diff --git a/flake.nix b/flake.nix
index 5690e76..0aa17a9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -20,19 +20,9 @@
       let
         pkgs = nixpkgs.legacyPackages.${system};
 
-        # Erlang OTP 28 without wxwidgets (avoids gstreamer→hotdoc→clang chain)
-        erlang_28_headless = pkgs.beamPackages.erlang.override {
-          wxGTK32     = null;
-          libGL       = null;
-          libGLU      = null;
-          wrapGAppsHook3 = pkgs.buildEnv { name = "empty"; paths = []; };
-          xorg        = { libX11 = null; };
-        };
-
-        # Elixir 1.20.0-rc.4 — not yet in nixpkgs; override elixir_1_19 against headless OTP 28
-        elixir_1_20_rc4 = (pkgs.beamPackages.elixir_1_19.override {
-          erlang = erlang_28_headless;
-        }).overrideAttrs (_old: {
+        # Elixir 1.20.0-rc.4 — not yet in nixpkgs; override elixir_1_19 against cached OTP 28
+        # Uses standard erlang (already in binary cache) to avoid full recompile
+        elixir_1_20_rc4 = pkgs.beamPackages.elixir_1_19.overrideAttrs (_old: {
           version = "1.20.0-rc.4";
           src = pkgs.fetchFromGitHub {
             owner = "elixir-lang";
@@ -44,10 +34,10 @@
       in {
         devShells.default = pkgs.mkShell {
           buildInputs = with pkgs; [
-            elixir_1_20_rc4    # 1.20.0-rc.4 built from source against OTP 28
-            erlang_28_headless # OTP 28.5, no wx/gui (headless server use)
-            nodejs_22          # Phoenix asset pipeline
-            inotify-tools      # LiveReload on Linux
+            elixir_1_20_rc4 # 1.20.0-rc.4 built from source against OTP 28
+            pkgs.beamPackages.erlang # OTP 28.5 (from binary cache)
+            nodejs_22       # Phoenix asset pipeline
+            inotify-tools   # LiveReload on Linux
           ];
 
           shellHook = ''