diff --git a/nixos/default.nix b/nixos/default.nix
index a8fd4728..66b08280 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -52,6 +52,7 @@
     nixfmt       # Nix code formatter
     e2fsprogs    # disk format utilities, like mkfs.ext4
     bat          # Like cat, but with syntax highlighting
+    openssl      # Used to generate certs, random strings, etc
   ];
 
   # Select internationalisation properties.