diff --git a/hosts/containers/hydra/default.nix b/hosts/containers/hydra/default.nix
index a3c2f76b..21bff428 100644
--- a/hosts/containers/hydra/default.nix
+++ b/hosts/containers/hydra/default.nix
@@ -72,5 +72,5 @@
   # compatible, in order to avoid breaking some software such as database
   # servers. You should change this only after NixOS release notes say you
   # should.
-  system.stateVersion = "20.09"; # Did you read the comment?
+  system.stateVersion = "21.11"; # Did you read the comment?
 }