diff --git a/cms/djangoapps/pipeline_js/js/xmodule.js b/cms/djangoapps/pipeline_js/js/xmodule.js
index 8a19355c1a93..3f291cd5fcdc 100644
--- a/cms/djangoapps/pipeline_js/js/xmodule.js
+++ b/cms/djangoapps/pipeline_js/js/xmodule.js
@@ -18,7 +18,7 @@ define(
         window._ = _;
 
         $script(
-            'https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js'
+            'https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js'
             + '?config=TeX-MML-AM_SVG&delayStartupUntil=configured',
             'mathjax',
             function() {
diff --git a/cms/static/cms/js/require-config.js b/cms/static/cms/js/require-config.js
index d2bc6341ebba..70bf6b130600 100644
--- a/cms/static/cms/js/require-config.js
+++ b/cms/static/cms/js/require-config.js
@@ -137,7 +137,7 @@
             'jquery_extend_patch': 'js/src/jquery_extend_patch',
 
             // externally hosted files
-            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_SVG&delayStartupUntil=configured', // eslint-disable-line max-len
+            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_SVG&delayStartupUntil=configured', // eslint-disable-line max-len
             'youtube': [
                 // youtube URL does not end in '.js'. We add '?noext' to the path so
                 // that require.js adds the '.js' to the query component of the URL,
diff --git a/cms/static/cms/js/spec/main.js b/cms/static/cms/js/spec/main.js
index 6a9aaf2e2424..9aa38a052dc5 100644
--- a/cms/static/cms/js/spec/main.js
+++ b/cms/static/cms/js/spec/main.js
@@ -69,7 +69,7 @@
             'domReady': 'xmodule_js/common_static/js/vendor/domReady',
             'URI': 'xmodule_js/common_static/js/vendor/URI.min',
             'mock-ajax': 'xmodule_js/common_static/js/vendor/mock-ajax',
-            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_SVG&delayStartupUntil=configured', // eslint-disable-line max-len
+            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_SVG&delayStartupUntil=configured', // eslint-disable-line max-len
             'youtube': '//www.youtube.com/player_api?noext',
             'js/src/ajax_prefix': 'xmodule_js/common_static/js/src/ajax_prefix',
             'js/spec/test_utils': 'js/spec/test_utils'
diff --git a/cms/static/cms/js/spec/main_squire.js b/cms/static/cms/js/spec/main_squire.js
index 8feb05692273..9885a70d28e1 100644
--- a/cms/static/cms/js/spec/main_squire.js
+++ b/cms/static/cms/js/spec/main_squire.js
@@ -48,7 +48,7 @@
             'draggabilly': 'xmodule_js/common_static/js/vendor/draggabilly',
             'domReady': 'xmodule_js/common_static/js/vendor/domReady',
             'URI': 'xmodule_js/common_static/js/vendor/URI.min',
-            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_SVG&delayStartupUntil=configured', // eslint-disable-line max-len
+            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_SVG&delayStartupUntil=configured', // eslint-disable-line max-len
             'youtube': '//www.youtube.com/player_api?noext',
             'js/src/ajax_prefix': 'xmodule_js/common_static/js/src/ajax_prefix'
         },
diff --git a/common/static/common/js/discussion/mathjax_include.js b/common/static/common/js/discussion/mathjax_include.js
index 074354566e1b..7a9a24aadb1e 100644
--- a/common/static/common/js/discussion/mathjax_include.js
+++ b/common/static/common/js/discussion/mathjax_include.js
@@ -51,6 +51,6 @@ if (typeof MathJax === 'undefined') {
             explorer: true
         }
     };
-    vendorScript.src = 'https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_HTMLorMML';
+    vendorScript.src = 'https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_HTMLorMML';
     document.body.appendChild(vendorScript);
 }
diff --git a/common/templates/mathjax_include.html b/common/templates/mathjax_include.html
index ead5a935ee94..edb20c726b23 100644
--- a/common/templates/mathjax_include.html
+++ b/common/templates/mathjax_include.html
@@ -116,5 +116,5 @@
 <!-- This must appear after all mathjax-config blocks, so it is after the imports from the other templates.
      It can't be run through static.url because MathJax uses crazy url introspection to do lazy loading of
      MathJax extension libraries -->
-<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_SVG"></script>
+<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_SVG"></script>
 %endif
diff --git a/common/templates/xblock_v2/xblock_iframe.html b/common/templates/xblock_v2/xblock_iframe.html
index 358765c85eb4..0802b398f8c7 100644
--- a/common/templates/xblock_v2/xblock_iframe.html
+++ b/common/templates/xblock_v2/xblock_iframe.html
@@ -187,7 +187,7 @@
   <!-- This must appear after all mathjax-config blocks, so it is after the imports from the other templates.
        It can't be run through static.url because MathJax uses crazy url introspection to do lazy loading of
        MathJax extension libraries -->
-  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_SVG"></script>
+  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_SVG"></script>
   <!-- fragment head -->
   {{ fragment.head_html | safe }}
 </head>
diff --git a/lms/static/lms/js/spec/main.js b/lms/static/lms/js/spec/main.js
index d8bc1417e86e..d56db0dbd534 100644
--- a/lms/static/lms/js/spec/main.js
+++ b/lms/static/lms/js/spec/main.js
@@ -56,7 +56,7 @@
             'squire': 'common/js/vendor/Squire',
             'jasmine-imagediff': 'xmodule_js/common_static/js/vendor/jasmine-imagediff',
             'domReady': 'xmodule_js/common_static/js/vendor/domReady',
-            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.5/MathJax.js?config=TeX-MML-AM_HTMLorMML&delayStartupUntil=configured', // eslint-disable-line max-len
+            mathjax: 'https://cdn.jsdelivr.net/npm/mathjax@2.7.9/MathJax.js?config=TeX-MML-AM_HTMLorMML&delayStartupUntil=configured', // eslint-disable-line max-len
             'youtube': '//www.youtube.com/player_api?noext',
             'js/src/ajax_prefix': 'xmodule_js/common_static/js/src/ajax_prefix',
             'js/instructor_dashboard/student_admin': 'js/instructor_dashboard/student_admin',