diff --git a/pkgs/default.nix b/pkgs/default.nix
index fc5db33..1a5ca18 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -1,4 +1,12 @@
-{pkgs, inputs ? null, ...}: {
+{pkgs, inputs ? null, ...}: let
+  # Upstream opencode v1.1.27 strictly requires Bun 1.3.5 but its locked nixpkgs provides 1.3.6
+  # We patch package.json to match the environment version to fix the build
+  opencode = inputs.opencode.packages.${pkgs.system}.opencode.overrideAttrs (old: {
+    postPatch = (old.postPatch or "") + ''
+      substituteInPlace package.json --replace-fail "bun@1.3.5" "bun@1.3.6"
+    '';
+  });
+in {
   # Custom packages registry
   # Each package is defined in its own directory under pkgs/
   beads = pkgs.callPackage ./beads {};
@@ -15,6 +23,6 @@
   zellij-ps = pkgs.callPackage ./zellij-ps {};
 
   # Imported from flake inputs
-  opencode = inputs.opencode.packages.${pkgs.system}.opencode;
-  opencode-desktop = inputs.opencode.packages.${pkgs.system}.desktop;
+  inherit opencode;
+  opencode-desktop = inputs.opencode.packages.${pkgs.system}.desktop.override { inherit opencode; };
 }