diff --git a/Casks/graphthulhu.rb b/Casks/graphthulhu.rb
new file mode 100644
index 0000000..d3fb7a5
--- /dev/null
+++ b/Casks/graphthulhu.rb
@@ -0,0 +1,40 @@
+cask "graphthulhu" do
+  version "0.4.0"
+
+  # To update checksums for a new version, run:
+  #   curl -sL https://github.com/skridlevsky/graphthulhu/releases/download/v<version>/checksums.txt
+  on_macos do
+    on_intel do
+      url "https://github.com/skridlevsky/graphthulhu/releases/download/v#{version}/graphthulhu_#{version}_darwin_amd64.tar.gz"
+      sha256 "bec4c6891fd6309a7114bf4a7ecb27e9fcc43b9b1532bbb1c637ebcb274d64eb"
+    end
+    on_arm do
+      url "https://github.com/skridlevsky/graphthulhu/releases/download/v#{version}/graphthulhu_#{version}_darwin_arm64.tar.gz"
+      sha256 "b4c962cb12f0bad00e047c1d5d6c5f00d827a094342d5689fc0b0ec3734670a4"
+    end
+  end
+
+  on_linux do
+    on_intel do
+      url "https://github.com/skridlevsky/graphthulhu/releases/download/v#{version}/graphthulhu_#{version}_linux_amd64.tar.gz"
+      sha256 "5de36682e46c02410c71aadea2c071f9b6bec6c4e183f4f6e8fa90c70ee47318"
+    end
+    on_arm do
+      url "https://github.com/skridlevsky/graphthulhu/releases/download/v#{version}/graphthulhu_#{version}_linux_arm64.tar.gz"
+      sha256 "794b026c28a4f5eeb2e82c8ef06a7078b01ad1dcedd373f7903e01d2c624c511"
+    end
+  end
+
+  name "graphthulhu"
+  desc "MCP knowledge graph server with Obsidian backend"
+  homepage "https://github.com/skridlevsky/graphthulhu"
+
+  livecheck do
+    url :url
+    strategy :github_latest
+  end
+
+  binary "graphthulhu"
+
+  # No zap stanza required
+end