diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0679cce8..b9bcadf3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
-## 5.0.1 (Latest Release)
+## 5.1.0 (Latest Release)
+
+- Adds `scrollable` option, which enables the scrollable modal content added in Bootstrap 4.3
+- Adds `extra-large` as a size option
+- Adds aliased/alternative keys for all size options: `sm`, `lg`, `xl`
+
+### 5.0.1
 
 - Adds Tamil locale
 
diff --git a/README.md b/README.md
index e52d8b3a..167b7090 100644
--- a/README.md
+++ b/README.md
@@ -35,10 +35,22 @@ Bootbox **3.3.0** is the *last* release to support Bootstrap 2.2.x.
 
 Much more dependency information can be found [on the Bootbox website](http://bootboxjs.com/getting-started.html#bootbox-dependencies).
 
-### Latest Release: 5.0.0
+### 5.1.0 (Latest Release)
+
+- Adds `scrollable` option, which enables the scrollable modal content added in Bootstrap 4.3
+- Adds `extra-large` as a size option
+- Adds aliased/alternative keys for all size options: `sm`, `lg`, `xl`
+
+#### 5.0.1
+
+- Adds Tamil locale
+
+#### 5.0.0
 
 - Updates Bootbox to be compatible with both Bootstrap 4 and Bootstrap 3.
 - Pulls button locale options to separate file
+- Corrects Russion locale
+- Changes default button trigger to target the button with the `bootbox-accept` class; this corrects instances where no button has the `btn-primary` class.
 - Various bugfixes
 
 #### Prompt
diff --git a/dist/bootbox.all.min.js b/dist/bootbox.all.min.js
index da7cfe83..861fb69e 100644
--- a/dist/bootbox.all.min.js
+++ b/dist/bootbox.all.min.js
@@ -1,6 +1,6 @@
 /**
- * bootbox.js 5.0.1
+ * bootbox.js 5.1.0
  *
  * http://bootboxjs.com/license.txt
  */
-!function(e,t){'use strict';'function'==typeof define&&define.amd?define(['jquery'],t):'object'==typeof exports?module.exports=t(require('jquery')):e.bootbox=t(e.jQuery)}(this,function t(u,p){'use strict';var r,n,l,i;Object.keys||(Object.keys=(r=Object.prototype.hasOwnProperty,n=!{toString:null}.propertyIsEnumerable('toString'),i=(l=['toString','toLocaleString','valueOf','hasOwnProperty','isPrototypeOf','propertyIsEnumerable','constructor']).length,function(e){if('function'!=typeof e&&('object'!=typeof e||null===e))throw new TypeError('Object.keys called on non-object');var t,o,a=[];for(t in e)r.call(e,t)&&a.push(t);if(n)for(o=0;o<i;o++)r.call(e,l[o])&&a.push(l[o]);return a}));var d={};d.VERSION='5.0.0';var b={},f={dialog:"<div class=\"bootbox modal\" tabindex=\"-1\" role=\"dialog\" aria-hidden=\"true\"><div class=\"modal-dialog\"><div class=\"modal-content\"><div class=\"modal-body\"><div class=\"bootbox-body\"></div></div></div></div></div>",header:"<div class=\"modal-header\"><h5 class=\"modal-title\"></h5></div>",footer:'<div class="modal-footer"></div>',closeButton:'<button type="button" class="bootbox-close-button close" aria-hidden="true">&times;</button>',form:'<form class="bootbox-form"></form>',button:'<button type="button" class="btn"></button>',option:'<option></option>',promptMessage:'<div class="bootbox-prompt-message"></div>',inputs:{text:'<input class="bootbox-input bootbox-input-text form-control" autocomplete="off" type="text" />',textarea:'<textarea class="bootbox-input bootbox-input-textarea form-control"></textarea>',email:'<input class="bootbox-input bootbox-input-email form-control" autocomplete="off" type="email" />',select:'<select class="bootbox-input bootbox-input-select form-control"></select>',checkbox:'<div class="form-check checkbox"><label class="form-check-label"><input class="form-check-input bootbox-input bootbox-input-checkbox" type="checkbox" /></label></div>',radio:'<div class="form-check radio"><label class="form-check-label"><input class="form-check-input bootbox-input bootbox-input-radio" type="radio" name="bootbox-radio" /></label></div>',date:'<input class="bootbox-input bootbox-input-date form-control" autocomplete="off" type="date" />',time:'<input class="bootbox-input bootbox-input-time form-control" autocomplete="off" type="time" />',number:'<input class="bootbox-input bootbox-input-number form-control" autocomplete="off" type="number" />',password:'<input class="bootbox-input bootbox-input-password form-control" autocomplete="off" type="password" />',range:'<input class="bootbox-input bootbox-input-range form-control-range" autocomplete="off" type="range" />'}},m={locale:'en',backdrop:'static',animate:!0,className:null,closeButton:!0,show:!0,container:'body',value:'',inputType:'text',swapButtonOrder:!1,centerVertical:!1,multiple:!1};function c(e,t,o){return u.extend(!0,{},e,function(e,t){var o=e.length,a={};if(o<1||2<o)throw new Error('Invalid argument length');return 2===o||'string'==typeof e[0]?(a[t[0]]=e[0],a[t[1]]=e[1]):a=e[0],a}(t,o))}function h(e,t,o,a){var r;a&&a[0]&&(r=a[0].locale||m.locale,(a[0].swapButtonOrder||m.swapButtonOrder)&&(t=t.reverse()));var n,l,i,s={className:'bootbox-'+e,buttons:function(e,t){for(var o={},a=0,r=e.length;a<r;a++){var n=e[a],l=n.toLowerCase(),i=n.toUpperCase();o[l]={label:(s=i,c=t,void 0,u=b[c],u?u[s]:b.en[s])}}var s,c,u;return o}(t,r)};return n=c(s,a,o),i={},O(l=t,function(e,t){i[t]=!0}),O(n.buttons,function(e){if(i[e]===p)throw new Error('button key "'+e+'" is not allowed (options are '+l.join(' ')+')')}),n}function C(e){return Object.keys(e).length}function O(e,o){var a=0;u.each(e,function(e,t){o(e,t,a++)})}function v(e,t,o){e.stopPropagation(),e.preventDefault(),u.isFunction(o)&&!1===o.call(t,e)||t.modal('hide')}function w(e){return/([01][0-9]|2[0-3]):[0-5][0-9]?:[0-5][0-9]/.test(e)}function g(e){return/(\d{4})-(\d{2})-(\d{2})/.test(e)}return d.locales=function(e){return e?b[e]:b},d.addLocale=function(e,o){return u.each(['OK','CANCEL','CONFIRM'],function(e,t){if(!o[t])throw new Error('Please supply a translation for "'+t+'"')}),b[e]={OK:o.OK,CANCEL:o.CANCEL,CONFIRM:o.CONFIRM},d},d.removeLocale=function(e){if('en'===e)throw new Error('"en" is used as the default and fallback locale and cannot be removed.');return delete b[e],d},d.setLocale=function(e){return d.setDefaults('locale',e)},d.setDefaults=function(){var e={};return 2===arguments.length?e[arguments[0]]=arguments[1]:e=arguments[0],u.extend(m,e),d},d.hideAll=function(){return u('.bootbox').modal('hide'),d},d.init=function(e){return t(e||u)},d.dialog=function(e){if(u.fn.modal===p)throw new Error("\"$.fn.modal\" is not defined; please double check you have included the Bootstrap JavaScript library. 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Please upgrade, if possible.');var o=u(f.dialog),a=o.find('.modal-dialog'),r=o.find('.modal-body'),n=u(f.header),l=u(f.footer),i=e.buttons,s={onEscape:e.onEscape};if(r.find('.bootbox-body').html(e.message),0<C(e.buttons)&&(O(i,function(e,t){var o=u(f.button);switch(o.data('bb-handler',e),o.addClass(t.className),e){case'ok':case'confirm':o.addClass('bootbox-accept');break;case'cancel':o.addClass('bootbox-cancel')}o.html(t.label),l.append(o),s[e]=t.callback}),r.after(l)),!0===e.animate&&o.addClass('fade'),e.className&&o.addClass(e.className),e.size)switch(e.fullBootstrapVersion.substring(0,3)<'3.1'&&console.warn('"size" requires Bootstrap 3.1.0 or higher. You appear to be using '+e.fullBootstrapVersion+'. 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Please upgrade to use this option.'),a.addClass('modal-dialog-scrollable')),e.title&&(r.before(n),o.find('.modal-title').html(e.title)),e.closeButton){var c=u(f.closeButton);e.title?3<e.bootstrap?o.find('.modal-header').append(c):o.find('.modal-header').prepend(c):c.prependTo(r)}return e.centerVertical&&(e.fullBootstrapVersion<'4.0.0'&&console.warn('"centerVertical" requires Bootstrap 4.0.0-beta.3 or higher. You appear to be using '+e.fullBootstrapVersion+'. Please upgrade to use this option.'),a.addClass('modal-dialog-centered')),o.one('hide.bs.modal',function(e){e.target===this&&(o.off('escape.close.bb'),o.off('click'))}),o.one('hidden.bs.modal',function(e){e.target===this&&o.remove()}),o.one('shown.bs.modal',function(){o.find('.bootbox-accept:first').trigger('focus')}),'static'!==e.backdrop&&o.on('click.dismiss.bs.modal',function(e){o.children('.modal-backdrop').length&&(e.currentTarget=o.children('.modal-backdrop').get(0)),e.target===e.currentTarget&&o.trigger('escape.close.bb')}),o.on('escape.close.bb',function(e){s.onEscape&&v(e,o,s.onEscape)}),o.on('click','.modal-footer button:not(.disabled)',function(e){var t=u(this).data('bb-handler');v(e,o,s[t])}),o.on('click','.bootbox-close-button',function(e){v(e,o,s.onEscape)}),o.on('keyup',function(e){27===e.which&&o.trigger('escape.close.bb')}),u(e.container).append(o),o.modal({backdrop:!!e.backdrop&&'static',keyboard:!1,show:!1}),e.show&&o.modal('show'),o},d.alert=function(){var e;if((e=h('alert',['ok'],['message','callback'],arguments)).callback&&!u.isFunction(e.callback))throw new Error('alert requires the "callback" property to be a function when provided');return e.buttons.ok.callback=e.onEscape=function(){return!u.isFunction(e.callback)||e.callback.call(this)},d.dialog(e)},d.confirm=function(){var e;if(e=h('confirm',['cancel','confirm'],['message','callback'],arguments),!u.isFunction(e.callback))throw new Error('confirm requires a callback');return e.buttons.cancel.callback=e.onEscape=function(){return e.callback.call(this,!1)},e.buttons.confirm.callback=function(){return e.callback.call(this,!0)},d.dialog(e)},d.prompt=function(){var r,t,e,n,o,a;if(e=u(f.form),(r=h('prompt',['cancel','confirm'],['title','callback'],arguments)).value||(r.value=m.value),r.inputType||(r.inputType=m.inputType),o=r.show===p?m.show:r.show,r.show=!1,r.buttons.cancel.callback=r.onEscape=function(){return r.callback.call(this,null)},r.buttons.confirm.callback=function(){var e;if('checkbox'===r.inputType)e=n.find('input:checked').map(function(){return u(this).val()}).get();else if('radio'===r.inputType)e=n.find('input:checked').val();else{if(n[0].checkValidity&&!n[0].checkValidity())return!1;e='select'===r.inputType&&!0===r.multiple?n.find('option:selected').map(function(){return u(this).val()}).get():n.val()}return r.callback.call(this,e)},!r.title)throw new Error('prompt requires a title');if(!u.isFunction(r.callback))throw new Error('prompt requires a callback');if(!f.inputs[r.inputType])throw new Error('Invalid prompt type');switch(n=u(f.inputs[r.inputType]),r.inputType){case'text':case'textarea':case'email':case'password':n.val(r.value),r.placeholder&&n.attr('placeholder',r.placeholder),r.pattern&&n.attr('pattern',r.pattern),r.maxlength&&n.attr('maxlength',r.maxlength),r.required&&n.prop({required:!0});break;case'date':case'time':case'number':case'range':if(n.val(r.value),r.placeholder&&n.attr('placeholder',r.placeholder),r.pattern&&n.attr('pattern',r.pattern),r.required&&n.prop({required:!0}),'date'!==r.inputType&&r.step){if(!('any'===r.step||!isNaN(r.step)&&0<parseInt(r.step)))throw new Error('"step" must be a valid positive number or the value "any". See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-step for more information.');n.attr('step',r.step)}(function(e,t,o){var a=!1,r=!0,n=!0;if('date'===e)t===p||(r=g(t))?o===p||(n=g(o))||console.warn('Browsers which natively support the "date" input type expect date values to be of the form "YYYY-MM-DD" (see ISO-8601 https://www.iso.org/iso-8601-date-and-time-format.html). Bootbox does not enforce this rule, but your max value may not be enforced by this browser.'):console.warn('Browsers which natively support the "date" input type expect date values to be of the form "YYYY-MM-DD" (see ISO-8601 https://www.iso.org/iso-8601-date-and-time-format.html). Bootbox does not enforce this rule, but your min value may not be enforced by this browser.');else if('time'===e){if(t!==p&&!(r=w(t)))throw new Error('"min" is not a valid time. 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o=u(f.inputs[r.inputType]);o.find('input').attr('value',t.value),o.find('label').append('\n'+t.text),r.value!==p&&t.value===r.value&&(o.find('input').prop('checked',!0),s=!1),n.append(o)}),s&&n.find('input[type="radio"]').first().prop('checked',!0)}if(e.append(n),e.on('submit',function(e){e.preventDefault(),e.stopPropagation(),t.find('.bootbox-accept').trigger('click')}),''!==u.trim(r.message)){var c=u(f.promptMessage).html(r.message);e.prepend(c),r.message=e}else r.message=e;return(t=d.dialog(r)).off('shown.bs.modal'),t.on('shown.bs.modal',function(){n.focus()}),!0===o&&t.modal('show'),t},d.addLocale('en',{OK:'OK',CANCEL:'Cancel',CONFIRM:'OK'}),d}),function(e,t){'use strict';'function'==typeof define&&define.amd?define(['bootbox'],t):'object'==typeof module&&module.exports?t(require('./bootbox')):t(e.bootbox)}(this,function(e){'use strict';e.addLocale('ar',{OK:'موافق',CANCEL:'الغاء',CONFIRM:'تأكيد'}),e.addLocale('az',{OK:'OK',CANCEL:'İmtina et',CONFIRM:'Təsdiq et'}),e.addLocale('bg_BG',{OK:'Ок',CANCEL:'Отказ',CONFIRM:'Потвърждавам'}),e.addLocale('br',{OK:'OK',CANCEL:'Cancelar',CONFIRM:'Sim'}),e.addLocale('cs',{OK:'OK',CANCEL:'Zrušit',CONFIRM:'Potvrdit'}),e.addLocale('da',{OK:'OK',CANCEL:'Annuller',CONFIRM:'Accepter'}),e.addLocale('de',{OK:'OK',CANCEL:'Abbrechen',CONFIRM:'Akzeptieren'}),e.addLocale('el',{OK:'Εντάξει',CANCEL:'Ακύρωση',CONFIRM:'Επιβεβαίωση'}),e.addLocale('en',{OK:'OK',CANCEL:'Cancel',CONFIRM:'OK'}),e.addLocale('es',{OK:'OK',CANCEL:'Cancelar',CONFIRM:'Aceptar'}),e.addLocale('eu',{OK:'OK',CANCEL:'Ezeztatu',CONFIRM:'Onartu'}),e.addLocale('et',{OK:'OK',CANCEL:'Katkesta',CONFIRM:'OK'}),e.addLocale('fa',{OK:'قبول',CANCEL:'لغو',CONFIRM:'تایید'}),e.addLocale('fi',{OK:'OK',CANCEL:'Peruuta',CONFIRM:'OK'}),e.addLocale('fr',{OK:'OK',CANCEL:'Annuler',CONFIRM:'Confirmer'}),e.addLocale('he',{OK:'אישור',CANCEL:'ביטול',CONFIRM:'אישור'}),e.addLocale('hu',{OK:'OK',CANCEL:'Mégsem',CONFIRM:'Megerősít'}),e.addLocale('hr',{OK:'OK',CANCEL:'Odustani',CONFIRM:'Potvrdi'}),e.addLocale('id',{OK:'OK',CANCEL:'Batal',CONFIRM:'OK'}),e.addLocale('it',{OK:'OK',CANCEL:'Annulla',CONFIRM:'Conferma'}),e.addLocale('ja',{OK:'OK',CANCEL:'キャンセル',CONFIRM:'確認'}),e.addLocale('ko',{OK:'OK',CANCEL:'취소',CONFIRM:'확인'}),e.addLocale('lt',{OK:'Gerai',CANCEL:'Atšaukti',CONFIRM:'Patvirtinti'}),e.addLocale('lv',{OK:'Labi',CANCEL:'Atcelt',CONFIRM:'Apstiprināt'}),e.addLocale('nl',{OK:'OK',CANCEL:'Annuleren',CONFIRM:'Accepteren'}),e.addLocale('no',{OK:'OK',CANCEL:'Avbryt',CONFIRM:'OK'}),e.addLocale('pl',{OK:'OK',CANCEL:'Anuluj',CONFIRM:'Potwierdź'}),e.addLocale('pt',{OK:'OK',CANCEL:'Cancelar',CONFIRM:'Confirmar'}),e.addLocale('ru',{OK:'OK',CANCEL:'Отмена',CONFIRM:'Подтвердить'}),e.addLocale('sk',{OK:'OK',CANCEL:'Zrušiť',CONFIRM:'Potvrdiť'}),e.addLocale('sl',{OK:'OK',CANCEL:'Prekliči',CONFIRM:'Potrdi'}),e.addLocale('sq',{OK:'OK',CANCEL:'Anulo',CONFIRM:'Prano'}),e.addLocale('sv',{OK:'OK',CANCEL:'Avbryt',CONFIRM:'OK'}),e.addLocale('ta',{OK:'சரி',CANCEL:'ரத்து 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\ No newline at end of file
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செய்',CONFIRM:'உறுதி செய்'}),e.addLocale('th',{OK:'ตกลง',CANCEL:'ยกเลิก',CONFIRM:'ยืนยัน'}),e.addLocale('tr',{OK:'Tamam',CANCEL:'İptal',CONFIRM:'Onayla'}),e.addLocale('uk',{OK:'OK',CANCEL:'Відміна',CONFIRM:'Прийняти'}),e.addLocale('zh_CN',{OK:'OK',CANCEL:'取消',CONFIRM:'确认'}),e.addLocale('zh_TW',{OK:'OK',CANCEL:'取消',CONFIRM:'確認'})});
\ No newline at end of file
diff --git a/dist/bootbox.locales.min.js b/dist/bootbox.locales.min.js
index 612761c5..8ebdbaf2 100644
--- a/dist/bootbox.locales.min.js
+++ b/dist/bootbox.locales.min.js
@@ -1,5 +1,5 @@
 /**
- * bootbox.js 5.0.1
+ * bootbox.js 5.1.0
  *
  * http://bootboxjs.com/license.txt
  */
diff --git a/dist/bootbox.min.js b/dist/bootbox.min.js
index 9355d66f..c2e53ee3 100644
--- a/dist/bootbox.min.js
+++ b/dist/bootbox.min.js
@@ -1,6 +1,6 @@
 /**
- * bootbox.js 5.0.1
+ * bootbox.js 5.1.0
  *
  * http://bootboxjs.com/license.txt
  */
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Please upgrade to use this option.'),e.size){case'small':case'sm':a.addClass('modal-sm');break;case'large':case'lg':a.addClass('modal-lg');break;case'xl':case'extra-large':e.fullBootstrapVersion.substring(0,3)<'4.2'&&console.warn('Using size "xl"/"extra-large" requires Bootstrap 4.2.0 or higher. You appear to be using '+e.fullBootstrapVersion+'. Please upgrade to use this option.'),a.addClass('modal-xl')}if(e.scrollable&&(e.fullBootstrapVersion.substring(0,3)<'4.3'&&console.warn('Using "scrollable" requires Bootstrap 4.3.0 or higher. You appear to be using '+e.fullBootstrapVersion+'. Please upgrade to use this option.'),a.addClass('modal-dialog-scrollable')),e.title&&(r.before(n),o.find('.modal-title').html(e.title)),e.closeButton){var c=p(f.closeButton);e.title?3<e.bootstrap?o.find('.modal-header').append(c):o.find('.modal-header').prepend(c):c.prependTo(r)}return e.centerVertical&&(e.fullBootstrapVersion<'4.0.0'&&console.warn('"centerVertical" requires Bootstrap 4.0.0-beta.3 or higher. You appear to be using '+e.fullBootstrapVersion+'. Please upgrade to use this option.'),a.addClass('modal-dialog-centered')),o.one('hide.bs.modal',function(e){e.target===this&&(o.off('escape.close.bb'),o.off('click'))}),o.one('hidden.bs.modal',function(e){e.target===this&&o.remove()}),o.one('shown.bs.modal',function(){o.find('.bootbox-accept:first').trigger('focus')}),'static'!==e.backdrop&&o.on('click.dismiss.bs.modal',function(e){o.children('.modal-backdrop').length&&(e.currentTarget=o.children('.modal-backdrop').get(0)),e.target===e.currentTarget&&o.trigger('escape.close.bb')}),o.on('escape.close.bb',function(e){s.onEscape&&g(e,o,s.onEscape)}),o.on('click','.modal-footer button:not(.disabled)',function(e){var t=p(this).data('bb-handler');g(e,o,s[t])}),o.on('click','.bootbox-close-button',function(e){g(e,o,s.onEscape)}),o.on('keyup',function(e){27===e.which&&o.trigger('escape.close.bb')}),p(e.container).append(o),o.modal({backdrop:!!e.backdrop&&'static',keyboard:!1,show:!1}),e.show&&o.modal('show'),o},d.alert=function(){var e;if((e=h('alert',['ok'],['message','callback'],arguments)).callback&&!p.isFunction(e.callback))throw new Error('alert requires the "callback" property to be a function when provided');return e.buttons.ok.callback=e.onEscape=function(){return!p.isFunction(e.callback)||e.callback.call(this)},d.dialog(e)},d.confirm=function(){var e;if(e=h('confirm',['cancel','confirm'],['message','callback'],arguments),!p.isFunction(e.callback))throw new Error('confirm requires a callback');return e.buttons.cancel.callback=e.onEscape=function(){return e.callback.call(this,!1)},e.buttons.confirm.callback=function(){return e.callback.call(this,!0)},d.dialog(e)},d.prompt=function(){var r,t,e,n,o,a;if(e=p(f.form),(r=h('prompt',['cancel','confirm'],['title','callback'],arguments)).value||(r.value=m.value),r.inputType||(r.inputType=m.inputType),o=r.show===u?m.show:r.show,r.show=!1,r.buttons.cancel.callback=r.onEscape=function(){return r.callback.call(this,null)},r.buttons.confirm.callback=function(){var e;if('checkbox'===r.inputType)e=n.find('input:checked').map(function(){return p(this).val()}).get();else if('radio'===r.inputType)e=n.find('input:checked').val();else{if(n[0].checkValidity&&!n[0].checkValidity())return!1;e='select'===r.inputType&&!0===r.multiple?n.find('option:selected').map(function(){return p(this).val()}).get():n.val()}return r.callback.call(this,e)},!r.title)throw new Error('prompt requires a title');if(!p.isFunction(r.callback))throw new Error('prompt requires a callback');if(!f.inputs[r.inputType])throw new Error('Invalid prompt type');switch(n=p(f.inputs[r.inputType]),r.inputType){case'text':case'textarea':case'email':case'password':n.val(r.value),r.placeholder&&n.attr('placeholder',r.placeholder),r.pattern&&n.attr('pattern',r.pattern),r.maxlength&&n.attr('maxlength',r.maxlength),r.required&&n.prop({required:!0});break;case'date':case'time':case'number':case'range':if(n.val(r.value),r.placeholder&&n.attr('placeholder',r.placeholder),r.pattern&&n.attr('pattern',r.pattern),r.required&&n.prop({required:!0}),'date'!==r.inputType&&r.step){if(!('any'===r.step||!isNaN(r.step)&&0<parseInt(r.step)))throw new Error('"step" must be a valid positive number or the value "any". See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-step for more information.');n.attr('step',r.step)}(function(e,t,o){var a=!1,r=!0,n=!0;if('date'===e)t===u||(r=x(t))?o===u||(n=x(o))||console.warn('Browsers which natively support the "date" input type expect date values to be of the form "YYYY-MM-DD" (see ISO-8601 https://www.iso.org/iso-8601-date-and-time-format.html). Bootbox does not enforce this rule, but your max value may not be enforced by this browser.'):console.warn('Browsers which natively support the "date" input type expect date values to be of the form "YYYY-MM-DD" (see ISO-8601 https://www.iso.org/iso-8601-date-and-time-format.html). Bootbox does not enforce this rule, but your min value may not be enforced by this browser.');else if('time'===e){if(t!==u&&!(r=y(t)))throw new Error('"min" is not a valid time. See https://www.w3.org/TR/2012/WD-html-markup-20120315/datatypes.html#form.data.time for more information.');if(o!==u&&!(n=y(o)))throw new Error('"max" is not a valid time. See https://www.w3.org/TR/2012/WD-html-markup-20120315/datatypes.html#form.data.time for more information.')}else{if(t!==u&&isNaN(t))throw new Error('"min" must be a valid number. See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-min for more information.');if(o!==u&&isNaN(o))throw new Error('"max" must be a valid number. See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-max for more information.')}if(r&&n){if(o<=t)throw new Error('"max" must be greater than "min". See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-max for more information.');a=!0}return a})(r.inputType,r.min,r.max)&&(r.min!==u&&n.attr('min',r.min),r.max!==u&&n.attr('max',r.max));break;case'select':var i={};if(a=r.inputOptions||[],!p.isArray(a))throw new Error('Please pass an array of input options');if(!a.length)throw new Error('prompt with "inputType" set to "select" requires at least one option');r.placeholder&&n.attr('placeholder',r.placeholder),r.required&&n.prop({required:!0}),r.multiple&&n.prop({multiple:!0}),w(a,function(e,t){var o=n;if(t.value===u||t.text===u)throw new Error('each option needs a "value" property and a "text" property');t.group&&(i[t.group]||(i[t.group]=p('<optgroup />').attr('label',t.group)),o=i[t.group]);var a=p(f.option);a.attr('value',t.value).text(t.text),o.append(a)}),w(i,function(e,t){n.append(t)}),n.val(r.value);break;case'checkbox':var l=p.isArray(r.value)?r.value:[r.value];if(!(a=r.inputOptions||[]).length)throw new Error('prompt with "inputType" set to "checkbox" requires at least one option');n=p('<div class="bootbox-checkbox-list"></div>'),w(a,function(e,o){if(o.value===u||o.text===u)throw new Error('each option needs a "value" property and a "text" property');var a=p(f.inputs[r.inputType]);a.find('input').attr('value',o.value),a.find('label').append('\n'+o.text),w(l,function(e,t){t===o.value&&a.find('input').prop('checked',!0)}),n.append(a)});break;case'radio':if(r.value!==u&&p.isArray(r.value))throw new Error('prompt with "inputType" set to "radio" requires a single, non-array value for "value"');if(!(a=r.inputOptions||[]).length)throw new Error('prompt with "inputType" set to "radio" requires at least one option');n=p('<div class="bootbox-radiobutton-list"></div>');var s=!0;w(a,function(e,t){if(t.value===u||t.text===u)throw new Error('each option needs a "value" property and a "text" property');var o=p(f.inputs[r.inputType]);o.find('input').attr('value',t.value),o.find('label').append('\n'+t.text),r.value!==u&&t.value===r.value&&(o.find('input').prop('checked',!0),s=!1),n.append(o)}),s&&n.find('input[type="radio"]').first().prop('checked',!0)}if(e.append(n),e.on('submit',function(e){e.preventDefault(),e.stopPropagation(),t.find('.bootbox-accept').trigger('click')}),''!==p.trim(r.message)){var c=p(f.promptMessage).html(r.message);e.prepend(c),r.message=e}else r.message=e;return(t=d.dialog(r)).off('shown.bs.modal'),t.on('shown.bs.modal',function(){n.focus()}),!0===o&&t.modal('show'),t},d.addLocale('en',{OK:'OK',CANCEL:'Cancel',CONFIRM:'OK'}),d});
\ No newline at end of file
diff --git a/dist/bootbox.zip b/dist/bootbox.zip
deleted file mode 100644
index 7add32df..00000000
Binary files a/dist/bootbox.zip and /dev/null differ
diff --git a/dist/bootstrap.zip b/dist/bootstrap.zip
new file mode 100644
index 00000000..c02fc23b
Binary files /dev/null and b/dist/bootstrap.zip differ
diff --git a/header.txt b/header.txt
index 9fde8861..889ae70e 100644
--- a/header.txt
+++ b/header.txt
@@ -1,5 +1,5 @@
 /**
- * bootbox.js 5.0.1
+ * bootbox.js 5.1.0
  *
  * http://bootboxjs.com/license.txt
  */
\ No newline at end of file
diff --git a/src/bootbox.js b/src/bootbox.js
index 4333f9e1..098f41cf 100644
--- a/src/bootbox.js
+++ b/src/bootbox.js
@@ -146,7 +146,9 @@
     // center modal vertically in page
     centerVertical: false,
     // Append "multiple" property to the select when using the "prompt" helper
-    multiple: false
+    multiple: false,
+    // Automatically scroll modal content when height exceeds viewport height
+    scrollable: false
   };
 
 
diff --git a/tests/defaults.test.js b/tests/defaults.test.js
index bdca5143..ec912038 100644
--- a/tests/defaults.test.js
+++ b/tests/defaults.test.js
@@ -72,6 +72,37 @@ describe('bootbox.setDefaults', function() {
   });
 
   describe('size', function() {
+    describe('when set to extra-large', function() {
+      beforeEach(function() {
+        bootbox.setDefaults({
+          size: 'extra-large'
+        });
+
+        this.dialog = bootbox.dialog({
+          message: 'test'
+        });
+      });
+
+      it('adds the extra-large class to the innerDialog', function() {
+        expect(this.dialog.children('.modal-dialog').hasClass('modal-xl')).to.be.true;
+      });
+    });
+    describe('when set to xl', function() {
+      beforeEach(function() {
+        bootbox.setDefaults({
+          size: 'xl'
+        });
+
+        this.dialog = bootbox.dialog({
+          message: 'test'
+        });
+      });
+
+      it('adds the extra-large class to the innerDialog', function() {
+        expect(this.dialog.children('.modal-dialog').hasClass('modal-xl')).to.be.true;
+      });
+    });
+
     describe('when set to large', function() {
       beforeEach(function() {
         bootbox.setDefaults({
@@ -87,6 +118,22 @@ describe('bootbox.setDefaults', function() {
         expect(this.dialog.children('.modal-dialog').hasClass('modal-lg')).to.be.true;
       });
     });
+    describe('when set to lg', function() {
+      beforeEach(function() {
+        bootbox.setDefaults({
+          size: 'lg'
+        });
+
+        this.dialog = bootbox.dialog({
+          message: 'test'
+        });
+      });
+
+      it('adds the large class to the innerDialog', function() {
+        expect(this.dialog.children('.modal-dialog').hasClass('modal-lg')).to.be.true;
+      });
+    });
+
     describe('when set to small', function() {
       beforeEach(function() {
         bootbox.setDefaults({
@@ -98,6 +145,21 @@ describe('bootbox.setDefaults', function() {
         });
       });
 
+      it('adds the small class to the innerDialog', function() {
+        expect(this.dialog.children('.modal-dialog').hasClass('modal-sm')).to.be.true;
+      });
+    });
+    describe('when set to sm', function() {
+      beforeEach(function() {
+        bootbox.setDefaults({
+          size: 'sm'
+        });
+
+        this.dialog = bootbox.dialog({
+          message: 'test'
+        });
+      });
+
       it('adds the small class to the innerDialog', function() {
         expect(this.dialog.children('.modal-dialog').hasClass('modal-sm')).to.be.true;
       });
@@ -139,6 +201,24 @@ describe('bootbox.setDefaults', function() {
       });
     });
   });
+  
+  describe('scrollable', function() {
+    describe('when set to true', function() {
+      beforeEach(function() {
+        bootbox.setDefaults({
+          scrollable: true
+        });
+
+        this.dialog = bootbox.dialog({
+          message: 'test'
+        });
+      });
+
+      it('adds the modal-dialog-scrollable class to the innerDialog', function() {
+        expect(this.dialog.children('.modal-dialog').hasClass('modal-dialog-scrollable')).to.be.true;
+      });
+    });
+  });
 
   describe('when passed two arguments', function() {
     beforeEach(function() {