -> value mapping that tells hydra which
   # derivations to build.  There are some predefined helpers in
   # https://github.com/NixOS/nixpkgs/tree/master/pkgs/build-support/release
@@ -47,6 +59,9 @@ let
     # linux -> win32
     # Note: we want to build the cross-compiler. As such we want something from the buildPackages!
     "${mingwW64.config}-ghc864".x86_64-linux = x86_64-mingw32.pkgs.buildPackages.haskell.compiler.ghc864;
+    "${arm32.config}-ghc864".x86_64-linux = arm32-linux.pkgs.buildPackages.haskell.compiler.ghc864;
+    "${arm64.config}-ghc864".x86_64-linux = arm64-linux.pkgs.buildPackages.haskell.compiler.ghc864;
+    "${js.config}-ghc864".x86_64-linux = js-ghcjs.pkgs.buildPackages.haskell.compiler.ghc864;
   };
 in
   jobs