diff --git a/hydra/mcu.json b/hydra/mcu.json
index 80dffff..50f6ad3 100644
--- a/hydra/mcu.json
+++ b/hydra/mcu.json
@@ -11,7 +11,7 @@
         "emailoverride": "",
         "keepnr": 10,
         "inputs": {
-            "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs nixos-21.05", "emailresponsible": false },
+            "nixpkgs": { "type": "git", "value": "git://github.com/NixOS/nixpkgs nixos-21.11", "emailresponsible": false },
             "mozillaOverlay": { "type": "git", "value": "git://github.com/mozilla/nixpkgs-mozilla.git", "emailresponsible": false },
             "nixScripts": { "type": "git", "value": "https://git.m-labs.hk/M-Labs/nix-scripts.git", "emailresponsible": false },
             "stabilizerSrc": { "type": "git", "value": "git://github.com/HarryMakes/stabilizer.git pre-mqtt 1", "emailresponsible": false },