diff --git a/README.md b/README.md
index 9831f48270..59d2fd5dec 100644
--- a/README.md
+++ b/README.md
@@ -235,6 +235,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Microsoft 365 Integration | Fetch Teams messages, meeting transcripts, and SharePoint/OneDrive files as local Markdown for spec generation | `integration` | Read+Write | [spec-kit-m365](https://github.com/BenBtg/spec-kit-m365) |
 | Onboard | Contextual onboarding and progressive growth for developers new to spec-kit projects. Explains specs, maps dependencies, validates understanding, and guides the next step | `process` | Read+Write | [spec-kit-onboard](https://github.com/dmux/spec-kit-onboard) |
 | Optimize | Audit and optimize AI governance for context efficiency — token budgets, rule health, interpretability, compression, coherence, and echo detection | `process` | Read+Write | [spec-kit-optimize](https://github.com/sakitA/spec-kit-optimize) |
+| OWASP LLM Threat Model | OWASP Top 10 for LLM Applications 2025 threat analysis on agent artifacts | `code` | Read-only | [spec-kit-threatmodel](https://github.com/NaviaSamal/spec-kit-threatmodel) |
 | Plan Review Gate | Require spec.md and plan.md to be merged via MR/PR before allowing task generation | `process` | Read-only | [spec-kit-plan-review-gate](https://github.com/luno/spec-kit-plan-review-gate) |
 | PR Bridge | Auto-generate pull request descriptions, checklists, and summaries from spec artifacts | `process` | Read-only | [spec-kit-pr-bridge-](https://github.com/Quratulain-bilal/spec-kit-pr-bridge-) |
 | Presetify | Create and validate presets and preset catalogs | `process` | Read+Write | [presetify](https://github.com/mnriem/spec-kit-extensions/tree/main/presetify) |
diff --git a/extensions/catalog.community.json b/extensions/catalog.community.json
index c2d33aad95..9ce86110b5 100644
--- a/extensions/catalog.community.json
+++ b/extensions/catalog.community.json
@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-04-28T00:00:00Z",
+  "updated_at": "2026-04-28T12:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -2392,6 +2392,38 @@
       "created_at": "2026-04-10T00:00:00Z",
       "updated_at": "2026-04-10T00:00:00Z"
     },
+    "threatmodel": {
+      "name": "OWASP LLM Threat Model",
+      "id": "threatmodel",
+      "description": "OWASP Top 10 for LLM Applications 2025 threat analysis on agent artifacts",
+      "author": "NaviaSamal",
+      "version": "1.0.0",
+      "download_url": "https://github.com/NaviaSamal/spec-kit-threatmodel/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/NaviaSamal/spec-kit-threatmodel",
+      "homepage": "https://github.com/NaviaSamal/spec-kit-threatmodel",
+      "documentation": "https://github.com/NaviaSamal/spec-kit-threatmodel/blob/main/README.md",
+      "changelog": "https://github.com/NaviaSamal/spec-kit-threatmodel/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.6.0"
+      },
+      "provides": {
+        "commands": 1,
+        "hooks": 1
+      },
+      "tags": [
+        "security",
+        "owasp",
+        "threat-model",
+        "llm",
+        "analysis"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-04-25T00:00:00Z",
+      "updated_at": "2026-04-25T00:00:00Z"
+    },
     "v-model": {
       "name": "V-Model Extension Pack",
       "id": "v-model",