diff --git a/.dev.vars.example b/.dev.vars.example
index be2a8b9..293e851 100644
--- a/.dev.vars.example
+++ b/.dev.vars.example
@@ -3,6 +3,6 @@ MATOMO_SITE_ID=1
 MATOMO_TIMEOUT_MS=5000
 LOG_LEVEL=debug
 HTTP_METHOD_ALLOWLIST=GET
-USER_AGENT_ALLOWLIST_REGEX=(?:ChatGPT-User|MistralAI-User|Gemini-Deep-Research|Claude-User|Perplexity-User|Google-NotebookLM)
+USER_AGENT_ALLOWLIST_REGEX=(?:ChatGPT-User|MistralAI-User|Gemini-Deep-Research|Claude-User|Perplexity-User|Google-NotebookLM|Google-GeminiNotebook)
 URL_EXCLUDE_REGEX=^[^?]+\.(?:css|js|mjs|map|json|xml|webmanifest|manifest|png|jpe?g|gif|webp|avif|svg|ico|bmp|tiff?|woff2?|ttf|otf|eot|rss|atom|wasm|txt)(?:\?|$)
 DOCUMENT_REGEX=^[^?]+\.(?:pdf|docx?|xlsx?|pptx?|csv|json|txt|xml|epub|mobi|azw3|mp3|mp4|mpe?g|webm|mov|avi|ogg|wav|flac|zip|gz|gzip|tgz|tar|bz2|tbz|7z|rar|dmg|exe|msi|apk|jar|md5|sig)(?:\?|$)
diff --git a/README.md b/README.md
index b56cd38..3f96750 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Cloudflare Worker (TypeScript, Node 24 tooling) that sits inline on your zone, p
   Example: `^[^?]+\\.(?:pdf|zip|docx?)(?:\\?|$)`
 
 - `LOG_LEVEL` (optional, default `warn`): `silent|error|warn|info|debug`.
-- `USER_AGENT_ALLOWLIST_REGEX` (optional): Case-insensitive regex to permit user agents; non-matching entries are skipped. Defaults to an allowlist for `ChatGPT-User|MistralAI-User|Gemini-Deep-Research|Claude-User|Perplexity-User|Google-NotebookLM`.
+- `USER_AGENT_ALLOWLIST_REGEX` (optional): Case-insensitive regex to permit user agents; non-matching entries are skipped. Defaults to an allowlist for `ChatGPT-User|MistralAI-User|Gemini-Deep-Research|Claude-User|Perplexity-User|Google-NotebookLM|Google-GeminiNotebook`.
 - `URL_EXCLUDE_REGEX` (optional): Case-insensitive regex to skip tracking for matching URLs. This regex runs against the full URL (`protocol://host/path?query`) and defaults to excluding common static assets and non-page resources:
   - Frontend assets: `.css`, `.js`, `.mjs`
   - Source maps: `.map`
diff --git a/src/config.ts b/src/config.ts
index d990e72..54e7d7b 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -17,7 +17,8 @@ const defaultUserAgentPatterns = [
   'Gemini-Deep-Research',
   'Claude-User',
   'Perplexity-User',
-  'Google-NotebookLM'
+  'Google-NotebookLM',
+  'Google-GeminiNotebook'
 ];
 const defaultAllowlistPattern = `(?:${defaultUserAgentPatterns
   .map(escapeRegex)
diff --git a/tests/config.test.ts b/tests/config.test.ts
index 4087c27..a5c675c 100644
--- a/tests/config.test.ts
+++ b/tests/config.test.ts
@@ -17,7 +17,7 @@ describe('getConfig', () => {
       httpMethodAllowlist: ['GET']
     });
     expect(config.userAgentAllowlistRegex).toEqual(
-      /(?:ChatGPT-User|MistralAI-User|Gemini-Deep-Research|Claude-User|Perplexity-User|Google-NotebookLM)/i
+      /(?:ChatGPT-User|MistralAI-User|Gemini-Deep-Research|Claude-User|Perplexity-User|Google-NotebookLM|Google-GeminiNotebook)/i
     );
     expect(config.urlExcludeRegex).toEqual(
       /^[^?]+\.(?:css|js|mjs|map|json|xml|webmanifest|manifest|png|jpe?g|gif|webp|avif|svg|ico|bmp|tiff?|woff2?|ttf|otf|eot|rss|atom|wasm|txt)(?:\?|$)/i
@@ -27,6 +27,20 @@ describe('getConfig', () => {
     );
   });
 
+  it('allows both NotebookLM user agent tokens by default', () => {
+    const { userAgentAllowlistRegex } = getConfig({ ...baseEnv });
+    const userAgents = [
+      // current desktop and mobile agents
+      'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36 (compatible; Google-GeminiNotebook; +https://developers.google.com/crawling/docs/crawlers-fetchers/google-gemininotebook)',
+      'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Mobile Safari/537.36 (compatible; Google-GeminiNotebook; +https://developers.google.com/crawling/docs/crawlers-fetchers/google-gemininotebook)',
+      // former agent, supported until August 2026
+      'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 (compatible; Google-NotebookLM; +https://developers.google.com/crawling/docs/crawlers-fetchers/google-notebooklm)'
+    ];
+    for (const userAgent of userAgents) {
+      expect(userAgentAllowlistRegex?.test(userAgent)).toBe(true);
+    }
+  });
+
   it('uses optional overrides', () => {
     const config = getConfig({
       ...baseEnv,