diff --git a/CHANGELOG.md b/CHANGELOG.md
index af5d9d11fb0..b5305dd3118 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -561,6 +561,9 @@ where X.Y.Z is the semver of most recent plotly.js release.
 
 ## [1.49.5] -- 2019-09-18
 
+### Changed
+-  Drop support for IE10 and IE9 as part of browserify upgrade [#4168]
+
 ### Fixed
 - Clear rejected promises from queue when calling `Plotly.react` [#4197]
 - Do not attempt to remove non-existing mapbox layout source and layers [#4197]
diff --git a/devtools/test_dashboard/index.html b/devtools/test_dashboard/index.html
index 1d4682febe6..adbf9785223 100644
--- a/devtools/test_dashboard/index.html
+++ b/devtools/test_dashboard/index.html
@@ -19,10 +19,6 @@
   </div>
   <div id="snapshot"></div>
 
-  <!-- uncomment below for IE9/10 support -->
-  <!-- <script>if(typeof window.Int16Array !== 'function')document.write("<scri"+"pt src='../../dist/extras/typedarray.min.js'></scr"+"ipt>");</script>
-  <script>document.write("<scri"+"pt src='../../dist/extras/request_animation_frame.js'></scr"+"ipt>");</script> -->
-
   <script src="../../dist/extras/mathjax/MathJax.js?config=TeX-AMS-MML_SVG"></script>
   <script id="source" src="../../build/plotly.js" charset="utf-8"></script>
   <script src="../../build/test_dashboard-bundle.js" charset="utf-8"></script>
diff --git a/dist/README.md b/dist/README.md
index 346c491c458..a1dc31bcffb 100644
--- a/dist/README.md
+++ b/dist/README.md
@@ -14,15 +14,6 @@ or the un-minified version as:
 <script src="plotly.js" charset="utf-8"></script>
 ```
 
-### To support IE9
-
-*Before* the plotly.js script tag, add:
-
-```html
-<script>if(typeof window.Int16Array !== 'function')document.write("<scri"+"pt src='extras/typedarray.min.js'></scr"+"ipt>");</script>
-<script>document.write("<scri"+"pt src='extras/request_animation_frame.js'></scr"+"ipt>");</script>
-```
-
 ### To support MathJax
 
 *Before* the plotly.js script tag, add:
diff --git a/tasks/stats.js b/tasks/stats.js
index 63ec0e50ab4..dbb535bebe0 100644
--- a/tasks/stats.js
+++ b/tasks/stats.js
@@ -46,15 +46,6 @@ function getInfoContent() {
         '<script src="plotly.js" charset="utf-8"></script>',
         '```',
         '',
-        '### To support IE9',
-        '',
-        '*Before* the plotly.js script tag, add:',
-        '',
-        '```html',
-        '<script>if(typeof window.Int16Array !== \'function\')document.write("<scri"+"pt src=\'extras/typedarray.min.js\'></scr"+"ipt>");</script>',
-        '<script>document.write("<scri"+"pt src=\'extras/request_animation_frame.js\'></scr"+"ipt>");</script>',
-        '```',
-        '',
         '### To support MathJax',
         '',
         '*Before* the plotly.js script tag, add:',