diff --git a/modules/apps/dev.nix b/modules/apps/dev.nix
index 82461d0..ab7e31a 100644
--- a/modules/apps/dev.nix
+++ b/modules/apps/dev.nix
@@ -25,6 +25,7 @@ in {
       jetbrains.rider
       jetbrains.rust-rover
       jetbrains.webstorm
+      mermaid-cli
       mono
       nodejs_22
       platformio-core