diff --git a/flake.lock b/flake.lock
index 08f91e4..77560c0 100644
--- a/flake.lock
+++ b/flake.lock
@@ -285,6 +285,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-head": {
+      "locked": {
+        "lastModified": 1708085481,
+        "narHash": "sha256-6pi0YjrW5yZIvjhrIkME4IgFBljsCZArkCSJeEd+W0o=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "8ecf09944fe1cf1ce5b08d34dbcd134e5764f0f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-lib": {
       "locked": {
         "dir": "lib",
@@ -315,6 +331,7 @@
         "nixos-flake": "nixos-flake",
         "nixpkgs": "nixpkgs",
         "nixpkgs-2205": "nixpkgs-2205",
+        "nixpkgs-head": "nixpkgs-head",
         "triton-vmtools": "triton-vmtools",
         "unstable": "unstable"
       }
diff --git a/flake.nix b/flake.nix
index e0c3b49..967f536 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,6 +6,8 @@
 
     nixpkgs-2205.url = "github:nixos/nixpkgs/nixos-22.05";
 
+    nixpkgs-head.url = "github:nixos/nixpkgs/master";
+
     nix-darwin.url = "github:lnl7/nix-darwin/master";
     nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
 
diff --git a/overlays/default.nix b/overlays/default.nix
index 6b81e38..e5740b1 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -14,6 +14,21 @@
             in
             {
               element-themes = prev.callPackage ./pkgs/element-themes { inherit (inputs) element-themes; };
+              mastodon = prev.mastodon.override {
+                 version = "4.2.7";
+                 patches = [
+                   (final.fetchpatch {
+                     url = "https://github.com/mastodon/mastodon/compare/v4.2.6...v4.2.7.patch";
+                     hash = "sha256-8FhlSIHOKIEjq62+rp8QdHY87qMCtDZwjyR0HabdHig=";
+                   })
+                 ];
+
+                 # Mastodon has been upgraded on master, the backport is still
+                 # in progress. This is a temporary hack until the backport
+                 # makes it to 23.11.
+                 # https://github.com/NixOS/nixpkgs/pull/289261
+                 gemset = import "${inputs.nixpkgs-head.sourceInfo.outPath}/pkgs/servers/mastodon/gemset.nix";
+               };
             })
         ];
       });