diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a654725..5c10755b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## [0.22.3](https://github.com/elixir-tools/next-ls/compare/v0.22.2...v0.22.3) (2024-05-15)
+
+
+### Bug Fixes
+
+* ensure some elixir internals are ready ([#478](https://github.com/elixir-tools/next-ls/issues/478)) ([f4685d0](https://github.com/elixir-tools/next-ls/commit/f4685d01266b4afb7f557d9a361fc7770aa22ec6)), closes [#467](https://github.com/elixir-tools/next-ls/issues/467)
+
+## [0.22.2](https://github.com/elixir-tools/next-ls/compare/v0.22.1...v0.22.2) (2024-05-14)
+
+
+### Bug Fixes
+
+* **completions:** work in guards ([#475](https://github.com/elixir-tools/next-ls/issues/475)) ([e0573ab](https://github.com/elixir-tools/next-ls/commit/e0573ab23c439313ed2546015f12a21dfe573d1d))
+
 ## [0.22.1](https://github.com/elixir-tools/next-ls/compare/v0.22.0...v0.22.1) (2024-05-13)
 
 
diff --git a/flake.nix b/flake.nix
index 10830b1d..a5ae57ab 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,7 +14,7 @@
   }: let
     inherit (nixpkgs) lib;
 
-    version = "0.22.1"; # x-release-please-version
+    version = "0.22.3"; # x-release-please-version
 
     # Helper to provide system-specific attributes
     forAllSystems = f:
diff --git a/lib/next_ls/runtime.ex b/lib/next_ls/runtime.ex
index 4ca68420..749122d6 100644
--- a/lib/next_ls/runtime.ex
+++ b/lib/next_ls/runtime.ex
@@ -231,22 +231,32 @@ defmodule NextLS.Runtime do
              true <- connect(node, port, 120) do
           NextLS.Logger.info(logger, "Connected to node #{node}")
 
-          :next_ls
-          |> :code.priv_dir()
-          |> Path.join("monkey/_next_ls_private_compiler.ex")
-          |> then(&:rpc.call(node, Code, :compile_file, [&1]))
-          |> tap(fn
-            {:badrpc, error} ->
-              NextLS.Logger.error(logger, "Bad RPC call to node #{node}: #{inspect(error)}")
-              send(me, {:cancel, error})
-
-            _ ->
-              :ok
-          end)
-
-          {:ok, _} = :rpc.call(node, :_next_ls_private_compiler, :start, [])
-
-          send(me, {:node, node})
+          result =
+            :next_ls
+            |> :code.priv_dir()
+            |> Path.join("monkey/_next_ls_private_compiler.ex")
+            |> then(fn path ->
+              if await_config_table(node, 5) do
+                :rpc.call(node, Code, :compile_file, [path])
+              else
+                {:badrpc, "internal ets table not found"}
+              end
+            end)
+            |> then(fn
+              {:badrpc, error} ->
+                NextLS.Logger.error(logger, "Bad RPC call to node #{node}: #{inspect(error)}")
+                send(me, {:cancel, error})
+                :error
+
+              _ ->
+                :ok
+            end)
+
+          if result == :ok do
+            {:ok, _} = :rpc.call(node, :_next_ls_private_compiler, :start, [])
+
+            send(me, {:node, node})
+          end
         else
           error ->
             send(me, {:cancel, error})
@@ -275,6 +285,20 @@ defmodule NextLS.Runtime do
     end
   end
 
+  defp await_config_table(_node, 0) do
+    false
+  end
+
+  defp await_config_table(node, attempts) do
+    # this is an Elixir implementation detail, handle with care
+    if :undefined == :rpc.call(node, :ets, :whereis, [:elixir_config]) do
+      Process.sleep(100)
+      await_config_table(node, attempts - 1)
+    else
+      true
+    end
+  end
+
   @impl GenServer
   def handle_call(:ready?, _from, state) when is_ready(state) do
     {:reply, true, state}
diff --git a/mix.exs b/mix.exs
index 73f7a0ae..7dd22abb 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule NextLS.MixProject do
   use Mix.Project
 
-  @version "0.22.1" # x-release-please-version
+  @version "0.22.3" # x-release-please-version
 
   def project do
     [
diff --git a/priv/monkey/_next_ls_private_compiler.ex b/priv/monkey/_next_ls_private_compiler.ex
index 1ef1b1dc..d673b3ea 100644
--- a/priv/monkey/_next_ls_private_compiler.ex
+++ b/priv/monkey/_next_ls_private_compiler.ex
@@ -1032,14 +1032,13 @@ defmodule :_next_ls_private_compiler do
   @moduledoc false
 
   def start do
+    Code.put_compiler_option(:parser_options, columns: true, token_metadata: true)
+
     children = [
       :_next_ls_private_compiler_worker
     ]
 
-    # See https://hexdocs.pm/elixir/Supervisor.html
-    # for other strategies and supported options
-    opts = [strategy: :one_for_one, name: :_next_ls_private_application_supervisor]
-    {:ok, pid} = Supervisor.start_link(children, opts)
+    {:ok, pid} = Supervisor.start_link(children, strategy: :one_for_one, name: :_next_ls_private_application_supervisor)
     Process.unlink(pid)
     {:ok, pid}
   end
@@ -1049,7 +1048,6 @@ defmodule :_next_ls_private_compiler do
   def compile do
     # keep stdout on this node
     Process.group_leader(self(), Process.whereis(:user))
-    Code.put_compiler_option(:parser_options, columns: true, token_metadata: true)
 
     Code.put_compiler_option(:tracers, [NextLSPrivate.DepTracer | @tracers])
 
@@ -1425,39 +1423,36 @@ if Version.match?(System.version(), ">= 1.17.0-dev") do
       end
     end
 
-    defp expand_macro(_meta, Kernel, type, [{name, _, params}, [{_, block}]], _callback, state, env)
-         when type in [:def, :defp] and is_tuple(block) and is_atom(name) and is_list(params) do
-      {_, state, penv} =
-        for p <- params, reduce: {nil, state, env} do
-          {_, state, penv} ->
-            expand_pattern(p, state, penv)
-        end
-
-      {res, state, _env} = expand(block, state, penv)
+    defp expand_macro(_meta, Kernel, type, args, _callback, state, env)
+         when type in [:def, :defmacro, :defp, :defmacrop] do
+      # extract the name, params, guards, and blocks
+      {name, params, guards, blocks} =
+        case args do
+          [{:when, _, [{name, _, params} | guards]} | maybe_blocks] ->
+            {name, params, guards, maybe_blocks}
 
-      arity = length(List.wrap(params))
-      functions = Map.update(state.functions, env.module, [{name, arity}], &Keyword.put_new(&1, name, arity))
-      {res, put_in(state.functions, functions), env}
-    end
+          [{name, _, params} | maybe_blocks] ->
+            {name, params, [], maybe_blocks}
+        end
 
-    defp expand_macro(_meta, Kernel, type, [{name, _, params}, block], _callback, state, env)
-         when type in [:defmacro, :defmacrop] do
-      {_res, state, penv} = expand(params, state, env)
-      {res, state, _env} = expand(block, state, penv)
+      blocks = List.first(blocks, [])
 
-      arity = length(List.wrap(params))
-      macros = Map.update(state.macros, env.module, [{name, arity}], &Keyword.put_new(&1, name, arity))
-      {res, put_in(state.macros, macros), env}
-    end
-
-    defp expand_macro(_meta, Kernel, type, [{name, _, params}, blocks], _callback, state, env)
-         when type in [:def, :defp] and is_atom(name) and is_list(params) and is_list(blocks) do
+      # collect the environment from the parameters
+      # parameters are always patterns
       {_, state, penv} =
         for p <- params, reduce: {nil, state, env} do
           {_, state, penv} ->
             expand_pattern(p, state, penv)
         end
 
+      # expand guards, which includes the env from params
+      {_, state, _} =
+        for guard <- guards, reduce: {nil, state, penv} do
+          {_, state, env} ->
+            expand(guard, state, env)
+        end
+
+      # expand the blocks, there could be `:do`, `:after`, `:catch`, etc
       {blocks, state} =
         for {type, block} <- blocks, reduce: {[], state} do
           {acc, state} ->
@@ -1467,26 +1462,21 @@ if Version.match?(System.version(), ">= 1.17.0-dev") do
 
       arity = length(List.wrap(params))
 
-      functions = Map.update(state.functions, env.module, [{name, arity}], &Keyword.put_new(&1, name, arity))
-      {Enum.reverse(blocks), put_in(state.functions, functions), env}
-    end
-
-    defp expand_macro(_meta, Kernel, type, [{_name, _, params}, blocks], _callback, state, env)
-         when type in [:def, :defp] and is_list(params) and is_list(blocks) do
-      {_, state, penv} =
-        for p <- params, reduce: {nil, state, env} do
-          {_, state, penv} ->
-            expand_pattern(p, state, penv)
+      # determine which key to save this function in state
+      state_key =
+        case type do
+          type when type in [:def, :defp] -> :functions
+          type when type in [:defmacro, :defmacrop] -> :macros
         end
 
-      {blocks, state} =
-        for {type, block} <- blocks, reduce: {[], state} do
-          {acc, state} ->
-            {res, state, _env} = expand(block, state, penv)
-            {[{type, res} | acc], state}
+      funcs =
+        if is_atom(name) do
+          Map.update(state[state_key], env.module, [{name, arity}], &Keyword.put_new(&1, name, arity))
+        else
+          state[state_key]
         end
 
-      {Enum.reverse(blocks), state, env}
+      {Enum.reverse(blocks), put_in(state[state_key], funcs), env}
     end
 
     defp expand_macro(meta, Kernel, :@, [{name, _, p}] = args, callback, state, env) when is_list(p) do
diff --git a/test/next_ls/completions_test.exs b/test/next_ls/completions_test.exs
index e5422cc8..543fa377 100644
--- a/test/next_ls/completions_test.exs
+++ b/test/next_ls/completions_test.exs
@@ -809,4 +809,33 @@ defmodule NextLS.CompletionsTest do
     assert_match %{"kind" => 6, "label" => "items"} in results
     assert_match %{"kind" => 6, "label" => "item"} not in results
   end
+
+  test "parameters are available inside guards", %{client: client, foo: foo} do
+    uri = uri(foo)
+
+    did_open(client, foo, """
+    defmodule Foo do
+      def run(items) when is_list(i
+    end
+    """)
+
+    request client, %{
+      method: "textDocument/completion",
+      id: 2,
+      jsonrpc: "2.0",
+      params: %{
+        textDocument: %{
+          uri: uri
+        },
+        position: %{
+          line: 1,
+          character: 31
+        }
+      }
+    }
+
+    assert_result 2, results
+
+    assert_match %{"kind" => 6, "label" => "items"} in results
+  end
 end