diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 730de26e..1667ed8c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,11 +16,16 @@ jobs:
       run: composer install --prefer-dist --no-dev
 
   PHPunit:
+    name: PHP ${{ matrix.php-versions }} unit tests on ${{ matrix.operating-system }}
     runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
     strategy:
       matrix:
-        php-versions: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
-    name: PHP ${{ matrix.php-versions }} unit tests on ${{ matrix.operating-system }}
+        php-versions: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
+        experimental: [false]
+        include:
+          - php-versions: '8.4' # development release, things can break
+            experimental: true
     env:
       extensions: gd, sqlite3
       extensions-cache-key-name: phpextensions
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18804dbc..b7f07666 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 * CHANGED: Set `lang` cookie with lax `SameSite` property
 * FIXED: Add cache control headers also to API calls (#1263)
 * FIXED: Shortened paste URL does not appear in email (#606)
+* CHANGED: Upgrading libraries to: DOMpurify 3.1.2 (#1299)
 
 ## 1.7.1 (2024-02-11)
 * FIXED: zlib 1.3.1 wasm file reference
diff --git a/js/common.js b/js/common.js
index 4519030f..5dc9203c 100644
--- a/js/common.js
+++ b/js/common.js
@@ -17,7 +17,7 @@ require('./prettify');
 global.prettyPrint = window.PR.prettyPrint;
 global.prettyPrintOne = window.PR.prettyPrintOne;
 global.showdown = require('./showdown-2.1.0');
-global.DOMPurify = require('./purify-3.0.8');
+global.DOMPurify = require('./purify-3.1.2');
 global.baseX = require('./base-x-4.0.0').baseX;
 global.Legacy = require('./legacy').Legacy;
 require('./bootstrap-3.4.1');
diff --git a/js/purify-3.0.8.js b/js/purify-3.0.8.js
deleted file mode 100644
index 9f090115..00000000
--- a/js/purify-3.0.8.js
+++ /dev/null
@@ -1,2 +0,0 @@
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diff --git a/tpl/bootstrap.php b/tpl/bootstrap.php
index 9b6a7c58..07fd17cf 100644
--- a/tpl/bootstrap.php
+++ b/tpl/bootstrap.php
@@ -71,7 +71,7 @@ if ($MARKDOWN) :
 <?php
 endif;
 ?>
-		<script type="text/javascript" data-cfasync="false" src="js/purify-3.0.8.js" integrity="sha512-wWBDKh5wYGtJ1Df+PPZIn59jHVBnJ4/Yb2W/pVnzaXab8cmlZnHVx+FEBGu5JX39s3P2Qlt+aNQou0XnjW86hg==" crossorigin="anonymous"></script>
+		<script type="text/javascript" data-cfasync="false" src="js/purify-3.1.2.js" integrity="sha512-voYCOVXik5/jcT+McTiptsB00iB0NWQrhBmSwSEfj0IH3UDphU8w12JV8w1y+m8FRaozbzW4efHSEWKZpOA+JQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/legacy.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-LYos+qXHIRqFf5ZPNphvtTB0cgzHUizu2wwcOwcwz/VIpRv9lpcBgPYz4uq6jx0INwCAj6Fbnl5HoKiLufS2jg==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/privatebin.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-hqatct2X1I7GZZFAvbnaWU+QPz+cIhBQIxhXtR50aq+pTfhvUljqzqoLi4Yli6P+GIV6IFlm5Yf/uvdEvSjMcA==" crossorigin="anonymous"></script>
 		<!-- icon -->
diff --git a/tpl/page.php b/tpl/page.php
index a5cd9fbb..2abe4cc8 100644
--- a/tpl/page.php
+++ b/tpl/page.php
@@ -49,7 +49,7 @@ if ($MARKDOWN):
 <?php
 endif;
 ?>
-		<script type="text/javascript" data-cfasync="false" src="js/purify-3.0.8.js" integrity="sha512-wWBDKh5wYGtJ1Df+PPZIn59jHVBnJ4/Yb2W/pVnzaXab8cmlZnHVx+FEBGu5JX39s3P2Qlt+aNQou0XnjW86hg==" crossorigin="anonymous"></script>
+		<script type="text/javascript" data-cfasync="false" src="js/purify-3.1.2.js" integrity="sha512-voYCOVXik5/jcT+McTiptsB00iB0NWQrhBmSwSEfj0IH3UDphU8w12JV8w1y+m8FRaozbzW4efHSEWKZpOA+JQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/legacy.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-LYos+qXHIRqFf5ZPNphvtTB0cgzHUizu2wwcOwcwz/VIpRv9lpcBgPYz4uq6jx0INwCAj6Fbnl5HoKiLufS2jg==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/privatebin.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-hqatct2X1I7GZZFAvbnaWU+QPz+cIhBQIxhXtR50aq+pTfhvUljqzqoLi4Yli6P+GIV6IFlm5Yf/uvdEvSjMcA==" crossorigin="anonymous"></script>
 		<!-- icon -->