diff --git a/cms/static/cms/js/require-config.js b/cms/static/cms/js/require-config.js
index 6bcdbb88ac..4e5be98dfc 100644
--- a/cms/static/cms/js/require-config.js
+++ b/cms/static/cms/js/require-config.js
@@ -70,7 +70,7 @@ require.config({
         // end of Annotation tool files
 
         // externally hosted files
-        "mathjax": "//cdn.mathjax.org/mathjax/2.5-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
+        "mathjax": "//cdn.mathjax.org/mathjax/2.4-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
         "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/coffee/spec/main.coffee b/cms/static/coffee/spec/main.coffee
index a2a5cb3083..14315b5236 100644
--- a/cms/static/coffee/spec/main.coffee
+++ b/cms/static/coffee/spec/main.coffee
@@ -51,7 +51,7 @@ requirejs.config({
         "URI": "xmodule_js/common_static/js/vendor/URI.min",
         "mock-ajax": "xmodule_js/common_static/js/vendor/mock-ajax",
 
-        "mathjax": "//cdn.mathjax.org/mathjax/2.5-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
+        "mathjax": "//cdn.mathjax.org/mathjax/2.4-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
         "youtube": "//www.youtube.com/player_api?noext",
 
         "coffee/src/ajax_prefix": "xmodule_js/common_static/coffee/src/ajax_prefix",
diff --git a/cms/static/coffee/spec/main_squire.coffee b/cms/static/coffee/spec/main_squire.coffee
index 20cb7bc7a0..f9053e5e3b 100644
--- a/cms/static/coffee/spec/main_squire.coffee
+++ b/cms/static/coffee/spec/main_squire.coffee
@@ -42,7 +42,7 @@ requirejs.config({
         "domReady": "xmodule_js/common_static/js/vendor/domReady",
         "URI": "xmodule_js/common_static/js/vendor/URI.min",
 
-        "mathjax": "//cdn.mathjax.org/mathjax/2.5-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
+        "mathjax": "//cdn.mathjax.org/mathjax/2.4-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured",
         "youtube": "//www.youtube.com/player_api?noext",
 
         "coffee/src/ajax_prefix": "xmodule_js/common_static/coffee/src/ajax_prefix"
diff --git a/common/templates/mathjax_include.html b/common/templates/mathjax_include.html
index 4b20473367..f15fc0fc67 100644
--- a/common/templates/mathjax_include.html
+++ b/common/templates/mathjax_include.html
@@ -50,4 +50,4 @@
 <!-- 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.mathjax.org/mathjax/2.5-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full"></script>
+<script type="text/javascript" src="https://cdn.mathjax.org/mathjax/2.4-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full"></script>
diff --git a/lms/static/js/spec/main.js b/lms/static/js/spec/main.js
index 01bbb5c0c5..752bdefc75 100644
--- a/lms/static/js/spec/main.js
+++ b/lms/static/js/spec/main.js
@@ -49,7 +49,7 @@
             'jasmine.async': 'xmodule_js/common_static/js/vendor/jasmine.async',
             'draggabilly': 'xmodule_js/common_static/js/vendor/draggabilly.pkgd',
             'domReady': 'xmodule_js/common_static/js/vendor/domReady',
-            'mathjax': '//cdn.mathjax.org/mathjax/2.5-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured', // jshint ignore:line
+            'mathjax': '//cdn.mathjax.org/mathjax/2.4-latest/MathJax.js?config=TeX-MML-AM_HTMLorMML-full&delayStartupUntil=configured', // jshint ignore:line
             'youtube': '//www.youtube.com/player_api?noext',
             'coffee/src/ajax_prefix': 'xmodule_js/common_static/coffee/src/ajax_prefix',
             'coffee/src/instructor_dashboard/student_admin': 'coffee/src/instructor_dashboard/student_admin',