diff --git a/flake.lock b/flake.lock
index 7b7d657b8..a848ba776 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,7 +2,9 @@
   "nodes": {
     "dogetipbot-telegram": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": [
+          "nixpkgs"
+        ]
       },
       "locked": {
         "lastModified": 1635873573,
@@ -21,11 +23,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1635719588,
-        "narHash": "sha256-pWjdy0NheM97NsPE6+jUnr5LYyeA0sBGTdw4mfXMGZQ=",
+        "lastModified": 1635806954,
+        "narHash": "sha256-yX/zjbIL/HdXh8a92hWJ+31gsLLv7byA1XRuPARaLro=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f0869b1a2c0b150aac26e10bb5c2364ffb2e804f",
+        "rev": "372e59d2af704bffd133cbe029f1d5efe73ba6fb",
         "type": "github"
       },
       "original": {
@@ -49,47 +51,19 @@
         "type": "indirect"
       }
     },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1635806954,
-        "narHash": "sha256-yX/zjbIL/HdXh8a92hWJ+31gsLLv7byA1XRuPARaLro=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "372e59d2af704bffd133cbe029f1d5efe73ba6fb",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-21.05",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs_3": {
-      "locked": {
-        "lastModified": 1607522989,
-        "narHash": "sha256-o/jWhOSAlaK7y2M57OIriRt6whuVVocS/T0mG7fd1TI=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "e9158eca70ae59e73fae23be5d13d3fa0cfc78b4",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-unstable",
-        "type": "indirect"
-      }
-    },
     "root": {
       "inputs": {
         "dogetipbot-telegram": "dogetipbot-telegram",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": "nixpkgs",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "simple-nixos-mailserver": "simple-nixos-mailserver"
       }
     },
     "simple-nixos-mailserver": {
       "inputs": {
-        "nixpkgs": "nixpkgs_3",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
         "utils": "utils"
       },
       "locked": {
diff --git a/flake.nix b/flake.nix
index 740953add..cbcb814da 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,8 +2,14 @@
   inputs = {
     nixpkgs.url = "flake:nixpkgs/nixos-21.05";
     nixpkgs-unstable.url = "flake:nixpkgs/nixos-unstable";
-    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-21.05";
-    dogetipbot-telegram.url = "gitlab:nyanloutre/dogetipbot-telegram/master";
+    simple-nixos-mailserver = {
+      url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-21.05";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    dogetipbot-telegram = {
+      url = "gitlab:nyanloutre/dogetipbot-telegram/master";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = { self, nixpkgs, nixpkgs-unstable, simple-nixos-mailserver, dogetipbot-telegram }: {