diff --git a/CHANGELOG.md b/CHANGELOG.md
index 32cc8024..e4899f61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+SystemJS 3.1.3 (2019/04/18)
+* Add Web Worker support to the s.js build (https://github.com/systemjs/systemjs/commits/cbea1530a194d7)
+* Fix an IE11 bug due to object shorthand (https://github.com/systemjs/systemjs/commits/551b2e8ec7bda1)
+
 SystemJS 3.1.2 (2019/04/13)
 * Fix an async execution bug in s.js (https://github.com/systemjs/systemjs/issues/1924, https://github.com/systemjs/systemjs/commits/c274caa172b03b24)
 
diff --git a/dist/extras/amd.js b/dist/extras/amd.js
index 59b9c388..9ee9bd86 100644
--- a/dist/extras/amd.js
+++ b/dist/extras/amd.js
@@ -101,7 +101,7 @@
     if (typeof name === 'string') {
       if (amdDefineDeps) {
         if (!System.registerRegistry)
-          throw new Error('Include the named register extension named AMD support in SystemJS.');
+          throw new Error('Include the named register extension for SystemJS named AMD support.');
         System.registerRegistry[name] = createAMDRegister(deps, execute);
         amdDefineDeps = [];
         amdDefineExec = emptyFn;
diff --git a/dist/extras/amd.min.js b/dist/extras/amd.min.js
index aaa9e7e7..4937482b 100644
--- a/dist/extras/amd.min.js
+++ b/dist/extras/amd.min.js
@@ -1 +1 @@
-!function(e){const t=System.constructor.prototype,r=[[],function(){return{}}];function n(){throw new Error("AMD require not supported.")}function o(){}const s=["require","exports","module"];function i(e,t){const r={},o={exports:r},s=[],i=[];let u=0;for(let t=0;t<e.length;t++){const f=e[t],c=i.length;if("require"===f)s[t]=n,u++;else if("module"===f)s[t]=o,u++;else if("exports"===f)s[t]=r,u++;else{const e=t;i.push(function(t){s[e]=t.default})}u&&(e[c]=f)}u&&(e.length-=u);const f=t;return[e,function(e){return e("default",r),{setters:i,execute:function(){o.exports=f.apply(r,s)||o.exports,r!==o.exports&&e("default",o.exports)}}}]}let u;const f=t.register;3===f.length?t.register=function(e,t,r){"string"!=typeof e&&(u=t),f.apply(this,arguments)}:t.register=function(e,t){u=t,f.apply(this,arguments)};const c=t.getRegister;let l,p;t.getRegister=function(){const e=c.call(this);if(e&&e[1]===u)return e;if(!l)return e||r;const t=i(l,p);return l=null,t},e.define=function(e,t,r){if("string"==typeof e){if(l){if(!System.registerRegistry)throw new Error("Include the named register extension named AMD support in SystemJS.");return System.registerRegistry[e]=i(t,r),l=[],void(p=o)}System.registerRegistry&&(System.registerRegistry[e]=i(t,r)),e=t,t=r}e instanceof Array?(l=e,p=t):"object"==typeof e?(l=[],p=function(){return e}):"function"==typeof e&&(l=s,p=e)},e.define.amd={}}("undefined"!=typeof self?self:global);
\ No newline at end of file
+!function(e){const t=System.constructor.prototype,r=[[],function(){return{}}];function n(){throw new Error("AMD require not supported.")}function o(){}const s=["require","exports","module"];function i(e,t){const r={},o={exports:r},s=[],i=[];let f=0;for(let t=0;t<e.length;t++){const u=e[t],c=i.length;if("require"===u)s[t]=n,f++;else if("module"===u)s[t]=o,f++;else if("exports"===u)s[t]=r,f++;else{const e=t;i.push(function(t){s[e]=t.default})}f&&(e[c]=u)}f&&(e.length-=f);const u=t;return[e,function(e){return e("default",r),{setters:i,execute:function(){o.exports=u.apply(r,s)||o.exports,r!==o.exports&&e("default",o.exports)}}}]}let f;const u=t.register;3===u.length?t.register=function(e,t,r){"string"!=typeof e&&(f=t),u.apply(this,arguments)}:t.register=function(e,t){f=t,u.apply(this,arguments)};const c=t.getRegister;let l,p;t.getRegister=function(){const e=c.call(this);if(e&&e[1]===f)return e;if(!l)return e||r;const t=i(l,p);return l=null,t},e.define=function(e,t,r){if("string"==typeof e){if(l){if(!System.registerRegistry)throw new Error("Include the named register extension for SystemJS named AMD support.");return System.registerRegistry[e]=i(t,r),l=[],void(p=o)}System.registerRegistry&&(System.registerRegistry[e]=i(t,r)),e=t,t=r}e instanceof Array?(l=e,p=t):"object"==typeof e?(l=[],p=function(){return e}):"function"==typeof e&&(l=s,p=e)},e.define.amd={}}("undefined"!=typeof self?self:global);
\ No newline at end of file
diff --git a/dist/extras/amd.min.js.map b/dist/extras/amd.min.js.map
index 777a81f7..ec113a55 100644
--- a/dist/extras/amd.min.js.map
+++ b/dist/extras/amd.min.js.map
@@ -1 +1 @@
-{"version":3,"sources":["amd.js"],"names":["global","systemPrototype","System","constructor","prototype","emptyInstantiation","unsupportedRequire","Error","emptyFn","requireExportsModule","createAMDRegister","amdDefineDeps","amdDefineExec","exports","module","depModules","setters","splice","i","length","id","index","idx","push","ns","default","amdExec","_export","execute","apply","lastRegisterDeclare","systemRegister","register","name","deps","declare","this","arguments","getRegister","call","registration","define","registerRegistry","Array","amd","self"],"mappings":"CAGA,SAAWA,GACT,MAAMC,EAAkBC,OAAOC,YAAYC,UAErCC,EAAqB,CAAC,GAAI,WAAc,MAAO,KAErD,SAASC,IACP,MAAM,IAAIC,MAAM,8BAGlB,SAASC,KAET,MAAMC,EAAuB,CAAC,UAAW,UAAW,UAEpD,SAASC,EAAmBC,EAAeC,GACzC,MAAMC,EAAU,GACVC,EAAS,CAAED,QAASA,GACpBE,EAAa,GACbC,EAAU,GAChB,IAAIC,EAAS,EACb,IAAK,IAAIC,EAAI,EAAGA,EAAIP,EAAcQ,OAAQD,IAAK,CAC7C,MAAME,EAAKT,EAAcO,GACnBG,EAAQL,EAAQG,OACtB,GAAW,YAAPC,EACFL,EAAWG,GAAKZ,EAChBW,SAEG,GAAW,WAAPG,EACPL,EAAWG,GAAKJ,EAChBG,SAEG,GAAW,YAAPG,EACPL,EAAWG,GAAKL,EAChBI,QAEG,CAEH,MAAMK,EAAMJ,EACZF,EAAQO,KAAK,SAAUC,GACrBT,EAAWO,GAAOE,EAAGC,UAGrBR,IACFN,EAAcU,GAASD,GAEvBH,IACFN,EAAcQ,QAAUF,GAC1B,MAAMS,EAAUd,EAChB,MAAO,CAACD,EAAe,SAAUgB,GAE/B,OADAA,EAAQ,UAAWd,GACZ,CACLG,QAASA,EACTY,QAAS,WACPd,EAAOD,QAAUa,EAAQG,MAAMhB,EAASE,IAAeD,EAAOD,QAC1DA,IAAYC,EAAOD,SACrBc,EAAQ,UAAWb,EAAOD,aAOpC,IAAIiB,EACJ,MAAMC,EAAiB9B,EAAgB+B,SAET,IAA1BD,EAAeZ,OACjBlB,EAAgB+B,SAAW,SAAUC,EAAMC,EAAMC,GAC3B,iBAATF,IACTH,EAAsBI,GACxBH,EAAeF,MAAMO,KAAMC,YAI7BpC,EAAgB+B,SAAW,SAAUE,EAAMC,GACzCL,EAAsBK,EACtBJ,EAAeF,MAAMO,KAAMC,YAI/B,MAAMC,EAAcrC,EAAgBqC,YAgBpC,IAAI3B,EAAeC,EAfnBX,EAAgBqC,YAAc,WAC5B,MAAMN,EAAWM,EAAYC,KAAKH,MAElC,GAAIJ,GAAYA,EAAS,KAAOF,EAC9B,OAAOE,EAIT,IAAKrB,EACH,OAAOqB,GAAY3B,EAErB,MAAMmC,EAAe9B,EAAkBC,EAAeC,GAEtD,OADAD,EAAgB,KACT6B,GAGTxC,EAAOyC,OAAS,SAAUR,EAAMC,EAAMN,GAEpC,GAAoB,iBAATK,EAAmB,CAC5B,GAAItB,EAAe,CACjB,IAAKT,OAAOwC,iBACV,MAAM,IAAInC,MAAM,uEAIlB,OAHAL,OAAOwC,iBAAiBT,GAAQvB,EAAkBwB,EAAMN,GACxDjB,EAAgB,QAChBC,EAAgBJ,GAIZN,OAAOwC,mBACTxC,OAAOwC,iBAAiBT,GAAQvB,EAAkBwB,EAAMN,IAC1DK,EAAOC,EACPA,EAAON,EAIPK,aAAgBU,OAClBhC,EAAgBsB,EAChBrB,EAAgBsB,GAGO,iBAATD,GACdtB,EAAgB,GAChBC,EAAgB,WAAc,OAAOqB,IAGd,mBAATA,IACdtB,EAAgBF,EAChBG,EAAgBqB,IAGpBjC,EAAOyC,OAAOG,IAAM,GAjItB,CAkImB,oBAATC,KAAuBA,KAAO7C"}
\ No newline at end of file
+{"version":3,"sources":["amd.js"],"names":["global","systemPrototype","System","constructor","prototype","emptyInstantiation","unsupportedRequire","Error","emptyFn","requireExportsModule","createAMDRegister","amdDefineDeps","amdDefineExec","exports","module","depModules","setters","splice","i","length","id","index","idx","push","ns","default","amdExec","_export","execute","apply","lastRegisterDeclare","systemRegister","register","name","deps","declare","this","arguments","getRegister","call","registration","define","registerRegistry","Array","amd","self"],"mappings":"CAGA,SAAWA,GACT,MAAMC,EAAkBC,OAAOC,YAAYC,UAErCC,EAAqB,CAAC,GAAI,WAAc,MAAO,KAErD,SAASC,IACP,MAAM,IAAIC,MAAM,8BAGlB,SAASC,KAET,MAAMC,EAAuB,CAAC,UAAW,UAAW,UAEpD,SAASC,EAAmBC,EAAeC,GACzC,MAAMC,EAAU,GACVC,EAAS,CAAED,QAASA,GACpBE,EAAa,GACbC,EAAU,GAChB,IAAIC,EAAS,EACb,IAAK,IAAIC,EAAI,EAAGA,EAAIP,EAAcQ,OAAQD,IAAK,CAC7C,MAAME,EAAKT,EAAcO,GACnBG,EAAQL,EAAQG,OACtB,GAAW,YAAPC,EACFL,EAAWG,GAAKZ,EAChBW,SAEG,GAAW,WAAPG,EACPL,EAAWG,GAAKJ,EAChBG,SAEG,GAAW,YAAPG,EACPL,EAAWG,GAAKL,EAChBI,QAEG,CAEH,MAAMK,EAAMJ,EACZF,EAAQO,KAAK,SAAUC,GACrBT,EAAWO,GAAOE,EAAGC,UAGrBR,IACFN,EAAcU,GAASD,GAEvBH,IACFN,EAAcQ,QAAUF,GAC1B,MAAMS,EAAUd,EAChB,MAAO,CAACD,EAAe,SAAUgB,GAE/B,OADAA,EAAQ,UAAWd,GACZ,CACLG,QAASA,EACTY,QAAS,WACPd,EAAOD,QAAUa,EAAQG,MAAMhB,EAASE,IAAeD,EAAOD,QAC1DA,IAAYC,EAAOD,SACrBc,EAAQ,UAAWb,EAAOD,aAOpC,IAAIiB,EACJ,MAAMC,EAAiB9B,EAAgB+B,SAET,IAA1BD,EAAeZ,OACjBlB,EAAgB+B,SAAW,SAAUC,EAAMC,EAAMC,GAC3B,iBAATF,IACTH,EAAsBI,GACxBH,EAAeF,MAAMO,KAAMC,YAI7BpC,EAAgB+B,SAAW,SAAUE,EAAMC,GACzCL,EAAsBK,EACtBJ,EAAeF,MAAMO,KAAMC,YAI/B,MAAMC,EAAcrC,EAAgBqC,YAgBpC,IAAI3B,EAAeC,EAfnBX,EAAgBqC,YAAc,WAC5B,MAAMN,EAAWM,EAAYC,KAAKH,MAElC,GAAIJ,GAAYA,EAAS,KAAOF,EAC9B,OAAOE,EAIT,IAAKrB,EACH,OAAOqB,GAAY3B,EAErB,MAAMmC,EAAe9B,EAAkBC,EAAeC,GAEtD,OADAD,EAAgB,KACT6B,GAGTxC,EAAOyC,OAAS,SAAUR,EAAMC,EAAMN,GAEpC,GAAoB,iBAATK,EAAmB,CAC5B,GAAItB,EAAe,CACjB,IAAKT,OAAOwC,iBACV,MAAM,IAAInC,MAAM,wEAIlB,OAHAL,OAAOwC,iBAAiBT,GAAQvB,EAAkBwB,EAAMN,GACxDjB,EAAgB,QAChBC,EAAgBJ,GAIZN,OAAOwC,mBACTxC,OAAOwC,iBAAiBT,GAAQvB,EAAkBwB,EAAMN,IAC1DK,EAAOC,EACPA,EAAON,EAIPK,aAAgBU,OAClBhC,EAAgBsB,EAChBrB,EAAgBsB,GAGO,iBAATD,GACdtB,EAAgB,GAChBC,EAAgB,WAAc,OAAOqB,IAGd,mBAATA,IACdtB,EAAgBF,EAChBG,EAAgBqB,IAGpBjC,EAAOyC,OAAOG,IAAM,GAjItB,CAkImB,oBAATC,KAAuBA,KAAO7C"}
\ No newline at end of file
diff --git a/dist/s.js b/dist/s.js
index 50f94d68..4e70a03d 100644
--- a/dist/s.js
+++ b/dist/s.js
@@ -1,5 +1,5 @@
 /*
-* SJS 3.1.2
+* SJS 3.1.3
 * Minimal SystemJS Build
 */
 (function () {
@@ -395,6 +395,24 @@
     });
   };
 
+  /*
+   * Supports loading System.register in workers
+   */
+
+  if (hasSelf && typeof importScripts === 'function')
+    systemJSPrototype.instantiate = function (url) {
+      const loader = this;
+      return new Promise(function (resolve, reject) {
+        try {
+          importScripts(url);
+        }
+        catch (e) {
+          reject(e);
+        }
+        resolve(loader.getRegister());
+      });
+    };
+
   systemJSPrototype.resolve = function (id, parentUrl) {
     const resolved = resolveIfNotPlainOrUrl(id, parentUrl || baseUrl);
     if (!resolved) {
diff --git a/dist/s.min.js b/dist/s.min.js
index 5a741ab8..fbb162ac 100644
--- a/dist/s.min.js
+++ b/dist/s.min.js
@@ -1 +1 @@
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diff --git a/dist/system.js b/dist/system.js
index 57ef6906..6382ea83 100644
--- a/dist/system.js
+++ b/dist/system.js
@@ -1,5 +1,5 @@
 /*
-* SystemJS 3.1.2
+* SystemJS 3.1.3
 */
 (function () {
   const hasSelf = typeof self !== 'undefined';
@@ -775,7 +775,7 @@
     const loader = this, keys = Object.keys(loader[REGISTRY]);
     let index = 0, ns, key;
     return {
-      next () {
+      next: function () {
         while (
           (key = keys[index++]) !== undefined && 
           (ns = loader.get(key)) === undefined
diff --git a/dist/system.min.js b/dist/system.min.js
index 8ef0fd3f..aeec100b 100644
--- a/dist/system.min.js
+++ b/dist/system.min.js
@@ -1,4 +1,4 @@
 /*
-* SystemJS 3.1.2
+* SystemJS 3.1.3
 */
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diff --git a/dist/system.min.js.map b/dist/system.min.js.map
index fad58c92..7b282999 100644
--- a/dist/system.min.js.map
+++ b/dist/system.min.js.map
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\ No newline at end of file
diff --git a/package.json b/package.json
index ae7d8bc5..8d47853d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "systemjs",
-  "version": "3.1.2",
+  "version": "3.1.3",
   "description": "Dynamic ES module loader",
   "repository": {
     "type": "git",