diff --git a/flake.lock b/flake.lock
index 5f1c4fb..9b39a16 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,15 +2,15 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1617746212,
-        "narHash": "sha256-rRllhEFv1qT7dOOpAtgT+EFwYGuZa344MScz/oBLOPs=",
-        "owner": "nixos",
+        "lastModified": 1618251784,
+        "narHash": "sha256-/IG7op2hUVnjzKt2UXL152+YsL0gdPakk6/RxondIJ0=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "adfccd848d2393a398134049cce53ee175fa0283",
+        "rev": "311ceed827f531f88f46222920cd1ebb2c101f73",
         "type": "github"
       },
       "original": {
-        "owner": "nixos",
+        "owner": "NixOS",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -24,11 +24,11 @@
     "zentralwerk-network-key": {
       "locked": {
         "dir": "nix/key",
-        "lastModified": 1617746481,
-        "narHash": "sha256-BvaPoHgLiS+V+QBnZF7dONjqT7SulDVFBH+8oD3fm4k=",
+        "lastModified": 1618099335,
+        "narHash": "sha256-EteGJyT4VkaLUKxnXhiesfqp4rqyQ+fEsFgTr/9Nygw=",
         "ref": "nix",
-        "rev": "ff126aa01b79744d473c5563a7a66e8799085909",
-        "revCount": 939,
+        "rev": "4b8b1a9382baacc60bb30d69994c1321494a1143",
+        "revCount": 968,
         "type": "git",
         "url": "https://gitea.c3d2.de/zentralwerk/network.git?dir=nix%2fkey"
       },
diff --git a/flake.nix b/flake.nix
index 3f983fb..6904c15 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,8 @@
   description = "Zentralwerk network";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs";
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    # TODO: nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05";
     # `nix flake update --override-flake zentralwerk-network-key git+file:///...`
     # to provide the GPG secret key
     zentralwerk-network-key.url = "git+https://gitea.c3d2.de/zentralwerk/network.git?dir=nix/key&ref=nix";