diff --git a/composer.lock b/composer.lock
index 8c53ab8..954dd59 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,7 +1,7 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
     "content-hash": "3642effde69982981be72029b5014387",
@@ -168,23 +168,17 @@
         },
         {
             "name": "google/protobuf",
-            "version": "v3.3.2",
+            "version": "v3.15.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/google/protobuf.git",
-                "reference": "5532abc15b97f3489183b266b41844306052a3fa"
+                "url": "https://github.com/protocolbuffers/protobuf-php.git",
+                "reference": "758a0ef01c7bdf20d7ff31295d2af872547cc072"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/google/protobuf/zipball/5532abc15b97f3489183b266b41844306052a3fa",
-                "reference": "5532abc15b97f3489183b266b41844306052a3fa",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://dl.laravel-china.org/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
+                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/758a0ef01c7bdf20d7ff31295d2af872547cc072",
+                "reference": "758a0ef01c7bdf20d7ff31295d2af872547cc072",
+                "shasum": ""
             },
             "require": {
                 "php": ">=5.5.0"
@@ -192,15 +186,15 @@
             "require-dev": {
                 "phpunit/phpunit": ">=4.8.0"
             },
+            "suggest": {
+                "ext-bcmath": "Need to support JSON deserialization"
+            },
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "Google\\Protobuf\\Internal\\": "php/src/Google/Protobuf/Internal",
-                    "GPBMetadata\\Google\\Protobuf\\Internal\\": "php/src/GPBMetadata/Google/Protobuf/Internal"
-                },
-                "files": [
-                    "php/src/Google/Protobuf/descriptor.php"
-                ]
+                    "Google\\Protobuf\\": "src/Google/Protobuf",
+                    "GPBMetadata\\Google\\Protobuf\\": "src/GPBMetadata/Google/Protobuf"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -211,7 +205,11 @@
             "keywords": [
                 "proto"
             ],
-            "time": "2017-06-21T22:29:32+00:00"
+            "support": {
+                "issues": "https://github.com/protocolbuffers/protobuf-php/issues",
+                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v3.15.0"
+            },
+            "time": "2021-02-18T22:06:03+00:00"
         },
         {
             "name": "grpc/grpc",
@@ -4171,5 +4169,6 @@
     "platform": {
         "php": ">=5.6.4"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.2.0"
 }