diff --git a/lib/next_ls.ex b/lib/next_ls.ex
index 5ac719e7..e268abc9 100644
--- a/lib/next_ls.ex
+++ b/lib/next_ls.ex
@@ -77,7 +77,8 @@ defmodule NextLS do
         :extensions,
         :registry,
         :bundle_base,
-        :mix_home
+        :mix_home,
+        :mix_archives
       ])
 
     GenLSP.start_link(__MODULE__, args, opts)
@@ -90,6 +91,7 @@ defmodule NextLS do
     dynamic_supervisor = Keyword.fetch!(args, :dynamic_supervisor)
     bundle_base = Keyword.get(args, :bundle_base, Path.expand("~/.cache/elixir-tools/nextls"))
     mix_home = Keyword.get(args, :mix_home)
+    mix_archives = Keyword.get(args, :mix_archives)
 
     registry = Keyword.fetch!(args, :registry)
 
@@ -104,6 +106,7 @@ defmodule NextLS do
        auto_update: Keyword.get(args, :auto_update, false),
        bundle_base: bundle_base,
        mix_home: mix_home,
+       mix_archives: mix_archives,
        exit_code: 1,
        documents: %{},
        refresh_refs: %{},
@@ -145,6 +148,11 @@ defmodule NextLS do
         BundledElixir.mix_home(lsp.assigns.bundle_base)
       end
 
+    mix_archives =
+      if init_opts.experimental.completions.enable do
+        BundledElixir.mix_archives(lsp.assigns.bundle_base)
+      end
+
     {:reply,
      %InitializeResult{
        capabilities: %ServerCapabilities{
@@ -187,6 +195,7 @@ defmodule NextLS do
      },
      assign(lsp,
        mix_home: mix_home,
+       mix_archives: mix_archives,
        root_uri: root_uri,
        workspace_folders: workspace_folders,
        client_capabilities: caps,
@@ -938,6 +947,7 @@ defmodule NextLS do
              mix_env: lsp.assigns.init_opts.mix_env,
              mix_target: lsp.assigns.init_opts.mix_target,
              mix_home: lsp.assigns.mix_home,
+             mix_archives: lsp.assigns.mix_archives,
              elixir_bin_path: elixir_bin_path,
              on_initialized: fn status ->
                if status == :ready do
@@ -1061,6 +1071,7 @@ defmodule NextLS do
               mix_env: lsp.assigns.init_opts.mix_env,
               mix_target: lsp.assigns.init_opts.mix_target,
               mix_home: lsp.assigns.mix_home,
+              mix_archives: lsp.assigns.mix_archives,
               on_initialized: fn status ->
                 if status == :ready do
                   Progress.stop(lsp, token, "NextLS runtime for folder #{name} has initialized!")
diff --git a/lib/next_ls/runtime.ex b/lib/next_ls/runtime.ex
index 10366a69..42289c29 100644
--- a/lib/next_ls/runtime.ex
+++ b/lib/next_ls/runtime.ex
@@ -112,6 +112,7 @@ defmodule NextLS.Runtime do
     mix_target = Keyword.fetch!(opts, :mix_target)
     elixir_bin_path = Keyword.get(opts, :elixir_bin_path)
     mix_home = Keyword.get(opts, :mix_home)
+    mix_archives = Keyword.get(opts, :mix_archives)
 
     elixir_exe = Path.join(elixir_bin_path, "elixir")
 
@@ -159,6 +160,11 @@ defmodule NextLS.Runtime do
               [{~c"MIX_HOME", ~c"#{mix_home}"}]
             else
               []
+            end ++
+            if mix_archives do
+              [{~c"MIX_ARCHIVES", ~c"#{mix_archives}"}]
+            else
+              []
             end
 
         args =
diff --git a/test/next_ls/autocomplete_test.exs b/test/next_ls/autocomplete_test.exs
index 0ca95dbf..41bda49f 100644
--- a/test/next_ls/autocomplete_test.exs
+++ b/test/next_ls/autocomplete_test.exs
@@ -74,6 +74,7 @@ defmodule NextLS.AutocompleteTest do
          mix_env: "dev",
          mix_target: "host",
          mix_home: Path.join(cwd, ".mix"),
+         mix_archives: Path.join(cwd, [".mix", "archives"]),
          registry: __MODULE__.Registry}
       )
 
diff --git a/test/next_ls/runtime_test.exs b/test/next_ls/runtime_test.exs
index 3de28f2c..c72e32e3 100644
--- a/test/next_ls/runtime_test.exs
+++ b/test/next_ls/runtime_test.exs
@@ -66,6 +66,7 @@ defmodule NextLs.RuntimeTest do
            mix_env: "dev",
            mix_target: "host",
            mix_home: Path.join(cwd, ".mix"),
+           mix_archives: Path.join(cwd, [".mix", "archives"]),
            registry: RuntimeTest.Registry}
         )
 
@@ -97,6 +98,7 @@ defmodule NextLs.RuntimeTest do
            mix_env: "dev",
            mix_target: "host",
            mix_home: Path.join(cwd, ".mix"),
+           mix_archives: Path.join(cwd, [".mix", "archives"]),
            registry: RuntimeTest.Registry}
         )
 
@@ -129,6 +131,7 @@ defmodule NextLs.RuntimeTest do
            mix_env: "dev",
            mix_target: "host",
            mix_home: Path.join(cwd, ".mix"),
+           mix_archives: Path.join(cwd, [".mix", "archives"]),
            registry: RuntimeTest.Registry}
         )
 
@@ -194,6 +197,7 @@ defmodule NextLs.RuntimeTest do
            mix_env: "dev",
            mix_target: "host",
            mix_home: Path.join(cwd, ".mix"),
+           mix_archives: Path.join(cwd, [".mix", "archives"]),
            registry: RuntimeTest.Registry}
         )
 
diff --git a/test/support/utils.ex b/test/support/utils.ex
index 882026ef..da1a4192 100644
--- a/test/support/utils.ex
+++ b/test/support/utils.ex
@@ -46,6 +46,7 @@ defmodule NextLS.Support.Utils do
 
     bundle_base = Path.join(tmp_dir, ".bundled")
     mixhome = Path.join(tmp_dir, ".mix")
+    mixarchives = Path.join(mixhome, "archives")
     File.mkdir_p!(bundle_base)
 
     tvisor = start_supervised!(Supervisor.child_spec(Task.Supervisor, id: :one))
@@ -73,7 +74,8 @@ defmodule NextLS.Support.Utils do
         extensions: extensions,
         cache: cache,
         bundle_base: bundle_base,
-        mix_home: mixhome
+        mix_home: mixhome,
+        mix_archives: mixarchives
       )
 
     Process.link(server.lsp)