diff --git a/lib/minify/matthiasmullie-minify/src/CSS.php b/lib/minify/matthiasmullie-minify/src/CSS.php
index ab0de8caa1f..09cedeee3a0 100644
--- a/lib/minify/matthiasmullie-minify/src/CSS.php
+++ b/lib/minify/matthiasmullie-minify/src/CSS.php
@@ -632,46 +632,7 @@ class CSS extends Minify
      */
     protected function stripComments()
     {
-        // PHP only supports $this inside anonymous functions since 5.4
-        $minifier = $this;
-        $callback = function ($match) use ($minifier) {
-            $count = count($minifier->extracted);
-            $placeholder = '/*' . $count . '*/';
-            $minifier->extracted[$placeholder] = $match[0];
-
-            return $placeholder;
-        };
-        // Moodle-specific change MDL-68191 starts.
-        /* This was the old code:
-        $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback);
-        */
-        // This is the new, more accurate and faster regex.
-        $this->registerPattern('/
-            # optional newline
-            \n?
-
-            # start comment
-            \/\*
-
-            # comment content
-            (?:
-                # either starts with an !
-                !
-            |
-                # or, after some number of characters which do not end the comment
-                (?:(?!\*\/).)*?
-
-                # there is either a @license or @preserve tag
-                @(?:license|preserve)
-            )
-
-            # then match to the end of the comment
-            .*?\*\/\n?
-
-            /ixs', $callback);
-        // Moodle-specific change MDL-68191.
-
-        $this->registerPattern('/\/\*.*?\*\//s', '');
+        $this->stripMultilineComments();
     }
 
     /**
diff --git a/lib/minify/matthiasmullie-minify/src/JS.php b/lib/minify/matthiasmullie-minify/src/JS.php
index ac5e98dd92e..d592b08bb33 100644
--- a/lib/minify/matthiasmullie-minify/src/JS.php
+++ b/lib/minify/matthiasmullie-minify/src/JS.php
@@ -198,28 +198,7 @@ class JS extends Minify
      */
     protected function stripComments()
     {
-        // PHP only supports $this inside anonymous functions since 5.4
-        $minifier = $this;
-        $callback = function ($match) use ($minifier) {
-            if (
-                substr($match[2], 0, 1) === '!' ||
-                strpos($match[2], '@license') !== false ||
-                strpos($match[2], '@preserve') !== false
-            ) {
-                // preserve multi-line comments that start with /*!
-                // or contain @license or @preserve annotations
-                $count = count($minifier->extracted);
-                $placeholder = '/*' . $count . '*/';
-                $minifier->extracted[$placeholder] = $match[0];
-
-                return $match[1] . $placeholder . $match[3];
-            }
-
-            return $match[1] . $match[3];
-        };
-
-        // multi-line comments
-        $this->registerPattern('/(\n?)\/\*(.*?)\*\/(\n?)/s', $callback);
+        $this->stripMultilineComments();
 
         // single-line comments
         $this->registerPattern('/\/\/.*$/m', '');
diff --git a/lib/minify/matthiasmullie-minify/src/Minify.php b/lib/minify/matthiasmullie-minify/src/Minify.php
index 19faf988601..f77478bebb7 100644
--- a/lib/minify/matthiasmullie-minify/src/Minify.php
+++ b/lib/minify/matthiasmullie-minify/src/Minify.php
@@ -260,6 +260,49 @@ abstract class Minify
         $this->patterns[] = array($pattern, $replacement);
     }
 
+    /**
+     * Both JS and CSS use the same form of multi-line comment, so putting the common code here.
+     */
+    protected function stripMultilineComments()
+    {
+        // First extract comments we want to keep, so they can be restored later
+        // PHP only supports $this inside anonymous functions since 5.4
+        $minifier = $this;
+        $callback = function ($match) use ($minifier) {
+            $count = count($minifier->extracted);
+            $placeholder = '/*'.$count.'*/';
+            $minifier->extracted[$placeholder] = $match[0];
+
+            return $placeholder;
+        };
+        $this->registerPattern('/
+            # optional newline
+            \n?
+
+            # start comment
+            \/\*
+
+            # comment content
+            (?:
+                # either starts with an !
+                !
+            |
+                # or, after some number of characters which do not end the comment
+                (?:(?!\*\/).)*?
+
+                # there is either a @license or @preserve tag
+                @(?:license|preserve)
+            )
+
+            # then match to the end of the comment
+            .*?\*\/\n?
+
+            /ixs', $callback);
+
+        // Then strip all other comments
+        $this->registerPattern('/\/\*.*?\*\//s', '');
+    }
+
     /**
      * We can't "just" run some regular expressions against JavaScript: it's a
      * complex language. E.g. having an occurrence of // xyz would be a comment,
diff --git a/lib/minify/readme_moodle.txt b/lib/minify/readme_moodle.txt
index 10ec71b21da..dc1ae657cff 100644
--- a/lib/minify/readme_moodle.txt
+++ b/lib/minify/readme_moodle.txt
@@ -15,10 +15,4 @@ mv path-converter-A.B.C/src/ /path/to/moodle/lib/minify/matthiasmullie-pathconve
 
 3) Apply the following patches:
 
-MDL-68191: https://github.com/matthiasmullie/minify/issues/317 is a bug that stops
-  large sections of the CSS from being minimised, and also is a huge performance drain.
-  We have applied the fix sent upstream because the performance win is so big.
-  (E.g. one case I measured, with the bug was 40 seconds to minify CSS, with the fix was
-  a few seconds. This is one of the reasons Behat runs in the browser are so slow.)
-  Whenever this library is updated check if the fix is included and remove this note.
-  NOTE: As of 2020/12/08, only the first commit was brought into Moodle
+N/A
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 9b6d7e60162..af59a103362 100644
--- a/lib/thirdpartylibs.xml
+++ b/lib/thirdpartylibs.xml
@@ -82,7 +82,7 @@
     <location>minify/matthiasmullie-minify</location>
     <name>MatthiasMullie\Minify</name>
     <description>CSS &amp; JavaScript minifier, in PHP</description>
-    <version>1.3.70</version>
+    <version>1.3.71</version>
     <license>MIT</license>
     <repository>https://github.com/matthiasmullie/minify</repository>
     <customised/>