diff --git a/modules/nix/default.nix b/modules/nix/default.nix
index 4ba47260..516c9398 100644
--- a/modules/nix/default.nix
+++ b/modules/nix/default.nix
@@ -30,7 +30,7 @@
 
   nix = {
     # Use default version alias for nix package
-    package = pkgs.nixVersions.nix_2_20;
+    package = pkgs.nixVersions.nix_2_21;
     gc.automatic = true;
     optimise.automatic = true;