diff --git a/flake.lock b/flake.lock
index cacdb0f..ac39fd2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -56,6 +56,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1719082008,
+        "narHash": "sha256-jHJSUH619zBQ6WdC21fFAlDxHErKVDJ5fpN0Hgx4sjs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9693852a2070b398ee123a329e68f0dab5526681",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1718419000,
@@ -118,6 +134,7 @@
     "root": {
       "inputs": {
         "nixpkgs": "nixpkgs",
+        "nixpkgs-unstable": "nixpkgs-unstable",
         "paste-py": "paste-py"
       }
     },
diff --git a/flake.nix b/flake.nix
index 8972f5b..560306d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,30 +1,31 @@
 {
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+  inputs.nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
   inputs.paste-py.url = "git+https://github.com/Armael/paste-py?rev=fd4b051067a09b1f76df5516514330e0d53398f7";
   inputs.paste-py.inputs.nixpkgs.follows = "nixpkgs";
 
-  outputs = { self, nixpkgs, ... }@attrs: {
+  outputs = { self, nixpkgs, ... }@inputs: {
     nixosConfigurations."oven" = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
-      specialArgs = attrs;
+      specialArgs = inputs;
       modules = [ ./oven/configuration.nix ];
     };
 
     nixosConfigurations."pastila" = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
-      specialArgs = attrs;
+      specialArgs = inputs;
       modules = [ ./pastila/configuration.nix ];
     };
 
     nixosConfigurations."mesange" = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
-      specialArgs = attrs;
+      specialArgs = inputs;
       modules = [ ./mesange/configuration.nix ];
     };
 
     nixosConfigurations."pinson" = nixpkgs.lib.nixosSystem {
       system = "x86_64-linux";
-      specialArgs = attrs;
+      specialArgs = inputs;
       modules = [ ./pinson/configuration.nix ];
     };
   };
diff --git a/pastila/configuration.nix b/pastila/configuration.nix
index ce4994f..4fad267 100644
--- a/pastila/configuration.nix
+++ b/pastila/configuration.nix
@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, nixpkgs-unstable, ... }:
 
 let
   vars = import ../vars.nix;
@@ -21,6 +21,15 @@ in
       ./imap.nix
     ];
 
+  nixpkgs.overlays = [
+    (final: _prev: {
+       unstable = import nixpkgs-unstable {
+         system = final.system;
+	 config.allowUnfree = true;
+       };
+    })
+  ];
+
   # Use the GRUB 2 boot loader.
   boot.loader.grub.enable = true;
   boot.loader.grub.device = "/dev/vda";
@@ -67,7 +76,7 @@ in
     weechat
     transmission
     tremc
-    poezio
+    unstable.poezio
   ];
 
   # This option defines the first version of NixOS you have installed on this particular machine,