diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1c66f9c..6166ee4 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,17 +11,17 @@ repos:
       - id: check-toml
       - id: check-yaml
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: "v2.7.1"
+    rev: "v3.0.0-alpha.9-for-vscode"
     hooks:
       - id: prettier
         additional_dependencies:
           - prettier@2
   - repo: https://github.com/pre-commit/mirrors-eslint
-    rev: "v8.35.0"
+    rev: "v8.43.0"
     hooks:
       - id: eslint
         additional_dependencies:
           - eslint
           - eslint-config-prettier
           - eslint-plugin-unicorn
-          - prettier
+          - prettier@2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 010975a..756d3ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- blocked crawling of all pages other than index (#33)
+
 ## [2.4.4] - 2023-03-01
 
 ### Fixed
diff --git a/src/main.js b/src/main.js
index 0d24963..c4cbdd1 100644
--- a/src/main.js
+++ b/src/main.js
@@ -43,7 +43,7 @@ function normalizeUrl(url) {
 	if (!url.includes("http://") && !url.includes("https://")) {
 		url = "https://" + url;
 	}
-	if (url.charAt(url.length - 1) !== "/") {
+	if (url.at(-1) !== "/") {
 		url = url + "/";
 	}
 	return url;
diff --git a/src/static/robots.txt b/src/static/robots.txt
index c2a49f4..ac2ea8f 100644
--- a/src/static/robots.txt
+++ b/src/static/robots.txt
@@ -1,2 +1,29 @@
 User-agent: *
-Allow: /
+Allow: /$
+Disallow: /
+
+# Following borrowed from https://seirdy.one/robots.txt
+
+# I opt out of online advertising so malware that injects ads on my site won't get paid.
+# You should do the same.
+User-Agent: Adsbot
+Disallow: /
+
+# > This robot collects content from the Internet for the sole purpose of # helping educational institutions prevent plagiarism. [...] we compare student papers against the content we find on the Internet to see if we # can find similarities. (http://www.turnitin.com/robot/crawlerinfo.html)
+User-Agent: TurnitinBot
+Disallow: /
+
+# > NameProtect engages in crawling activity in search of a wide range of brand and other intellectual property violations that may be of interest to our clients. (http://www.nameprotect.com/botinfo.html)
+User-Agent: NPBot
+Disallow: /
+
+# iThenticate is a new service we have developed to combat the piracy of intellectual property and ensure the originality of written work for# publishers, non-profit agencies, corporations, and newspapers. (http://www.slysearch.com/)
+User-Agent: SlySearch
+Disallow: /
+
+# BLEXBot assists internet marketers to get information on the link structure of sites and their interlinking on the web, to avoid any technical and possible legal issues and improve overall online experience. (http://webmeup-crawler.com/)
+User-Agent: BLEXBot
+Disallow: /
+
+User-agent: ChatGPT-User
+Disallow: /