diff --git a/package.json b/package.json
index b4261a92..35babc47 100644
--- a/package.json
+++ b/package.json
@@ -69,7 +69,7 @@
     "istanbul": "^0.4.5",
     "mocha": "^5.0.0",
     "sinon": "^4.3.0",
-    "text-encoder-lite": "^1.0.1",
+    "text-encoding-utf-8": "^1.0.2",
     "whatwg-fetch": "^2.0.3"
   },
   "dependencies": {
diff --git a/src/packet/literal.js b/src/packet/literal.js
index 5ba46026..f1e2b26c 100644
--- a/src/packet/literal.js
+++ b/src/packet/literal.js
@@ -65,7 +65,7 @@ Literal.prototype.setText = function(text, format='utf8') {
 Literal.prototype.getText = function(clone=false) {
   if (this.text === null || util.isStream(this.text)) { // Assume that this.text has been read
     let lastChar = '';
-    const decoder = new TextDecoder('utf8');
+    const decoder = new TextDecoder('utf-8');
     // eslint-disable-next-line no-inner-declarations
     function process(value, lastChunk=false) {
       // decode UTF8
diff --git a/src/polyfills.js b/src/polyfills.js
index 502482ed..6b462083 100644
--- a/src/polyfills.js
+++ b/src/polyfills.js
@@ -20,6 +20,9 @@ if (typeof window !== 'undefined') {
   if (typeof Array.prototype.find === 'undefined') {
     require('core-js/fn/array/find');
   }
+  if (typeof Array.prototype.includes === 'undefined') {
+    require('core-js/fn/array/includes');
+  }
   if (typeof Array.from === 'undefined') {
     require('core-js/fn/array/from');
   }
@@ -48,5 +51,5 @@ if (typeof TextDecoder === 'undefined') {
   global.TextDecoder = util.getNodeTextDecoder();
 }
 if (typeof TextDecoder === 'undefined') {
-  global.TextDecoder = require('text-encoder-lite');
+  global.TextDecoder = require('text-encoding-utf-8').TextDecoder;
 }
diff --git a/src/stream.js b/src/stream.js
index c0d23c5d..5f099168 100644
--- a/src/stream.js
+++ b/src/stream.js
@@ -361,7 +361,7 @@ function slice(input, begin=0, end=Infinity) {
   if (input[externalBuffer]) {
     input = util.concat(input[externalBuffer].concat([input]));
   }
-  if (util.isUint8Array(input)) {
+  if (util.isUint8Array(input) && !util.isIE11) { // IE11 subarray is buggy
     return input.subarray(begin, end);
   }
   return input.slice(begin, end);
diff --git a/src/util.js b/src/util.js
index 50175cfe..8421344c 100644
--- a/src/util.js
+++ b/src/util.js
@@ -34,6 +34,8 @@ import stream from './stream';
 const isIE11 = typeof navigator !== 'undefined' && !!navigator.userAgent.match(/Trident\/7\.0.*rv:([0-9.]+).*\).*Gecko$/);
 
 export default {
+  isIE11,
+
   isString: function(data) {
     return typeof data === 'string' || String.prototype.isPrototypeOf(data);
   },