diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e58876..7f9e90d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ### Changelog
 
+#### 5.2.3
+
+Bumps iro-core version to fix server-side environment issues noted in https://github.com/jaames/iro.js/issues/131
+
 #### 5.2.2
 
 Fixes https://github.com/jaames/iro.js/issues/129
diff --git a/dist/index.d.ts b/dist/index.d.ts
index e84de7c..1e7c237 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -7,7 +7,7 @@ import { IroBox } from './Box';
 import { IroWheel } from './Wheel';
 import { IroColorPicker } from './ColorPicker';
 declare namespace iro {
-    const version = "5.2.2";
+    const version = "5.2.3";
     type Color = IroColor;
     const Color: typeof IroColor;
     type ColorPicker = IroColorPicker;
diff --git a/dist/iro.es.js b/dist/iro.es.js
index 5b5f9f5..0bf41e5 100644
--- a/dist/iro.es.js
+++ b/dist/iro.es.js
@@ -1,5 +1,5 @@
 /*!
- * iro.js v5.2.2
+ * iro.js v5.2.3
  * 2016-2020 James Daniel
  * Licensed under MPL 2.0
  * github.com/jaames/iro.js
@@ -1026,7 +1026,7 @@ function getBoxGradients(props, color) {
 // Keep track of html <base> elements for resolveSvgUrl
 // getElementsByTagName returns a live HTMLCollection, which stays in sync with the DOM tree
 // So it only needs to be called once
-var BASE_ELEMENTS = document.getElementsByTagName('base');
+var BASE_ELEMENTS;
 /**
  * @desc Resolve an SVG reference URL
  * This is required to work around how Safari and iOS webviews handle gradient URLS under certain conditions
@@ -1041,7 +1041,8 @@ var BASE_ELEMENTS = document.getElementsByTagName('base');
  */
 
 function resolveSvgUrl(url) {
-  // Sniff useragent string to check if the user is running Safari
+  if (!BASE_ELEMENTS) { BASE_ELEMENTS = document.getElementsByTagName('base'); } // Sniff useragent string to check if the user is running Safari
+
   var ua = window.navigator.userAgent;
   var isSafari = /^((?!chrome|android).)*safari/i.test(ua);
   var isIos = /iPhone|iPod|iPad/i.test(ua);
@@ -1654,7 +1655,7 @@ var IroColorPickerWidget = createWidget(IroColorPicker);
 
 var iro;
 (function (iro) {
-    iro.version = "5.2.2"; // replaced by @rollup/plugin-replace; see rollup.config.js
+    iro.version = "5.2.3"; // replaced by @rollup/plugin-replace; see rollup.config.js
     iro.Color = IroColor;
     iro.ColorPicker = IroColorPickerWidget;
     var ui;
diff --git a/dist/iro.js b/dist/iro.js
index 81efbc2..936aa75 100644
--- a/dist/iro.js
+++ b/dist/iro.js
@@ -1,5 +1,5 @@
 /*!
- * iro.js v5.2.2
+ * iro.js v5.2.3
  * 2016-2020 James Daniel
  * Licensed under MPL 2.0
  * github.com/jaames/iro.js
@@ -1032,7 +1032,7 @@
   // Keep track of html <base> elements for resolveSvgUrl
   // getElementsByTagName returns a live HTMLCollection, which stays in sync with the DOM tree
   // So it only needs to be called once
-  var BASE_ELEMENTS = document.getElementsByTagName('base');
+  var BASE_ELEMENTS;
   /**
    * @desc Resolve an SVG reference URL
    * This is required to work around how Safari and iOS webviews handle gradient URLS under certain conditions
@@ -1047,7 +1047,8 @@
    */
 
   function resolveSvgUrl(url) {
-    // Sniff useragent string to check if the user is running Safari
+    if (!BASE_ELEMENTS) { BASE_ELEMENTS = document.getElementsByTagName('base'); } // Sniff useragent string to check if the user is running Safari
+
     var ua = window.navigator.userAgent;
     var isSafari = /^((?!chrome|android).)*safari/i.test(ua);
     var isIos = /iPhone|iPod|iPad/i.test(ua);
@@ -1660,7 +1661,7 @@
 
   var iro;
   (function (iro) {
-      iro.version = "5.2.2"; // replaced by @rollup/plugin-replace; see rollup.config.js
+      iro.version = "5.2.3"; // replaced by @rollup/plugin-replace; see rollup.config.js
       iro.Color = IroColor;
       iro.ColorPicker = IroColorPickerWidget;
       var ui;
diff --git a/dist/iro.min.js b/dist/iro.min.js
index b53feb9..147da15 100644
--- a/dist/iro.min.js
+++ b/dist/iro.min.js
@@ -1,7 +1,7 @@
 /*!
- * iro.js v5.2.2
+ * iro.js v5.2.3
  * 2016-2020 James Daniel
  * Licensed under MPL 2.0
  * github.com/jaames/iro.js
  */
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d("svg",Object.assign({},t,{className:"IroWheel",width:r,height:r,style:i}),d("defs",null,d("radialGradient",{id:n},d("stop",{offset:"0%","stop-color":"#fff"}),d("stop",{offset:"100%","stop-color":"#fff","stop-opacity":"0"}))),d("g",{className:"IroWheelHue","stroke-width":u,fill:"none"},vn.map(function(n){return d("path",{key:n,d:function(n,t,i,r,e){var u=e-r<=180?0:1;return r*=Math.PI/180,e*=Math.PI/180,"M "+(n+i*Math.cos(e))+" "+(t+i*Math.sin(e))+" A "+i+" "+i+" 0 "+u+" 0 "+(n+i*Math.cos(r))+" "+(t+i*Math.sin(r))}(o,l,u/2,n,n+1.5),stroke:"hsl("+nn(e,n)+", 100%, 50%)"})})),d("circle",{className:"IroWheelSaturation",cx:o,cy:l,r:u,fill:"url("+on("#"+n)+")"}),e.wheelLightness&&d("circle",{className:"IroWheelLightness",cx:o,cy:l,r:u,fill:"#000",opacity:1-h.v/100}),d("circle",{className:"IroWheelBorder",cx:o,cy:l,r:u,fill:"none",stroke:e.borderColor,"stroke-width":c}),s.filter(function(n){return n!==a}).map(function(n){return d(fn,{isActive:!1,index:n.index,fill:n.hslString,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:v[n.index].x,y:v[n.index].y})}),d(fn,{isActive:!0,index:a.index,fill:a.hslString,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:v[a.index].x,y:v[a.index].y}))})}var gn=function(i){function n(n){var t=this;i.call(this,n),this.colors=[],this.inputActive=!1,this.events={},this.activeEvents={},this.deferredEvents={},this.id=n.id,(0<n.colors.length?n.colors:[n.color]).forEach(function(n){return t.addColor(n)}),this.setActiveColor(0),this.state=Object.assign({},n,{color:this.color,colors:this.colors,layout:n.layout})}return i&&(n.__proto__=i),((n.prototype=Object.create(i&&i.prototype)).constructor=n).prototype.addColor=function(n,t){void 0===t&&(t=this.colors.length);var i=new Q(n,this.onColorChange.bind(this));this.colors.splice(t,0,i),this.colors.forEach(function(n,t){return 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t=window.navigator.userAgent,i=/^((?!chrome|android).)*safari/i.test(t),r=/iPhone|iPod|iPad/i.test(t),e=window.location;return(i||r)&&0<X.length?e.protocol+"//"+e.host+e.pathname+e.search+n:n}function ln(n,t,i,r){for(var e=0;e<r.length;e++){var u=r[e].x-t,o=r[e].y-i;if(Math.sqrt(u*u+o*o)<n.handleRadius)return e}return null}var sn=["mousemove","touchmove","mouseup","touchend"],cn=function(t){function n(n){t.call(this,n),this.uid=(Math.random()+1).toString(36).substring(5)}return t&&(n.__proto__=t),((n.prototype=Object.create(t&&t.prototype)).constructor=n).prototype.render=function(n){var t=this.handleEvent.bind(this),i={onMouseDown:t,ontouchstart:t},r="horizontal"===n.layoutDirection,e=null===n.margin?n.sliderMargin:n.margin,u={overflow:"visible",display:r?"inline-block":"block"};return 0<n.index&&(u[r?"marginLeft":"marginTop"]=e),d(O,null,n.children(this.uid,i,u))},n.prototype.handleEvent=function(n){var 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b=Q.hsvToHsl({h:i.h,s:i.s,v:100});return[[0,"#000"],[100,"hsl("+b.h+","+b.s+"%,"+b.l+"%)"]]}}(e,u),f="alpha"===e.sliderType;return d(cn,Object.assign({},e,{onInput:function(n,t,i){var r=function(n,t,i){var r,e=Y(n),u=e.handleRange,o=e.handleStart;r="horizontal"===n.layoutDirection?-1*i+u+o:t-o,r=Math.max(Math.min(r,u),0);var l=Math.round(100/u*r);switch(n.sliderType){case"kelvin":var s=n.minTemperature;return s+l/100*(n.maxTemperature-s);case"alpha":return l/100;case"hue":return 3.6*l;case"red":case"blue":case"green":return 2.55*l;default:return l}}(e,n,t);e.parent.inputActive=!0,u[e.sliderType]=r,e.onInput(i)}}),function(n,t,i){return d("svg",Object.assign({},t,{className:"IroSlider",width:r,height:o,style:i}),d("defs",null,d("linearGradient",Object.assign({id:"g"+n},function(n){var t="horizontal"===n.layoutDirection;return{x1:"0%",y1:t?"100%":"0%",x2:t?"0%":"100%",y2:"0%"}}(e)),c.map(function(n){return d("stop",{offset:n[0]+"%","stop-color":n[1]})})),f&&d("pattern",{id:"b"+n,width:"8",height:"8",patternUnits:"userSpaceOnUse"},d("rect",{x:"0",y:"0",width:"8",height:"8",fill:"#fff"}),d("rect",{x:"0",y:"0",width:"4",height:"4",fill:"#ccc"}),d("rect",{x:"4",y:"4",width:"4",height:"4",fill:"#ccc"})),f&&d("pattern",{id:"f"+n,width:"100%",height:"100%"},d("rect",{x:"0",y:"0",width:"100%",height:"100%",fill:"url("+on("#b"+n)+")"}),d("rect",{x:"0",y:"0",width:"100%",height:"100%",fill:"url("+on("#g"+n)+")"}))),d("rect",{className:"IroSliderBg",rx:l,ry:l,x:e.borderWidth/2,y:e.borderWidth/2,width:r-e.borderWidth,height:o-e.borderWidth,"stroke-width":e.borderWidth,stroke:e.borderColor,fill:"url("+on((f?"#f":"#g")+n)+")"}),d(fn,{isActive:!0,index:u.index,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:s.x,y:s.y}))})}function hn(e){var n=en(e),r=n.width,u=n.height,o=n.radius,l=e.colors,s=e.parent,t=e.activeIndex,c=void 0!==t&&t<e.colors.length?e.colors[t]:e.color,f=function(n,t){return[[[0,"#fff"],[100,"hsl("+t.hue+",100%,50%)"]],[[0,"rgba(0,0,0,0)"],[100,"#000"]]]}(0,c),a=l.map(function(n){return function(n,t){var i=en(n),r=i.width,e=i.height,u=i.radius,o=t.hsv,l=u,s=r-2*u,c=e-2*u;return{x:l+o.s/100*s,y:l+(c-o.v/100*c)}}(e,n)});return d(cn,Object.assign({},e,{onInput:function(n,t,i){if(0===i){var r=ln(e,n,t,a);null!==r?s.setActiveColor(r):(s.inputActive=!0,c.hsv=un(e,n,t),e.onInput(i))}else 1===i&&(s.inputActive=!0,c.hsv=un(e,n,t));e.onInput(i)}}),function(n,t,i){return d("svg",Object.assign({},t,{className:"IroBox",width:r,height:u,style:i}),d("defs",null,d("linearGradient",{id:"s"+n,x1:"0%",y1:"0%",x2:"100%",y2:"0%"},f[0].map(function(n){return d("stop",{offset:n[0]+"%","stop-color":n[1]})})),d("linearGradient",{id:"l"+n,x1:"0%",y1:"0%",x2:"0%",y2:"100%"},f[1].map(function(n){return d("stop",{offset:n[0]+"%","stop-color":n[1]})})),d("pattern",{id:"f"+n,width:"100%",height:"100%"},d("rect",{x:"0",y:"0",width:"100%",height:"100%",fill:"url("+on("#s"+n)+")"}),d("rect",{x:"0",y:"0",width:"100%",height:"100%",fill:"url("+on("#l"+n)+")"}))),d("rect",{rx:o,ry:o,x:e.borderWidth/2,y:e.borderWidth/2,width:r-e.borderWidth,height:u-e.borderWidth,"stroke-width":e.borderWidth,stroke:e.borderColor,fill:"url("+on("#f"+n)+")"}),l.filter(function(n){return n!==c}).map(function(n){return d(fn,{isActive:!1,index:n.index,fill:n.hslString,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:a[n.index].x,y:a[n.index].y})}),d(fn,{isActive:!0,index:c.index,fill:c.hslString,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:a[c.index].x,y:a[c.index].y}))})}fn.defaultProps={fill:"none",x:0,y:0,r:8,url:null,props:{x:0,y:0}},an.defaultProps=Object.assign({},{sliderShape:"bar",sliderType:"value",minTemperature:2200,maxTemperature:11e3});var vn=Array.apply(null,{length:360}).map(function(n,t){return t});function dn(e){var n=nn(e),r=n.width,u=n.radius,o=n.cx,l=n.cy,s=e.colors,c=e.borderWidth,f=e.parent,a=e.color,h=a.hsv,v=s.map(function(n){return function(n,t){var i=t.hsv,r=nn(n),e=r.cx,u=r.cy,o=n.width/2-n.padding-n.handleRadius-n.borderWidth,l=(180+tn(n,i.h,!0))*(Math.PI/180),s=i.s/100*o,c="clockwise"===n.wheelDirection?-1:1;return{x:e+s*Math.cos(l)*c,y:u+s*Math.sin(l)*c}}(e,n)});return d(cn,Object.assign({},e,{onInput:function(n,t,i){if(0===i){var r=ln(e,n,t,v);null!==r?f.setActiveColor(r):(f.inputActive=!0,a.hsv=rn(e,n,t),e.onInput(i))}else 1===i&&(f.inputActive=!0,a.hsv=rn(e,n,t));e.onInput(i)}}),function(n,t,i){return d("svg",Object.assign({},t,{className:"IroWheel",width:r,height:r,style:i}),d("defs",null,d("radialGradient",{id:n},d("stop",{offset:"0%","stop-color":"#fff"}),d("stop",{offset:"100%","stop-color":"#fff","stop-opacity":"0"}))),d("g",{className:"IroWheelHue","stroke-width":u,fill:"none"},vn.map(function(n){return d("path",{key:n,d:function(n,t,i,r,e){var u=e-r<=180?0:1;return r*=Math.PI/180,e*=Math.PI/180,"M "+(n+i*Math.cos(e))+" "+(t+i*Math.sin(e))+" A "+i+" "+i+" 0 "+u+" 0 "+(n+i*Math.cos(r))+" "+(t+i*Math.sin(r))}(o,l,u/2,n,n+1.5),stroke:"hsl("+tn(e,n)+", 100%, 50%)"})})),d("circle",{className:"IroWheelSaturation",cx:o,cy:l,r:u,fill:"url("+on("#"+n)+")"}),e.wheelLightness&&d("circle",{className:"IroWheelLightness",cx:o,cy:l,r:u,fill:"#000",opacity:1-h.v/100}),d("circle",{className:"IroWheelBorder",cx:o,cy:l,r:u,fill:"none",stroke:e.borderColor,"stroke-width":c}),s.filter(function(n){return n!==a}).map(function(n){return d(fn,{isActive:!1,index:n.index,fill:n.hslString,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:v[n.index].x,y:v[n.index].y})}),d(fn,{isActive:!0,index:a.index,fill:a.hslString,r:e.handleRadius,url:e.handleSvg,props:e.handleProps,x:v[a.index].x,y:v[a.index].y}))})}var gn=function(i){function n(n){var t=this;i.call(this,n),this.colors=[],this.inputActive=!1,this.events={},this.activeEvents={},this.deferredEvents={},this.id=n.id,(0<n.colors.length?n.colors:[n.color]).forEach(function(n){return t.addColor(n)}),this.setActiveColor(0),this.state=Object.assign({},n,{color:this.color,colors:this.colors,layout:n.layout})}return i&&(n.__proto__=i),((n.prototype=Object.create(i&&i.prototype)).constructor=n).prototype.addColor=function(n,t){void 0===t&&(t=this.colors.length);var i=new Q(n,this.onColorChange.bind(this));this.colors.splice(t,0,i),this.colors.forEach(function(n,t){return n.index=t}),this.state&&this.setState({colors:this.colors}),this.deferredEmit("color:init",i)},n.prototype.removeColor=function(n){var t=this.colors.splice(n,1)[0];t.unbind(),this.colors.forEach(function(n,t){return n.index=t}),this.state&&this.setState({colors:this.colors}),t.index===this.color.index&&this.setActiveColor(0),this.emit("color:remove",t)},n.prototype.setActiveColor=function(n){this.color=this.colors[n],this.state&&this.setState({color:this.color}),this.emit("color:setActive",this.color)},n.prototype.setColors=function(n){var t=this;this.colors.forEach(function(n){return n.unbind()}),this.colors=[],n.forEach(function(n){return t.addColor(n)}),this.setActiveColor(0),this.emit("color:setAll",this.colors)},n.prototype.on=function(n,t){var i=this,r=this.events;(Array.isArray(n)?n:[n]).forEach(function(n){(r[n]||(r[n]=[])).push(t),i.deferredEvents[n]&&(i.deferredEvents[n].forEach(function(n){t.apply(null,n)}),i.deferredEvents[n]=[])})},n.prototype.off=function(n,i){var r=this;(Array.isArray(n)?n:[n]).forEach(function(n){var t=r.events[n];t&&t.splice(t.indexOf(i),1)})},n.prototype.emit=function(n){for(var t=this,i=[],r=arguments.length-1;0<r--;)i[r]=arguments[r+1];var e=this.activeEvents;!!e.hasOwnProperty(n)&&e[n]||(e[n]=!0,(this.events[n]||[]).forEach(function(n){return n.apply(t,i)}),e[n]=!1)},n.prototype.deferredEmit=function(n){for(var t,i=[],r=arguments.length-1;0<r--;)i[r]=arguments[r+1];var e=this.deferredEvents;(t=this).emit.apply(t,[n].concat(i)),(e[n]||(e[n]=[])).push(i)},n.prototype.setOptions=function(n){this.setState(Object.assign({},this.state,n))},n.prototype.resize=function(n){this.setOptions({width:n})},n.prototype.reset=function(){this.colors.forEach(function(n){return n.reset()}),this.setState({colors:this.colors})},n.prototype.onMount=function(n){this.el=n,this.deferredEmit("mount",this)},n.prototype.onColorChange=function(n,t){this.setState({color:this.color}),this.inputActive&&(this.inputActive=!1,this.emit("input:change",n,t)),this.emit("color:change",n,t)},n.prototype.emitInputEvent=function(n){0===n?this.emit("input:start",this.color):1===n?this.emit("input:move",this.color):2===n&&this.emit("input:end",this.color)},n.prototype.render=function(n,e){var u=this,t=e.layout;return Array.isArray(t)||(t=[{component:dn},{component:an}],e.transparency&&t.push({component:an,options:{sliderType:"alpha"}})),d("div",{class:"IroColorPicker",id:e.id,style:{display:e.display}},t.map(function(n,t){var i=n.component,r=n.options;return d(i,Object.assign({},e,r,{ref:void 0,onInput:u.emitInputEvent.bind(u),parent:u,index:t}))}))},n}(I);gn.defaultProps=Object.assign({},{width:300,height:300,handleRadius:8,handleSvg:null,handleProps:{x:0,y:0},color:"#fff",colors:[],borderColor:"#fff",borderWidth:0,wheelLightness:!0,wheelAngle:0,wheelDirection:"anticlockwise",layoutDirection:"vertical",sliderSize:null,sliderMargin:12,padding:6},{colors:[],display:"block",id:null,layout:"default",margin:null});var bn,pn,yn,wn,xn=(mn.prototype=(bn=gn).prototype,Object.assign(mn,bn),mn.A=bn,mn);function mn(t,n){var i,r=document.createElement("div");function e(){var n=t instanceof Element?t:document.querySelector(t);n.appendChild(i.base),i.onMount(n)}return function(n,t,i){var r,e,u;m.i&&m.i(n,t),e=(r=i===o)?null:i&&i.n||t.n,n=d(O,null,[n]),u=[],x(t,r?t.n=n:(i||t).n=n,e||k,k,void 0!==t.ownerSVGElement,i&&!r?[i]:e?null:M.slice.call(t.childNodes),u,!1,i||k,r),v(u,n)}(d(bn,Object.assign({},{ref:function(n){return i=n}},n)),r),"loading"!==document.readyState?e():document.addEventListener("DOMContentLoaded",e),i}return(yn=pn=pn||{}).version="5.2.3",yn.Color=Q,yn.ColorPicker=xn,(wn=yn.ui||(yn.ui={})).h=d,wn.ComponentBase=cn,wn.Handle=fn,wn.Slider=an,wn.Wheel=dn,wn.Box=hn,pn});
diff --git a/docs/.vuepress/theme/js/iro.es.js b/docs/.vuepress/theme/js/iro.es.js
index 5b5f9f5..0bf41e5 100644
--- a/docs/.vuepress/theme/js/iro.es.js
+++ b/docs/.vuepress/theme/js/iro.es.js
@@ -1,5 +1,5 @@
 /*!
- * iro.js v5.2.2
+ * iro.js v5.2.3
  * 2016-2020 James Daniel
  * Licensed under MPL 2.0
  * github.com/jaames/iro.js
@@ -1026,7 +1026,7 @@ function getBoxGradients(props, color) {
 // Keep track of html <base> elements for resolveSvgUrl
 // getElementsByTagName returns a live HTMLCollection, which stays in sync with the DOM tree
 // So it only needs to be called once
-var BASE_ELEMENTS = document.getElementsByTagName('base');
+var BASE_ELEMENTS;
 /**
  * @desc Resolve an SVG reference URL
  * This is required to work around how Safari and iOS webviews handle gradient URLS under certain conditions
@@ -1041,7 +1041,8 @@ var BASE_ELEMENTS = document.getElementsByTagName('base');
  */
 
 function resolveSvgUrl(url) {
-  // Sniff useragent string to check if the user is running Safari
+  if (!BASE_ELEMENTS) { BASE_ELEMENTS = document.getElementsByTagName('base'); } // Sniff useragent string to check if the user is running Safari
+
   var ua = window.navigator.userAgent;
   var isSafari = /^((?!chrome|android).)*safari/i.test(ua);
   var isIos = /iPhone|iPod|iPad/i.test(ua);
@@ -1654,7 +1655,7 @@ var IroColorPickerWidget = createWidget(IroColorPicker);
 
 var iro;
 (function (iro) {
-    iro.version = "5.2.2"; // replaced by @rollup/plugin-replace; see rollup.config.js
+    iro.version = "5.2.3"; // replaced by @rollup/plugin-replace; see rollup.config.js
     iro.Color = IroColor;
     iro.ColorPicker = IroColorPickerWidget;
     var ui;
diff --git a/package.json b/package.json
index 25c3de8..c97a9e5 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,12 @@
 {
   "name": "@jaames/iro",
-  "version": "5.2.2",
+  "version": "5.2.3",
   "description": "A moden, SVG-based color picker widget for JavaScript",
   "module": "dist/iro.es.js",
   "main": "dist/iro.js",
   "types": "dist/index.d.ts",
   "dependencies": {
-    "@irojs/iro-core": "^1.0.2",
+    "@irojs/iro-core": "^1.0.3",
     "preact": "^10.0.0"
   },
   "devDependencies": {