diff --git a/flake.nix b/flake.nix
index 87c388a..e7b7470 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,6 +3,7 @@
 
   # input URLs
   inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
+  inputs.nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
   inputs.nixpkgs-clicksforms.url = "github:nixos/nixpkgs/nixos-22.05";
   inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.deploy-rs.url = "github:serokell/deploy-rs";
@@ -32,7 +33,7 @@
 
   inputs.frappix.inputs.nixpkgs.follows = "nixpkgs";
 
-  outputs = { self, nixpkgs, deploy-rs, home-manager, sops-nix, scalpel
+  outputs = { self, nixpkgs, nixpkgs-unstable, deploy-rs, home-manager, sops-nix, scalpel
     , nixpkgs-privatebin, frappix, ... }@inputs:
     let
       system = "x86_64-linux";
@@ -45,6 +46,11 @@
 
         overlays = [
           (final: prev: {
+            inherit (nixpkgs-unstable.legacyPackages.${system})
+              vaultwarden vaultwarden-postgresql # vaultwarden updates often fix compatibility with the extension
+              matrix-sliding-sync; # matrix-sliding-sync updates very fast and being on an old version breaks app compatibility
+          }) # pin-unstable
+          (final: prev: {
             inherit (nixpkgs-privatebin.legacyPackages.${system})
               privatebin pbcli;
           })