diff --git a/modules/darwin/default.nix b/modules/darwin/default.nix
index 104fe10..26434d0 100644
--- a/modules/darwin/default.nix
+++ b/modules/darwin/default.nix
@@ -1,7 +1,7 @@
 { config, pkgs, ... }:
 
 let
-  emacsOverlaySha256 = "0ph4w9c8si2flsgin17k0xnpkv48q82m7fvrqd8jqw5vlq100rii";
+  emacsOverlaySha256 = "1smprpp3zqh04jdv0b7ibc69n025j1bnpp76lnwyvidilf055g2h";
 in
 {
   home-manager.backupFileExtension = "nix-backup";
diff --git a/modules/darwin/packages.nix b/modules/darwin/packages.nix
index e3c2625..ef6a96d 100644
--- a/modules/darwin/packages.nix
+++ b/modules/darwin/packages.nix
@@ -110,6 +110,7 @@ with pkgs;
       flask-socketio
       h11
       idna
+      intelhex
       importlib-metadata
       itsdangerous
       jinja2
diff --git a/overlays/10-feather-font.nix b/overlays/10-feather-font.nix
deleted file mode 100644
index 02390cc..0000000
--- a/overlays/10-feather-font.nix
+++ /dev/null
@@ -1,30 +0,0 @@
-self: super: with super; {
-
-  feather-font = let
-    version = "1.0";
-    pname = "feather-font";
-  in stdenv.mkDerivation {
-    name = "${pname}-${version}";
-
-    src = fetchzip {
-      url = "https://github.com/dustinlyons/feather-font/archive/refs/tags/${version}.zip";
-      sha256 = "sha256-Zsz8/qn7XAG6BVp4XdqooEqioFRV7bLH0bQkHZvFbsg=";
-    };
-
-    buildInputs = [ unzip ];
-    phases = [ "unpackPhase" "installPhase" ];
-
-    installPhase = ''
-      mkdir -p $out/share/fonts/truetype
-      cp $src/feather.ttf $out/share/fonts/truetype/
-    '';
-
-    meta = with lib; {
-      homepage = "https://www.feathericons.com/";
-      description = "Set of font icons from the open source collection Feather Icons";
-      license = licenses.mit;
-      maintainers = [ maintainers.dlyons ];
-      platforms = [ platforms.x86_64-darwin ];
-    };
-  };
-}
diff --git a/overlays/20-zotero-pin.nix b/overlays/20-zotero-pin.nix
new file mode 100644
index 0000000..109afe5
--- /dev/null
+++ b/overlays/20-zotero-pin.nix
@@ -0,0 +1,15 @@
+final: prev:
+
+let
+  pinnedPkgs = import (builtins.fetchTarball {
+    # Last nixpkgs Zotero package revision before 10.0.2.
+    url = "https://github.com/NixOS/nixpkgs/archive/4118d63e017feb54b48e7341e4b6f0ac5348f074.tar.gz";
+    sha256 = "1w33226pjk7hs9hbzy0ghcvgps0yicm0r2zxnnrzsr26pzvjjm6z";
+  }) {
+    system = prev.stdenv.hostPlatform.system;
+    config = prev.config;
+  };
+in
+{
+  zotero = pinnedPkgs.zotero;
+}
\ No newline at end of file