diff --git a/Makefile b/Makefile
index 601689636..a615ac011 100644
--- a/Makefile
+++ b/Makefile
@@ -50,12 +50,17 @@ install-bin:
 	install -m 755 lem $(PREFIX)/bin
 
 # TODO: on the fly edit lem.desktop depends on $(PREFIX)
-install-desktop: 
+install-desktop:
 	install -m 644 scripts/install/lem.svg /usr/share/icons/hicolor/scalable/apps/
 	gtk-update-icon-cache /usr/share/icons/hicolor
 	install -m 644 scripts/install/lem-$(VARIANT).desktop /usr/share/applications/lem.desktop
 
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Darwin)
+install: install-bin
+else
 install: install-bin install-desktop
+endif
 	@echo "+--------------------------------+"
 	@echo "|   Lem installation complete!   |"
 	@echo "+--------------------------------+"
@@ -144,5 +149,22 @@ lint:
 	.qlot/bin/sblint extensions/yaml-mode/lem-yaml-mode.asd
 	.qlot/bin/sblint extensions/ruby-mode/lem-ruby-mode.asd
 
+resources/lem.icns: resources/lem.png
+	mkdir -p resources/lem.iconset
+	sips -z 16 16     $< --out resources/lem.iconset/icon_16x16.png
+	sips -z 32 32     $< --out resources/lem.iconset/icon_16x16@2x.png
+	sips -z 32 32     $< --out resources/lem.iconset/icon_32x32.png
+	sips -z 64 64     $< --out resources/lem.iconset/icon_32x32@2x.png
+	sips -z 128 128   $< --out resources/lem.iconset/icon_128x128.png
+	sips -z 256 256   $< --out resources/lem.iconset/icon_128x128@2x.png
+	sips -z 256 256   $< --out resources/lem.iconset/icon_256x256.png
+	sips -z 256 256   $< --out resources/lem.iconset/icon_256x256@2x.png
+	sips -z 256 256   $< --out resources/lem.iconset/icon_512x512.png
+	sips -z 256 256   $< --out resources/lem.iconset/icon_512x512@2x.png
+	iconutil -c icns resources/lem.iconset -o $@
+	rm -rf resources/lem.iconset
+
+icns: resources/lem.icns
+
 AppImage:
 	docker buildx build -f docker/Dockerfile-AppImage --progress=plain --target artifact --output type=local,dest=./artifacts .
diff --git a/scripts/macos-deploy.bash b/scripts/macos-deploy.bash
index 69f881b9a..e09228916 100755
--- a/scripts/macos-deploy.bash
+++ b/scripts/macos-deploy.bash
@@ -11,7 +11,8 @@ cd "$parent_dir"
 qlot install
 qlot exec sbcl --eval '(ql:quickload :lem)' --eval '(asdf:make :lem)'
 
-# アイコン（存在しなくても続行）
+# アイコン（.icns for macOS dock/taskbar icon, .png as fallback）
+cp resources/lem.icns bin/lem.app/Contents/Resources/ || true
 cp resources/lem.png bin/lem.app/Contents/Resources/ || true
 
 # ===== 2) OpenSSL を同梱し、参照先を @loader_path 化 =====
diff --git a/src/macosx.lisp b/src/macosx.lisp
index 951f3e851..76e25e1c0 100644
--- a/src/macosx.lisp
+++ b/src/macosx.lisp
@@ -10,3 +10,13 @@
               (let ((dir (user-homedir-pathname)))
                 (setq *default-pathname-defaults* dir)
                 (uiop:chdir dir)))))
+
+;; Tell the deploy library not to bundle tree-sitter native libraries.
+;; They are optional and loaded at runtime only when available.
+(when (find-package :tree-sitter/ffi)
+  (let ((ts (find-symbol "TREE-SITTER" :tree-sitter/ffi))
+        (tw (find-symbol "TS-WRAPPER" :tree-sitter/ffi)))
+    (when ts
+      (setf (deploy:library-dont-deploy-p (deploy:ensure-library ts)) T))
+    (when tw
+      (setf (deploy:library-dont-deploy-p (deploy:ensure-library tw)) T))))