diff --git a/nixos/code.nix b/nixos/code.nix
index 191ee08b..f40f190e 100644
--- a/nixos/code.nix
+++ b/nixos/code.nix
@@ -11,6 +11,7 @@ makeEnable config "myModules.code" true {
     claude-code
     codex
     gemini-cli
+    happy-coder
     opencode
 
     # MCP
diff --git a/nixos/flake.nix b/nixos/flake.nix
index f7179533..3c5f93c3 100644
--- a/nixos/flake.nix
+++ b/nixos/flake.nix
@@ -175,6 +175,10 @@
         pr = 434160; # git-sync-rs package
         hash = "sha256-0j0IcyHd7rE+MXc0SHu8UixW7Jbtzu1NnzSjEVeZmTA=";
       }
+      {
+        pr = 488591; # happy-coder: 0.11.2 -> 0.13.0
+        hash = "sha256-mlmZcwxP7IV93mQEAR3PYw8MRmNPRWXKbk9ZEKHqZc8=";
+      }
       # claude-code
       # {
       #   pr = 464698;