diff --git a/flake.lock b/flake.lock
index b97563d..5570089 100644
--- a/flake.lock
+++ b/flake.lock
@@ -17,16 +17,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1637155076,
-        "narHash": "sha256-26ZPNiuzlsnXpt55Q44+yzXvp385aNAfevzVEKbrU5Q=",
+        "lastModified": 1638021263,
+        "narHash": "sha256-9Ia8iOtj2+keR2rvS7cfK9ZkKi4YMW21NhTiRWcm/Qo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "715f63411952c86c8f57ab9e3e3cb866a015b5f2",
+        "rev": "f4bba5b4c7e8ba3334617c34435cd2332a359c35",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "ref": "nixos-unstable",
+        "ref": "nixos-21.11-small",
         "type": "indirect"
       }
     },
diff --git a/flake.nix b/flake.nix
index 7ad7235..8ed315f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,5 +1,5 @@
 {
-  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
+  inputs.nixpkgs.url = "nixpkgs/nixos-21.11-small";
   inputs.impermanence.url = "github:nix-community/impermanence";
 
   outputs = { self, nixpkgs, impermanence, ... }: