diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1a6bdc1..7bd051ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,6 @@
 
 ## 1.6.3 (not yet released)
 * ADDED: Detect and report on damaged pastes (#1218)
-* CHANGED: Increase zlib compression level from 7 to 9
 * CHANGED: Upgrading libraries to: DOMpurify 3.0.8 & zlib 1.3.1
 * FIXED: Support more types of valid URLs for shorteners, incl. IDN ones (#1224)
 
diff --git a/js/zlib-1.3.1.js b/js/zlib-1.3.1.js
index fbfb7154..268d0841 100644
--- a/js/zlib-1.3.1.js
+++ b/js/zlib-1.3.1.js
@@ -6,7 +6,7 @@
     async function initialize() {
         if (ret) return ret;
 
-        const COMPRESSION_LEVEL = 9;
+        const COMPRESSION_LEVEL = 7;
         const NO_ZLIB_HEADER = -1;
         const CHUNK_SIZE = 32 * 1024;
         const map = {};
diff --git a/tpl/bootstrap.php b/tpl/bootstrap.php
index cea3da44..4f27907d 100644
--- a/tpl/bootstrap.php
+++ b/tpl/bootstrap.php
@@ -55,7 +55,7 @@ if ($ZEROBINCOMPATIBILITY) :
 <?php
 endif;
 ?>
-		<script type="text/javascript" data-cfasync="false" src="js/zlib-1.3.1.js" integrity="sha512-CkOlw41KBxjsbSqc/xyrAqY2gVuR9v9+l/zF8eoreGNoYYojXohe79wxJ0qrYXzadMXu3lStQMRTGfNXqHXe1Q==" crossorigin="anonymous"></script>
+		<script type="text/javascript" data-cfasync="false" src="js/zlib-1.3.1.js" integrity="sha512-VL3lLnt8EexTr22ze4a4HfVghpgY48c/Lhf4CcQa8bgYaIRRPjV1nP7EA8RiciGoXXQ1IeiU7tjrclPeVEfxOQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/base-x-4.0.0.js" integrity="sha512-nNPg5IGCwwrveZ8cA/yMGr5HiRS5Ps2H+s0J/mKTPjCPWUgFGGw7M5nqdnPD3VsRwCVysUh3Y8OWjeSKGkEQJQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/rawinflate-0.3.js" integrity="sha512-g8uelGgJW9A/Z1tB6Izxab++oj5kdD7B4qC7DHwZkB6DGMXKyzx7v5mvap2HXueI2IIn08YlRYM56jwWdm2ucQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/bootstrap-3.4.1.js" integrity="sha512-oBTprMeNEKCnqfuqKd6sbvFzmFQtlXS3e0C/RGFV0hD6QzhHV+ODfaQbAlmY6/q0ubbwlAM/nCJjkrgA3waLzg==" crossorigin="anonymous"></script>
diff --git a/tpl/page.php b/tpl/page.php
index 011415be..927666a5 100644
--- a/tpl/page.php
+++ b/tpl/page.php
@@ -34,7 +34,7 @@ if ($ZEROBINCOMPATIBILITY):
 <?php
 endif;
 ?>
-		<script type="text/javascript" data-cfasync="false" src="js/zlib-1.3.1.js" integrity="sha512-CkOlw41KBxjsbSqc/xyrAqY2gVuR9v9+l/zF8eoreGNoYYojXohe79wxJ0qrYXzadMXu3lStQMRTGfNXqHXe1Q==" crossorigin="anonymous"></script>
+		<script type="text/javascript" data-cfasync="false" src="js/zlib-1.3.1.js" integrity="sha512-VL3lLnt8EexTr22ze4a4HfVghpgY48c/Lhf4CcQa8bgYaIRRPjV1nP7EA8RiciGoXXQ1IeiU7tjrclPeVEfxOQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/base-x-4.0.0.js" integrity="sha512-nNPg5IGCwwrveZ8cA/yMGr5HiRS5Ps2H+s0J/mKTPjCPWUgFGGw7M5nqdnPD3VsRwCVysUh3Y8OWjeSKGkEQJQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/rawinflate-0.3.js" integrity="sha512-g8uelGgJW9A/Z1tB6Izxab++oj5kdD7B4qC7DHwZkB6DGMXKyzx7v5mvap2HXueI2IIn08YlRYM56jwWdm2ucQ==" crossorigin="anonymous"></script>
 <?php