diff --git a/nix/default.nix b/nix/default.nix
deleted file mode 100644
index a1941c4e..00000000
--- a/nix/default.nix
+++ /dev/null
@@ -1,45 +0,0 @@
-{ system ? builtins.currentSystem
-, nixpkgs ? import ./nixpkgs.nix { inherit system; }
-}:
-let
-  mkEnv = nixpkgs.callPackage ./mkEnv.nix { };
-in
-rec {
-  inherit
-    nixpkgs
-    ;
-
-  protoc-gen-grpc-java = nixpkgs.callPackage ./pkgs/protoc-gen-grpc-java { };
-
-  env = mkEnv {
-    env = {
-      # Configure nix to use nixpgks
-      NIX_PATH = "nixpkgs=${toString nixpkgs.path}";
-      # Set the env for gradle
-      JAVA_HOME = "@env-root@/lib/openjdk";
-    };
-
-    paths = [
-      # Development tools
-      nixpkgs.gitAndTools.git-absorb
-      nixpkgs.jq
-      nixpkgs.niv
-      nixpkgs.websocat
-      nixpkgs.yq
-
-      # Protobuf stuff
-      nixpkgs.protobuf3_9
-      protoc-gen-grpc-java
-
-      # Code formatting
-      nixpkgs.treefmt
-      nixpkgs.nixpkgs-fmt
-      nixpkgs.shfmt
-
-      nixpkgs.jdk
-      nixpkgs.coreutils
-      nixpkgs.gnugrep
-      nixpkgs.which
-    ];
-  };
-}
diff --git a/nix/lib/force_cached.nix b/nix/lib/force_cached.nix
deleted file mode 100644
index 0e416d51..00000000
--- a/nix/lib/force_cached.nix
+++ /dev/null
@@ -1,38 +0,0 @@
-# Source https://github.com/Mic92/nix-build-uncached/blob/master/scripts/force_cached.nix
-coreutils: attrs:
-with builtins;
-let
-  # Copied from <nixpkgs/lib>
-  isDerivation = x: isAttrs x && x ? type && x.type == "derivation";
-
-  # Return true if `nix-build` would traverse that attribute set to look for
-  # more derivations to build.
-  hasRecurseIntoAttrs = x: isAttrs x && (x.recurseForDerivations or false);
-
-  # Wraps derivations that disallow substitutes so that they can be cached.
-  toCachedDrv = drv:
-    if !(drv.allowSubstitutes or true) then
-      derivation
-        {
-          name = "${drv.name}-to-cached";
-          system = drv.system;
-          builder = "/bin/sh";
-          args = [ "-c" "${coreutils}/bin/ln -s ${drv} $out; exit 0" ];
-        }
-    else
-      drv;
-
-  op = _: val:
-    if isDerivation val then
-      toCachedDrv val
-    else if hasRecurseIntoAttrs val then
-      forceCached val
-    else
-      val
-  ;
-
-  # Traverses a tree of derivation and wrap all of those that disallow
-  # substitutes.
-  forceCached = attrs: mapAttrs op attrs;
-in
-forceCached attrs
diff --git a/nix/mkEnv.nix b/nix/mkEnv.nix
deleted file mode 100644
index 12364a51..00000000
--- a/nix/mkEnv.nix
+++ /dev/null
@@ -1,29 +0,0 @@
-{ lib, writeText, buildEnv }:
-
-{ name ? "dev-env"
-, # Environment variables to set
-  env ? { }
-, # Packages to add to the path
-  paths ? [ ]
-}:
-let
-  envToBash = name: value:
-    "export ${name}=${lib.escapeShellArg (toString value)}"
-  ;
-
-  exports = lib.concatStringsSep "\n"
-    (map (name: envToBash name env.${name}) (lib.attrNames env));
-
-  env-root = writeText "env-root" ''
-    export PATH=@env-root@/bin:$PATH
-
-    ${exports}
-  '';
-in
-buildEnv {
-  inherit name;
-  paths = paths;
-  postBuild = ''
-    sed "s|@env-root@|$out|g" ${env-root} > $out/.profile
-  '';
-}
diff --git a/nix/nixpkgs.nix b/nix/nixpkgs.nix
deleted file mode 100644
index 6c0edfe8..00000000
--- a/nix/nixpkgs.nix
+++ /dev/null
@@ -1,9 +0,0 @@
-{ system ? builtins.currentSystem }:
-let
-  sources = import ./sources.nix;
-in
-import sources.nixpkgs {
-  inherit system;
-  config = { };
-  overlays = [ ];
-}
diff --git a/nix/pkgs/protoc-gen-grpc-java/default.nix b/nix/pkgs/protoc-gen-grpc-java/default.nix
deleted file mode 100644
index e0651159..00000000
--- a/nix/pkgs/protoc-gen-grpc-java/default.nix
+++ /dev/null
@@ -1,23 +0,0 @@
-{ stdenv, runCommand, fetchurl, autoPatchelfHook, lib }:
-
-stdenv.mkDerivation rec {
-  pname = "protoc-gen-grpc-java";
-  version = "1.38.0";
-
-  src = fetchurl {
-    url = "https://repo1.maven.org/maven2/io/grpc/protoc-gen-grpc-java/${version}/protoc-gen-grpc-java-${version}-linux-x86_64.exe";
-    sha256 = "sha256:1gy5lkxj6d4vrgalwnjp15biybcnrmp695si9878y7high39ymr3";
-  };
-
-  nativeBuildInputs = [ autoPatchelfHook ];
-
-  unpackPhase = ''
-    cp $src ./bin
-    chmod +x ./bin
-  '';
-
-  installPhase = ''
-    mkdir -p $out/bin
-    mv ./bin $out/bin/$pname
-  '';
-}
diff --git a/nix/release.nix b/nix/release.nix
deleted file mode 100644
index 863f0c9c..00000000
--- a/nix/release.nix
+++ /dev/null
@@ -1,16 +0,0 @@
-# Use this file with nix-build-uncached on CI
-{ system ? builtins.currentSystem }:
-let
-  nixpkgs = import ./nixpkgs.nix { inherit system; };
-
-  # This is used to wrap all of our outputs, so they all end-up in the cache.
-  #
-  # There are two attributes ` allowSubstitutes = false;` and
-  # `preferLocalBuild = true;` that influence how derivations gets pulled and
-  # pushed.
-  forceCached = import ./lib/force_cached.nix nixpkgs.coreutils;
-
-  # All the packages that we care about
-  ourPackages = import ./. { inherit nixpkgs system; };
-in
-forceCached ourPackages
diff --git a/nix/sources.json b/nix/sources.json
deleted file mode 100644
index c1ec96f7..00000000
--- a/nix/sources.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-    "nixpkgs": {
-        "branch": "nixos-unstable",
-        "description": "Nix Packages collection",
-        "homepage": "",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "e4ef597edfd8a0ba5f12362932fc9b1dd01a0aef",
-        "sha256": "1w6y7ma2crcsfph60z8j1k3af0v2m110cbjrb62z287mn4skhqjs",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/e4ef597edfd8a0ba5f12362932fc9b1dd01a0aef.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    }
-}
diff --git a/nix/sources.nix b/nix/sources.nix
deleted file mode 100644
index 1fc17a6c..00000000
--- a/nix/sources.nix
+++ /dev/null
@@ -1,160 +0,0 @@
-# This file has been generated by Niv.
-let
-  #
-  # The fetchers. fetch_<type> fetches specs of type <type>.
-  #
-
-  fetch_file = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
-    if spec.builtin or true then
-      builtins_fetchurl { inherit (spec) url sha256; name = name'; }
-    else
-      pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
-
-  fetch_tarball = pkgs: name: spec:
-    let
-      name' = sanitizeName name + "-src";
-    in
-    if spec.builtin or true then
-      builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
-    else
-      pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
-
-  fetch_git = name: spec:
-    let
-      ref =
-        if spec ? ref then spec.ref else
-        if spec ? branch then "refs/heads/${spec.branch}" else
-        if spec ? tag then "refs/tags/${spec.tag}" else
-        abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
-    in
-    builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
-
-  fetch_local = spec: spec.path;
-
-  fetch_builtin-tarball = name: throw
-    ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
-        $ niv modify ${name} -a type=tarball -a builtin=true'';
-
-  fetch_builtin-url = name: throw
-    ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
-        $ niv modify ${name} -a type=file -a builtin=true'';
-
-  #
-  # Various helpers
-  #
-
-  # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
-  sanitizeName = name:
-    (
-      concatMapStrings (s: if builtins.isList s then "-" else s)
-        (
-          builtins.split "[^[:alnum:]+._?=-]+"
-            ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
-        )
-    );
-
-  # The actual fetching function.
-  fetch = pkgs: name: spec:
-
-    if ! builtins.hasAttr "type" spec then
-      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
-    else if spec.type == "file" then fetch_file pkgs name spec
-    else if spec.type == "tarball" then fetch_tarball pkgs name spec
-    else if spec.type == "git" then fetch_git name spec
-    else if spec.type == "local" then fetch_local spec
-    else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
-    else if spec.type == "builtin-url" then fetch_builtin-url name
-    else
-      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
-
-  # If the environment variable NIV_OVERRIDE_${name} is set, then use
-  # the path directly as opposed to the fetched source.
-  replace = name: drv:
-    let
-      saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
-      ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
-    in
-    if ersatz == "" then drv else
-      # this turns the string into an actual Nix path (for both absolute and
-      # relative paths)
-    if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
-
-  # Ports of functions for older nix versions
-
-  # a Nix version of mapAttrs if the built-in doesn't exist
-  mapAttrs = builtins.mapAttrs or (
-    f: set: with builtins;
-    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
-  );
-
-  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
-  range = first: last: if first > last then [ ] else builtins.genList (n: first + n) (last - first + 1);
-
-  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
-  stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
-
-  # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
-  stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
-  concatMapStrings = f: list: concatStrings (map f list);
-  concatStrings = builtins.concatStringsSep "";
-
-  # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
-  optionalAttrs = cond: as: if cond then as else { };
-
-  # fetchTarball version that is compatible between all the versions of Nix
-  builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchTarball;
-    in
-    if lessThan nixVersion "1.12" then
-      fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
-    else
-      fetchTarball attrs;
-
-  # fetchurl version that is compatible between all the versions of Nix
-  builtins_fetchurl = { url, name ? null, sha256 }@attrs:
-    let
-      inherit (builtins) lessThan nixVersion fetchurl;
-    in
-    if lessThan nixVersion "1.12" then
-      fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
-    else
-      fetchurl attrs;
-
-  # Create the final "sources" from the config
-  mkSources = config:
-    mapAttrs
-      (
-        name: spec:
-          if builtins.hasAttr "outPath" spec
-          then
-            abort
-              "The values in sources.json should not have an 'outPath' attribute"
-          else
-            spec // { outPath = replace name (fetch config.pkgs name spec); }
-      )
-      config.sources;
-
-  # The "config" used by the fetchers
-  mkConfig =
-    { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
-    , sources ? if isNull sourcesFile then { } else builtins.fromJSON (builtins.readFile sourcesFile)
-    , system ? builtins.currentSystem
-    , pkgs ? abort ''
-        Some source is being used outside of nixpkgs. For example using import.
-
-        Edit the sources.json and add `"builtin": true` to that source.
-      ''
-    }: rec {
-      # The sources, i.e. the attribute set of spec name to spec
-      inherit sources;
-
-      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
-      inherit pkgs;
-    };
-
-in
-mkSources (mkConfig { }) // { __functor = _: settings: mkSources (mkConfig settings); }