diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff2375e0..34a7b5b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [4.1.1] - 2025-11-12
+### Security
+- Fix prototype pollution issue in yaml merge (<<) operator.
+
+
 ## [4.1.0] - 2021-04-15
 ### Added
 - Types are now exported as `yaml.types.XXX`.
diff --git a/README.md b/README.md
index 3cbc4bd2..eeaf531c 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,11 @@ JS-YAML - YAML 1.2 parser / writer for JavaScript
 [![CI](https://github.com/nodeca/js-yaml/workflows/CI/badge.svg?branch=master)](https://github.com/nodeca/js-yaml/actions)
 [![NPM version](https://img.shields.io/npm/v/js-yaml.svg)](https://www.npmjs.org/package/js-yaml)
 
-__[Online Demo](http://nodeca.github.com/js-yaml/)__
+__[Online Demo](https://nodeca.github.io/js-yaml/)__
 
 
-This is an implementation of [YAML](http://yaml.org/), a human-friendly data
-serialization language. Started as [PyYAML](http://pyyaml.org/) port, it was
+This is an implementation of [YAML](https://yaml.org/), a human-friendly data
+serialization language. Started as [PyYAML](https://pyyaml.org/) port, it was
 completely rewritten from scratch. Now it's very fast, and supports 1.2 spec.
 
 
@@ -81,11 +81,11 @@ options:
   Loader will call this function with an instance of `YAMLException` for each warning.
 - `schema` _(default: `DEFAULT_SCHEMA`)_ - specifies a schema to use.
   - `FAILSAFE_SCHEMA` - only strings, arrays and plain objects:
-    http://www.yaml.org/spec/1.2/spec.html#id2802346
+    https://www.yaml.org/spec/1.2/spec.html#id2802346
   - `JSON_SCHEMA` - all JSON-supported types:
-    http://www.yaml.org/spec/1.2/spec.html#id2803231
+    https://www.yaml.org/spec/1.2/spec.html#id2803231
   - `CORE_SCHEMA` - same as `JSON_SCHEMA`:
-    http://www.yaml.org/spec/1.2/spec.html#id2804923
+    https://www.yaml.org/spec/1.2/spec.html#id2804923
   - `DEFAULT_SCHEMA` - all supported YAML types.
 - `json` _(default: false)_ - compatibility with JSON.parse behaviour. If true, then duplicate keys in a mapping will override values rather than throwing an error.
 
@@ -149,6 +149,7 @@ output is shown on the right side after `=>` (default setting) or `->`:
   "lowercase"   => "null"
   "uppercase"   -> "NULL"
   "camelcase"   -> "Null"
+  "empty"       -> ""
 
 !!int
   "binary"      -> "0b1", "0b101010", "0b1110001111010"
@@ -182,8 +183,8 @@ Supported YAML types
 --------------------
 
 The list of standard YAML tags and corresponding JavaScript types. See also
-[YAML tag discussion](http://pyyaml.org/wiki/YAMLTagDiscussion) and
-[YAML types repository](http://yaml.org/type/).
+[YAML tag discussion](https://pyyaml.org/wiki/YAMLTagDiscussion) and
+[YAML types repository](https://yaml.org/type/).
 
 ```
 !!null ''                   # null
diff --git a/dist/js-yaml.js b/dist/js-yaml.js
index 4cc0ddf6..21c52eca 100644
--- a/dist/js-yaml.js
+++ b/dist/js-yaml.js
@@ -1,10 +1,10 @@
 
-/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
+/*! js-yaml 4.1.1 https://github.com/nodeca/js-yaml @license MIT */
 (function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
   typeof define === 'function' && define.amd ? define(['exports'], factory) :
   (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.jsyaml = {}));
-}(this, (function (exports) { 'use strict';
+})(this, (function (exports) { 'use strict';
 
   function isNothing(subject) {
     return (typeof subject === 'undefined') || (subject === null);
@@ -1216,6 +1216,22 @@
     );
   }
 
+  // set a property of a literal object, while protecting against prototype pollution,
+  // see https://github.com/nodeca/js-yaml/issues/164 for more details
+  function setProperty(object, key, value) {
+    // used for this specific key only because Object.defineProperty is slow
+    if (key === '__proto__') {
+      Object.defineProperty(object, key, {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value: value
+      });
+    } else {
+      object[key] = value;
+    }
+  }
+
   var simpleEscapeCheck = new Array(256); // integer, for fast access
   var simpleEscapeMap = new Array(256);
   for (var i = 0; i < 256; i++) {
@@ -1394,7 +1410,7 @@
       key = sourceKeys[index];
 
       if (!_hasOwnProperty$1.call(destination, key)) {
-        destination[key] = source[key];
+        setProperty(destination, key, source[key]);
         overridableKeys[key] = true;
       }
     }
@@ -1454,17 +1470,7 @@
         throwError(state, 'duplicated mapping key');
       }
 
-      // used for this specific key only because Object.defineProperty is slow
-      if (keyNode === '__proto__') {
-        Object.defineProperty(_result, keyNode, {
-          configurable: true,
-          enumerable: true,
-          writable: true,
-          value: valueNode
-        });
-      } else {
-        _result[keyNode] = valueNode;
-      }
+      setProperty(_result, keyNode, valueNode);
       delete overridableKeys[keyNode];
     }
 
@@ -3860,7 +3866,7 @@
   exports.Schema = Schema;
   exports.Type = Type;
   exports.YAMLException = YAMLException;
-  exports.default = jsYaml;
+  exports["default"] = jsYaml;
   exports.dump = dump;
   exports.load = load;
   exports.loadAll = loadAll;
@@ -3871,4 +3877,4 @@
 
   Object.defineProperty(exports, '__esModule', { value: true });
 
-})));
+}));
diff --git a/dist/js-yaml.min.js b/dist/js-yaml.min.js
index bdd8eef5..8e7f7664 100644
--- a/dist/js-yaml.min.js
+++ b/dist/js-yaml.min.js
@@ -1,2 +1,2 @@
-/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).jsyaml={})}(this,(function(e){"use strict";function t(e){return null==e}var n={isNothing:t,isObject:function(e){return"object"==typeof e&&null!==e},toArray:function(e){return Array.isArray(e)?e:t(e)?[]:[e]},repeat:function(e,t){var n,i="";for(n=0;n<t;n+=1)i+=e;return i},isNegativeZero:function(e){return 0===e&&Number.NEGATIVE_INFINITY===1/e},extend:function(e,t){var n,i,r,o;if(t)for(n=0,i=(o=Object.keys(t)).length;n<i;n+=1)e[r=o[n]]=t[r];return e}};function i(e,t){var n="",i=e.reason||"(unknown reason)";return e.mark?(e.mark.name&&(n+='in "'+e.mark.name+'" '),n+="("+(e.mark.line+1)+":"+(e.mark.column+1)+")",!t&&e.mark.snippet&&(n+="\n\n"+e.mark.snippet),i+" "+n):i}function r(e,t){Error.call(this),this.name="YAMLException",this.reason=e,this.mark=t,this.message=i(this,!1),Error.captureStackTrace?Error.captureStackTrace(this,this.constructor):this.stack=(new Error).stack||""}r.prototype=Object.create(Error.prototype),r.prototype.constructor=r,r.prototype.toString=function(e){return this.name+": "+i(this,e)};var o=r;function a(e,t,n,i,r){var o="",a="",l=Math.floor(r/2)-1;return i-t>l&&(t=i-l+(o=" ... 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",e.indent*t)}function Ye(e){return 32===e||9===e}function Re(e){return 32<=e&&e<=126||161<=e&&e<=55295&&8232!==e&&8233!==e||57344<=e&&e<=65533&&e!==Fe||65536<=e&&e<=1114111}function Be(e){return Re(e)&&e!==Fe&&13!==e&&10!==e}function Ke(e,t,n){var i=Be(e),r=i&&!Ye(e);return(n?i:i&&44!==e&&91!==e&&93!==e&&123!==e&&125!==e)&&35!==e&&!(58===t&&!r)||Be(t)&&!Ye(t)&&35===e||58===t&&r}function Pe(e,t){var n,i=e.charCodeAt(t);return i>=55296&&i<=56319&&t+1<e.length&&(n=e.charCodeAt(t+1))>=56320&&n<=57343?1024*(i-55296)+n-56320+65536:i}function We(e){return/^\n* /.test(e)}function He(e,t,n,i,r,o,a,l){var c,s,u=0,p=null,f=!1,d=!1,h=-1!==i,g=-1,m=Re(s=Pe(e,0))&&s!==Fe&&!Ye(s)&&45!==s&&63!==s&&58!==s&&44!==s&&91!==s&&93!==s&&123!==s&&125!==s&&35!==s&&38!==s&&42!==s&&33!==s&&124!==s&&61!==s&&62!==s&&39!==s&&34!==s&&37!==s&&64!==s&&96!==s&&function(e){return!Ye(e)&&58!==e}(Pe(e,e.length-1));if(t||a)for(c=0;c<e.length;u>=65536?c+=2:c++){if(!Re(u=Pe(e,c)))return 5;m=m&&Ke(u,p,l),p=u}else{for(c=0;c<e.length;u>=65536?c+=2:c++){if(10===(u=Pe(e,c)))f=!0,h&&(d=d||c-g-1>i&&" "!==e[g+1],g=c);else if(!Re(u))return 5;m=m&&Ke(u,p,l),p=u}d=d||h&&c-g-1>i&&" "!==e[g+1]}return f||d?n>9&&We(e)?5:a?2===o?5:2:d?4:3:!m||a||r(e)?2===o?5:2:1}function $e(e,t,n,i,r){e.dump=function(){if(0===t.length)return 2===e.quotingType?'""':"''";if(!e.noCompatMode&&(-1!==Me.indexOf(t)||Le.test(t)))return 2===e.quotingType?'"'+t+'"':"'"+t+"'";var a=e.indent*Math.max(1,n),l=-1===e.lineWidth?-1:Math.max(Math.min(e.lineWidth,40),e.lineWidth-a),c=i||e.flowLevel>-1&&n>=e.flowLevel;switch(He(t,c,e.indent,l,function(t){return function(e,t){var n,i;for(n=0,i=e.implicitTypes.length;n<i;n+=1)if(e.implicitTypes[n].resolve(t))return!0;return!1}(e,t)},e.quotingType,e.forceQuotes&&!i,r)){case 1:return t;case 2:return"'"+t.replace(/'/g,"''")+"'";case 3:return"|"+Ge(t,e.indent)+Ve(Ue(t,a));case 4:return">"+Ge(t,e.indent)+Ve(Ue(function(e,t){var n,i,r=/(\n+)([^\n]*)/g,o=(l=e.indexOf("\n"),l=-1!==l?l:e.length,r.lastIndex=l,Ze(e.slice(0,l),t)),a="\n"===e[0]||" "===e[0];var l;for(;i=r.exec(e);){var c=i[1],s=i[2];n=" "===s[0],o+=c+(a||n||""===s?"":"\n")+Ze(s,t),a=n}return o}(t,l),a));case 5:return'"'+function(e){for(var t,n="",i=0,r=0;r<e.length;i>=65536?r+=2:r++)i=Pe(e,r),!(t=Ee[i])&&Re(i)?(n+=e[r],i>=65536&&(n+=e[r+1])):n+=t||_e(i);return n}(t)+'"';default:throw new o("impossible error: invalid scalar style")}}()}function Ge(e,t){var n=We(e)?String(t):"",i="\n"===e[e.length-1];return n+(i&&("\n"===e[e.length-2]||"\n"===e)?"+":i?"":"-")+"\n"}function Ve(e){return"\n"===e[e.length-1]?e.slice(0,-1):e}function Ze(e,t){if(""===e||" "===e[0])return e;for(var n,i,r=/ [^ ]/g,o=0,a=0,l=0,c="";n=r.exec(e);)(l=n.index)-o>t&&(i=a>o?a:l,c+="\n"+e.slice(o,i),o=i+1),a=l;return c+="\n",e.length-o>t&&a>o?c+=e.slice(o,a)+"\n"+e.slice(a+1):c+=e.slice(o),c.slice(1)}function Je(e,t,n,i){var r,o,a,l="",c=e.tag;for(r=0,o=n.length;r<o;r+=1)a=n[r],e.replacer&&(a=e.replacer.call(n,String(r),a)),(ze(e,t+1,a,!0,!0,!1,!0)||void 0===a&&ze(e,t+1,null,!0,!0,!1,!0))&&(i&&""===l||(l+=qe(e,t)),e.dump&&10===e.dump.charCodeAt(0)?l+="-":l+="- ",l+=e.dump);e.tag=c,e.dump=l||"[]"}function Qe(e,t,n){var i,r,a,l,c,s;for(a=0,l=(r=n?e.explicitTypes:e.implicitTypes).length;a<l;a+=1)if(((c=r[a]).instanceOf||c.predicate)&&(!c.instanceOf||"object"==typeof t&&t instanceof c.instanceOf)&&(!c.predicate||c.predicate(t))){if(n?c.multi&&c.representName?e.tag=c.representName(t):e.tag=c.tag:e.tag="?",c.represent){if(s=e.styleMap[c.tag]||c.defaultStyle,"[object Function]"===Te.call(c.represent))i=c.represent(t,s);else{if(!Ne.call(c.represent,s))throw new o("!<"+c.tag+'> tag resolver accepts not "'+s+'" style');i=c.represent[s](t,s)}e.dump=i}return!0}return!1}function ze(e,t,n,i,r,a,l){e.tag=null,e.dump=n,Qe(e,n,!1)||Qe(e,n,!0);var c,s=Te.call(e.dump),u=i;i&&(i=e.flowLevel<0||e.flowLevel>t);var p,f,d="[object Object]"===s||"[object Array]"===s;if(d&&(f=-1!==(p=e.duplicates.indexOf(n))),(null!==e.tag&&"?"!==e.tag||f||2!==e.indent&&t>0)&&(r=!1),f&&e.usedDuplicates[p])e.dump="*ref_"+p;else{if(d&&f&&!e.usedDuplicates[p]&&(e.usedDuplicates[p]=!0),"[object Object]"===s)i&&0!==Object.keys(e.dump).length?(!function(e,t,n,i){var r,a,l,c,s,u,p="",f=e.tag,d=Object.keys(n);if(!0===e.sortKeys)d.sort();else if("function"==typeof e.sortKeys)d.sort(e.sortKeys);else if(e.sortKeys)throw new o("sortKeys must be a boolean or a function");for(r=0,a=d.length;r<a;r+=1)u="",i&&""===p||(u+=qe(e,t)),c=n[l=d[r]],e.replacer&&(c=e.replacer.call(n,l,c)),ze(e,t+1,l,!0,!0,!0)&&((s=null!==e.tag&&"?"!==e.tag||e.dump&&e.dump.length>1024)&&(e.dump&&10===e.dump.charCodeAt(0)?u+="?":u+="? "),u+=e.dump,s&&(u+=qe(e,t)),ze(e,t+1,c,!0,s)&&(e.dump&&10===e.dump.charCodeAt(0)?u+=":":u+=": ",p+=u+=e.dump));e.tag=f,e.dump=p||"{}"}(e,t,e.dump,r),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){var i,r,o,a,l,c="",s=e.tag,u=Object.keys(n);for(i=0,r=u.length;i<r;i+=1)l="",""!==c&&(l+=", "),e.condenseFlow&&(l+='"'),a=n[o=u[i]],e.replacer&&(a=e.replacer.call(n,o,a)),ze(e,t,o,!1,!1)&&(e.dump.length>1024&&(l+="? "),l+=e.dump+(e.condenseFlow?'"':"")+":"+(e.condenseFlow?"":" "),ze(e,t,a,!1,!1)&&(c+=l+=e.dump));e.tag=s,e.dump="{"+c+"}"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else if("[object Array]"===s)i&&0!==e.dump.length?(e.noArrayIndent&&!l&&t>0?Je(e,t-1,e.dump,r):Je(e,t,e.dump,r),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){var i,r,o,a="",l=e.tag;for(i=0,r=n.length;i<r;i+=1)o=n[i],e.replacer&&(o=e.replacer.call(n,String(i),o)),(ze(e,t,o,!1,!1)||void 0===o&&ze(e,t,null,!1,!1))&&(""!==a&&(a+=","+(e.condenseFlow?"":" ")),a+=e.dump);e.tag=l,e.dump="["+a+"]"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else{if("[object String]"!==s){if("[object Undefined]"===s)return!1;if(e.skipInvalid)return!1;throw new o("unacceptable kind of an object to dump "+s)}"?"!==e.tag&&$e(e,e.dump,t,a,u)}null!==e.tag&&"?"!==e.tag&&(c=encodeURI("!"===e.tag[0]?e.tag.slice(1):e.tag).replace(/!/g,"%21"),c="!"===e.tag[0]?"!"+c:"tag:yaml.org,2002:"===c.slice(0,18)?"!!"+c.slice(18):"!<"+c+">",e.dump=c+" "+e.dump)}return!0}function Xe(e,t){var n,i,r=[],o=[];for(et(e,r,o),n=0,i=o.length;n<i;n+=1)t.duplicates.push(r[o[n]]);t.usedDuplicates=new Array(i)}function et(e,t,n){var i,r,o;if(null!==e&&"object"==typeof e)if(-1!==(r=t.indexOf(e)))-1===n.indexOf(r)&&n.push(r);else if(t.push(e),Array.isArray(e))for(r=0,o=e.length;r<o;r+=1)et(e[r],t,n);else for(r=0,o=(i=Object.keys(e)).length;r<o;r+=1)et(e[i[r]],t,n)}function tt(e,t){return function(){throw new Error("Function yaml."+e+" is removed in js-yaml 4. Use yaml."+t+" instead, which is now safe by default.")}}var nt=p,it=h,rt=b,ot=j,at=T,lt=P,ct=je.load,st=je.loadAll,ut={dump:function(e,t){var n=new De(t=t||{});n.noRefs||Xe(e,n);var i=e;return n.replacer&&(i=n.replacer.call({"":i},"",i)),ze(n,0,i,!0,!0)?n.dump+"\n":""}}.dump,pt=o,ft={binary:_,float:O,map:y,null:A,pairs:R,set:K,timestamp:E,bool:v,int:x,merge:M,omap:q,seq:m,str:g},dt=tt("safeLoad","load"),ht=tt("safeLoadAll","loadAll"),gt=tt("safeDump","dump"),mt={Type:nt,Schema:it,FAILSAFE_SCHEMA:rt,JSON_SCHEMA:ot,CORE_SCHEMA:at,DEFAULT_SCHEMA:lt,load:ct,loadAll:st,dump:ut,YAMLException:pt,types:ft,safeLoad:dt,safeLoadAll:ht,safeDump:gt};e.CORE_SCHEMA=at,e.DEFAULT_SCHEMA=lt,e.FAILSAFE_SCHEMA=rt,e.JSON_SCHEMA=ot,e.Schema=it,e.Type=nt,e.YAMLException=pt,e.default=mt,e.dump=ut,e.load=ct,e.loadAll=st,e.safeDump=gt,e.safeLoad=dt,e.safeLoadAll=ht,e.types=ft,Object.defineProperty(e,"__esModule",{value:!0})});
diff --git a/dist/js-yaml.mjs b/dist/js-yaml.mjs
index be71cad1..b87ca0e0 100644
--- a/dist/js-yaml.mjs
+++ b/dist/js-yaml.mjs
@@ -1,5 +1,5 @@
 
-/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
+/*! js-yaml 4.1.1 https://github.com/nodeca/js-yaml @license MIT */
 function isNothing(subject) {
   return (typeof subject === 'undefined') || (subject === null);
 }
@@ -1210,6 +1210,22 @@ function charFromCodepoint(c) {
   );
 }
 
+// set a property of a literal object, while protecting against prototype pollution,
+// see https://github.com/nodeca/js-yaml/issues/164 for more details
+function setProperty(object, key, value) {
+  // used for this specific key only because Object.defineProperty is slow
+  if (key === '__proto__') {
+    Object.defineProperty(object, key, {
+      configurable: true,
+      enumerable: true,
+      writable: true,
+      value: value
+    });
+  } else {
+    object[key] = value;
+  }
+}
+
 var simpleEscapeCheck = new Array(256); // integer, for fast access
 var simpleEscapeMap = new Array(256);
 for (var i = 0; i < 256; i++) {
@@ -1388,7 +1404,7 @@ function mergeMappings(state, destination, source, overridableKeys) {
     key = sourceKeys[index];
 
     if (!_hasOwnProperty$1.call(destination, key)) {
-      destination[key] = source[key];
+      setProperty(destination, key, source[key]);
       overridableKeys[key] = true;
     }
   }
@@ -1448,17 +1464,7 @@ function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valu
       throwError(state, 'duplicated mapping key');
     }
 
-    // used for this specific key only because Object.defineProperty is slow
-    if (keyNode === '__proto__') {
-      Object.defineProperty(_result, keyNode, {
-        configurable: true,
-        enumerable: true,
-        writable: true,
-        value: valueNode
-      });
-    } else {
-      _result[keyNode] = valueNode;
-    }
+    setProperty(_result, keyNode, valueNode);
     delete overridableKeys[keyNode];
   }
 
@@ -3847,5 +3853,4 @@ var jsYaml = {
 	safeDump: safeDump
 };
 
-export default jsYaml;
-export { CORE_SCHEMA, DEFAULT_SCHEMA, FAILSAFE_SCHEMA, JSON_SCHEMA, Schema, Type, YAMLException, dump, load, loadAll, safeDump, safeLoad, safeLoadAll, types };
+export { CORE_SCHEMA, DEFAULT_SCHEMA, FAILSAFE_SCHEMA, JSON_SCHEMA, Schema, Type, YAMLException, jsYaml as default, dump, load, loadAll, safeDump, safeLoad, safeLoadAll, types };
diff --git a/lib/loader.js b/lib/loader.js
index 39f13f56..25abc808 100644
--- a/lib/loader.js
+++ b/lib/loader.js
@@ -120,6 +120,22 @@ function charFromCodepoint(c) {
   );
 }
 
+// set a property of a literal object, while protecting against prototype pollution,
+// see https://github.com/nodeca/js-yaml/issues/164 for more details
+function setProperty(object, key, value) {
+  // used for this specific key only because Object.defineProperty is slow
+  if (key === '__proto__') {
+    Object.defineProperty(object, key, {
+      configurable: true,
+      enumerable: true,
+      writable: true,
+      value: value
+    });
+  } else {
+    object[key] = value;
+  }
+}
+
 var simpleEscapeCheck = new Array(256); // integer, for fast access
 var simpleEscapeMap = new Array(256);
 for (var i = 0; i < 256; i++) {
@@ -298,7 +314,7 @@ function mergeMappings(state, destination, source, overridableKeys) {
     key = sourceKeys[index];
 
     if (!_hasOwnProperty.call(destination, key)) {
-      destination[key] = source[key];
+      setProperty(destination, key, source[key]);
       overridableKeys[key] = true;
     }
   }
@@ -358,17 +374,7 @@ function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valu
       throwError(state, 'duplicated mapping key');
     }
 
-    // used for this specific key only because Object.defineProperty is slow
-    if (keyNode === '__proto__') {
-      Object.defineProperty(_result, keyNode, {
-        configurable: true,
-        enumerable: true,
-        writable: true,
-        value: valueNode
-      });
-    } else {
-      _result[keyNode] = valueNode;
-    }
+    setProperty(_result, keyNode, valueNode);
     delete overridableKeys[keyNode];
   }
 
diff --git a/package.json b/package.json
index 17574da8..5bbd6c95 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "js-yaml",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "description": "YAML 1.2 parser and serializer",
   "keywords": [
     "yaml",
diff --git a/test/issues/0164.js b/test/issues/0164.js
index 963087f1..8240318d 100644
--- a/test/issues/0164.js
+++ b/test/issues/0164.js
@@ -6,9 +6,25 @@ const yaml = require('../../');
 
 
 it('should define __proto__ as a value (not invoke setter)', function () {
-  let object = yaml.load('{ __proto__: {foo: bar} }');
+  let object = yaml.load('{ __proto__: {polluted: bar} }');
 
   assert.strictEqual(({}).hasOwnProperty.call(yaml.load('{}'), '__proto__'), false);
   assert.strictEqual(({}).hasOwnProperty.call(object, '__proto__'), true);
-  assert(!object.foo);
+  assert(!object.polluted);
+});
+
+
+it('should merge __proto__ as a value with << operator', function () {
+  let object = yaml.load(`
+payload: &ref
+  polluted: bar
+
+foo:
+  <<:
+    __proto__: *ref
+  `);
+
+  assert.strictEqual(({}).hasOwnProperty.call(yaml.load('{}'), '__proto__'), false);
+  assert.strictEqual(({}).hasOwnProperty.call(object.foo, '__proto__'), true);
+  assert(!object.foo.polluted);
 });