diff --git a/README.md b/README.md
index a11f302..736ed85 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # json-stringify-safe
 
-Like JSON.stringify, but doesn't throw on circular references.
+Like JSON.stringify, but doesn't throw on circular references and BigInt values.
 
 ## Usage
 
@@ -11,6 +11,7 @@ var stringify = require('json-stringify-safe');
 var circularObj = {};
 circularObj.circularRef = circularObj;
 circularObj.list = [ circularObj, circularObj ];
+circularObj.bigint = 1n;
 console.log(stringify(circularObj, null, 2));
 ```
 
@@ -22,7 +23,8 @@ Output:
   "list": [
     "[Circular]",
     "[Circular]"
-  ]
+  ],
+  "bigint": "1"
 }
 ```
 
@@ -41,6 +43,8 @@ will prune cycles.  If you pass in `function(k,v){ return {foo: 'bar'}}`,
 then cyclical objects will always be represented as `{"foo":"bar"}` in
 the result.
 
+`BigInt` values are serialized as strings.
+
 ```
 stringify.getSerialize(serializer, decycler)
 ```
diff --git a/package.json b/package.json
index 4ab27ed..3de2ae5 100644
--- a/package.json
+++ b/package.json
@@ -1,18 +1,20 @@
 {
   "name": "json-stringify-safe",
-  "version": "5.0.1",
-  "description": "Like JSON.stringify, but doesn't blow up on circular refs.",
+  "version": "5.1.0",
+  "description": "Like JSON.stringify, but doesn't blow up on circular refs and BigInts.",
   "keywords": [
     "json",
     "stringify",
     "circular",
-    "safe"
+    "safe",
+    "bigint"
   ],
   "homepage": "https://github.com/isaacs/json-stringify-safe",
   "bugs": "https://github.com/isaacs/json-stringify-safe/issues",
   "author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me)",
   "contributors": [
-    "Andri Möll <andri@dot.ee> (http://themoll.com)"
+    "Andri Möll <andri@dot.ee> (http://themoll.com)",
+    "Luka Maljic <luka@maljic.com> (https://codecraft.dev)"
   ],
   "license": "ISC",
   "repository": {
diff --git a/stringify.js b/stringify.js
index 124a452..4a9d196 100644
--- a/stringify.js
+++ b/stringify.js
@@ -22,6 +22,8 @@ function serializer(replacer, cycleReplacer) {
     }
     else stack.push(value)
 
+    if (typeof value === "bigint") value = value.toString()
+
     return replacer == null ? value : replacer.call(this, key, value)
   }
 }
diff --git a/test/stringify_test.js b/test/stringify_test.js
index 5b32583..3d4f414 100644
--- a/test/stringify_test.js
+++ b/test/stringify_test.js
@@ -98,6 +98,19 @@ describe("Stringify", function() {
     json.must.eql(jsonify([{name: "Alice"}, {name: "Alice"}]))
   })
 
+  it("must stringify BigInts", function() {
+    var bigint = 1n
+    var json = stringify(bigint, null, 2)
+    json.must.eql(jsonify("1"))
+  })
+
+  it("must stringify circular objects with BigInts", function() {
+    var obj = {n: 1n}
+    obj.identity = {self: obj}
+    var json = stringify(obj, null, 2)
+    json.must.eql(jsonify({n: "1", identity: {self: "[Circular ~]"}}))
+  })
+
   it("must call given decycler and use its output", function() {
     var obj = {}
     obj.a = obj