diff --git a/.travis.yml b/.travis.yml
index bd70b40..43c1335 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,3 +9,4 @@ before_script:
 
 script:
   - nix-build ./release.nix --option trusted-public-keys "masser-ebook-manager.cachix.org-1:mtFSkQ2MO5MvjUpulZoFKjKUIa8g8CTcdPVuJaPKS1w= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" --option binary-caches "https://cache.nixos.org https://masser-ebook-manager.cachix.org" -A ghc.backend -A ghc.frontend
+  - nix-build ./release.nix --option trusted-public-keys "masser-ebook-manager.cachix.org-1:mtFSkQ2MO5MvjUpulZoFKjKUIa8g8CTcdPVuJaPKS1w= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" --option binary-caches "https://cache.nixos.org https://masser-ebook-manager.cachix.org" -A ghcjs.frontend
diff --git a/default.nix b/default.nix
index ed703ab..47275d6 100644
--- a/default.nix
+++ b/default.nix
@@ -17,6 +17,7 @@ let
 in
 
 (import ./project.nix nixpkgs) {
+  haskellPackages = haskellPackages;
   packages = {
     common = ./common;
     backend = ./backend;
diff --git a/project.nix b/project.nix
index 079c033..8301d39 100644
--- a/project.nix
+++ b/project.nix
@@ -6,7 +6,8 @@ let
 
 in
 
-{ packages
+{ haskellPackages
+, packages
 , overrides ? _ : _ : {}
 , tools ? []
 }:
@@ -14,15 +15,15 @@ in
 let
 
   overrides' = nixpkgs.lib.foldr nixpkgs.lib.composeExtensions (_: _: {}) [
-    (self: super: mapAttrs (name: path: self.callCabal2nix name path {}) packages)
+    (self: super: mapAttrs (name: path: nixpkgs.haskellPackages.callCabal2nix name path {}) packages)
     overrides
   ];
-  haskellPackages = nixpkgs.haskellPackages.override { overrides = overrides'; };
-  packages' = mapAttrs (name: _: haskellPackages."${name}") packages;
+  haskellPackages' = haskellPackages.override { overrides = overrides'; };
+  packages' = mapAttrs (name: _: haskellPackages'."${name}") packages;
   mkShell = name: pkg:
   let
     n =  "${name}-shell";
-    deps = haskellPackages.ghcWithHoogle (pkgs: pkg.buildInputs ++ pkg.propagatedBuildInputs);
+    deps = haskellPackages'.ghcWithHoogle (pkgs: pkg.buildInputs ++ pkg.propagatedBuildInputs);
   in
   {
     name = "${n}";
diff --git a/release.nix b/release.nix
index afd47d4..db007a4 100644
--- a/release.nix
+++ b/release.nix
@@ -12,4 +12,7 @@ let
 
   in
 
-import ./default.nix { nixpkgs = pinnedPkgs; haskellPackages = pinnedPkgs.haskellPackages; }
+{
+  ghc = import ./default.nix { nixpkgs = pinnedPkgs; haskellPackages = pinnedPkgs.haskell.packages.ghc843; };
+  ghcjs = import ./default.nix { nixpkgs = pinnedPkgs; haskellPackages = pinnedPkgs.haskell.packages.ghcjs84; };
+}