diff --git a/lib/nixos/configuration.nix b/lib/nixos/configuration.nix
index cf2efe9..9ef195e 100644
--- a/lib/nixos/configuration.nix
+++ b/lib/nixos/configuration.nix
@@ -139,6 +139,7 @@ in
     [
       ddev
       just
+      mermaid-cli
       mkcert
       ttyper
       yt-dlp