diff --git a/default.nix b/default.nix
index 3f83816f3..a1d99ffed 100644
--- a/default.nix
+++ b/default.nix
@@ -10,7 +10,10 @@
 }:
 
 let
-  inherit (beam_nox.packages.erlang) mixRelease buildMix elixir;
+  beamPackages = beam_nox.packages.erlang.extend (self: super: {
+    elixir = super.elixir_1_15;
+  });
+  inherit (beamPackages) mixRelease buildMix elixir;
 in
 mixRelease rec {
   pname = "mobilizon";