diff --git a/pkgs/development/beam-modules/default.nix b/pkgs/development/beam-modules/default.nix
index 570155e4d1a8..02877a954117 100644
--- a/pkgs/development/beam-modules/default.nix
+++ b/pkgs/development/beam-modules/default.nix
@@ -33,6 +33,7 @@ let
         buildRebar3 = callPackage ./build-rebar3.nix {};
         buildHex = callPackage ./build-hex.nix {};
         buildErlangMk = callPackage ./build-erlang-mk.nix {};
+        fetchMixDeps = callPackage ./fetch-mix-deps.nix { };
         buildMix = callPackage ./build-mix.nix {};
 
         # BEAM-based languages.
diff --git a/pkgs/development/beam-modules/fetch-mix-deps.nix b/pkgs/development/beam-modules/fetch-mix-deps.nix
new file mode 100644
index 000000000000..020a82ad70b7
--- /dev/null
+++ b/pkgs/development/beam-modules/fetch-mix-deps.nix
@@ -0,0 +1,40 @@
+{ stdenvNoCC, lib, elixir, hex, rebar, rebar3, cacert, git }:
+
+{ name, version, sha256, src, mixEnv ? "prod", debug ? false, meta ? { } }:
+
+stdenvNoCC.mkDerivation ({
+  name = "mix-deps-${name}-${version}";
+
+  nativeBuildInputs = [ elixir hex cacert git ];
+
+  inherit src;
+
+  MIX_ENV = mixEnv;
+  MIX_DEBUG = if debug then 1 else 0;
+  DEBUG = if debug then 1 else 0; # for rebar3
+
+  configurePhase = ''
+    export HEX_HOME="$TEMPDIR/.hex";
+    export MIX_HOME="$TEMPDIR/.mix";
+    export MIX_DEPS_PATH="$out";
+
+    # Rebar
+    mix local.rebar rebar "${rebar}/bin/rebar"
+    mix local.rebar rebar3 "${rebar3}/bin/rebar3"
+    export REBAR_GLOBAL_CONFIG_DIR="$TMPDIR/rebar3"
+    export REBAR_CACHE_DIR="$TMPDIR/rebar3.cache"
+  '';
+
+  dontBuild = true;
+
+  installPhase = ''
+    mix deps.get --only ${mixEnv}
+  '';
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+  inherit meta;
+})