diff --git a/node_modules/protobufjs/cli/lib/tsd-jsdoc/publish.js b/node_modules/protobufjs/cli/lib/tsd-jsdoc/publish.js
index 3846a99..6c5688a 100644
--- a/node_modules/protobufjs/cli/lib/tsd-jsdoc/publish.js
+++ b/node_modules/protobufjs/cli/lib/tsd-jsdoc/publish.js
@@ -558,6 +558,13 @@ function handleClass(element, parent) {
         handleElement(child, element);
     });
 
+    writeln();
+    if (is_interface) {
+        writeln("__unknownFields?: ReadonlyArray<Uint8Array>;");
+    } else {
+        writeln("public __unknownFields?: ReadonlyArray<Uint8Array>;");
+    }
+
     --indent;
     writeln("}");
 
diff --git a/node_modules/protobufjs/src/decoder.js b/node_modules/protobufjs/src/decoder.js
index 491dd30..ec03e9f 100644
--- a/node_modules/protobufjs/src/decoder.js
+++ b/node_modules/protobufjs/src/decoder.js
@@ -21,6 +21,7 @@ function decoder(mtype) {
         ("r=Reader.create(r)")
     ("var c=l===undefined?r.len:r.pos+l,m=new this.ctor" + (mtype.fieldsArray.filter(function(field) { return field.map; }).length ? ",k,value" : ""))
     ("while(r.pos<c){")
+        ("var unknownStartPos = r.pos")
         ("var t=r.uint32()");
     if (mtype.group) gen
         ("if((t&7)===4)")
@@ -28,6 +29,8 @@ function decoder(mtype) {
     gen
         ("switch(t>>>3){");
 
+    var unknownRef = "m" + util.safeProp("__unknownFields");
+
     var i = 0;
     for (; i < /* initializes */ mtype.fieldsArray.length; ++i) {
         var field = mtype._fieldsArray[i].resolve(),
@@ -109,6 +112,11 @@ function decoder(mtype) {
     } gen
             ("default:")
                 ("r.skipType(t&7)")
+                ("if (!(%s)) {", unknownRef)
+                    ("%s = []", unknownRef)
+                ("}")
+
+                ("%s.push(r.buf.slice(unknownStartPos, r.pos))", unknownRef)
                 ("break")
 
         ("}")
diff --git a/node_modules/protobufjs/src/encoder.js b/node_modules/protobufjs/src/encoder.js
index c803e99..d3c6e86 100644
--- a/node_modules/protobufjs/src/encoder.js
+++ b/node_modules/protobufjs/src/encoder.js
@@ -94,6 +94,13 @@ function encoder(mtype) {
         }
     }
 
+    var unknownRef = "m" + util.safeProp("__unknownFields");
+    gen
+    ("if (%s) {", unknownRef)
+      ("for (var i=0;i<%s.length;++i)", unknownRef)
+        ("w.__unknownField(%s[i])", unknownRef)
+    ("}")
+
     return gen
     ("return w");
     /* eslint-enable no-unexpected-multiline, block-scoped-var, no-redeclare */
diff --git a/node_modules/protobufjs/src/writer.js b/node_modules/protobufjs/src/writer.js
index cc84a00..3fb6139 100644
--- a/node_modules/protobufjs/src/writer.js
+++ b/node_modules/protobufjs/src/writer.js
@@ -383,6 +383,10 @@ Writer.prototype.bytes = function write_bytes(value) {
     return this.uint32(len)._push(writeBytes, len, value);
 };
 
+Writer.prototype.__unknownField = function __unknownField(field) {
+    return this._push(writeBytes, field.length, field);
+};
+
 /**
  * Writes a string.
  * @param {string} value Value to write