diff --git a/.envrc b/.envrc
index 1d953f4..051d09d 100644
--- a/.envrc
+++ b/.envrc
@@ -1 +1 @@
-use nix
+eval "$(lorri direnv)"
diff --git a/.travis.yml b/.travis.yml
index a46b0a4..e84a560 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,18 +1,4 @@
-language: node_js
-dist: trusty
-sudo: required
-node_js: stable
+language: nix
 notifications:
   email: false
-env:
-  - PATH=$HOME/purescript:$PATH
-install:
-  - TAG=$(wget -q -O - https://github.com/purescript/purescript/releases/latest --server-response --max-redirect 0 2>&1 | sed -n -e 's/.*Location:.*tag\///p')
-  - wget -O $HOME/purescript.tar.gz https://github.com/purescript/purescript/releases/download/$TAG/linux64.tar.gz
-  - tar -xvf $HOME/purescript.tar.gz -C $HOME/
-  - chmod a+x $HOME/purescript
-  - npm install -g bower pulp purescript-psa psc-package
-script:
-  - make test
-after_success:
-  - test -n $TRAVIS_TAG && (echo $GITHUB_TOKEN | pulp login) && (yes | pulp publish --no-push)
+script: nix-shell --run 'make test'
diff --git a/shell.nix b/shell.nix
index 37b3ff0..5d34a6a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,16 +1,23 @@
-{
-  purescript ? "0.12.4",
-  nixjs ? fetchTarball "https://github.com/cprussin/nixjs/tarball/release-19.03",
-  nixpkgs ? <nixpkgs>
-}:
+{ sources ? import ./sources.nix }:
 
 let
-  nixjs-overlay = import nixjs { inherit purescript; };
-  pkgs = import nixpkgs { overlays = [ nixjs-overlay ]; };
+  niv-overlay = self: _: {
+    niv = self.symlinkJoin {
+      name = "niv";
+      paths = [ sources.niv ];
+      buildInputs = [ self.makeWrapper ];
+      postBuild = ''
+        wrapProgram $out/bin/niv \
+          --add-flags "--sources-file ${toString ./sources.json}"
+      '';
+    };
+  };
+  pkgs = import sources.nixpkgs { overlays = [ niv-overlay ]; };
 in
 
 pkgs.mkShell {
   buildInputs = [
+    pkgs.niv
     pkgs.git
     pkgs.nodejs
     pkgs.yarn
diff --git a/sources.json b/sources.json
new file mode 100644
index 0000000..59e82c1
--- /dev/null
+++ b/sources.json
@@ -0,0 +1,14 @@
+{
+    "nixpkgs": {
+        "branch": "nixos-19.09",
+        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
+        "homepage": "https://github.com/NixOS/nixpkgs",
+        "owner": "NixOS",
+        "repo": "nixpkgs-channels",
+        "rev": "b7bbc6d37878ed00b6467b574b02e840279f7d3d",
+        "sha256": "02q10jgi6m0vak3amb50ifw1pj82i17hs0npdkig7lsp8w3is7jq",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/b7bbc6d37878ed00b6467b574b02e840279f7d3d.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}
diff --git a/sources.nix b/sources.nix
new file mode 100644
index 0000000..ba3bafe
--- /dev/null
+++ b/sources.nix
@@ -0,0 +1,12 @@
+let
+  nivSrc = fetchTarball {
+    url = "https://github.com/nmattia/niv/tarball/4f038fc598d5494f5d16302270edc61ab2898c79";
+    sha256 = "1dwfkd942wisccpsv0kf47abl0n17d9v4zasv4bm8lvy1dhv82ia";
+  };
+  sources = import "${nivSrc}/nix/sources.nix" {
+    sourcesFile = ./sources.json;
+  };
+  niv = import nivSrc {};
+in
+
+niv // sources
diff --git a/src/HTTPure/Server.purs b/src/HTTPure/Server.purs
index 86b886e..58fea2e 100644
--- a/src/HTTPure/Server.purs
+++ b/src/HTTPure/Server.purs
@@ -81,7 +81,7 @@ serveSecure' sslOptions options router onStarted = do
 -- | Given a port number, return a `HTTP.ListenOptions` `Record`.
 listenOptions :: Int -> HTTP.ListenOptions
 listenOptions port =
-  { hostname: "localhost"
+  { hostname: "0.0.0.0"
   , port: port
   , backlog: Maybe.Nothing
   }