diff --git a/composer.json b/composer.json
index 6c53206..9ffa8f9 100644
--- a/composer.json
+++ b/composer.json
@@ -65,7 +65,7 @@
   ],
   "require": {
     "grpc/grpc": "^1.15.0",
-    "google/protobuf": "^v3.6.1",
+    "google/protobuf": "^v4.33.6",
     "finam/grpc-txsecurities": "^0.0.1",
     "finam/grpc-marketdata": "^0.0.1",
     "finam/grpc-proto": "^0.0.1",
diff --git a/composer.lock b/composer.lock
index a477217..1c6875f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_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": "7b325c27ca31e7a12bafb50fd01a5e00",
+    "content-hash": "e312f60d0c8c0411efe2892a9f5dc799",
     "packages": [
         {
             "name": "finam/grpc-marketdata",
@@ -36,6 +36,16 @@
             },
             "type": "library"
         },
+        {
+            "name": "finam/grpc-txauth",
+            "version": "0.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://git.finam.ru/scm/ser/grpc-txauth.git",
+                "reference": "master"
+            },
+            "type": "library"
+        },
         {
             "name": "finam/grpc-txsecurities",
             "version": "0.0.1",
@@ -48,23 +58,23 @@
         },
         {
             "name": "google/protobuf",
-            "version": "v3.6.1",
+            "version": "v4.33.6",
             "source": {
                 "type": "git",
-                "url": "https://github.com/google/protobuf.git",
-                "reference": "48cb18e5c419ddd23d9badcfe4e9df7bde1979b2"
+                "url": "https://github.com/protocolbuffers/protobuf-php.git",
+                "reference": "84b008c23915ed94536737eae46f41ba3bccfe67"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/google/protobuf/zipball/48cb18e5c419ddd23d9badcfe4e9df7bde1979b2",
-                "reference": "48cb18e5c419ddd23d9badcfe4e9df7bde1979b2",
+                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/84b008c23915ed94536737eae46f41ba3bccfe67",
+                "reference": "84b008c23915ed94536737eae46f41ba3bccfe67",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5.0"
+                "php": ">=8.1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": ">=4.8.0"
+                "phpunit/phpunit": ">=10.5.62 <11.0.0"
             },
             "suggest": {
                 "ext-bcmath": "Need to support JSON deserialization"
@@ -72,8 +82,8 @@
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "Google\\Protobuf\\": "php/src/Google/Protobuf",
-                    "GPBMetadata\\Google\\Protobuf\\": "php/src/GPBMetadata/Google/Protobuf"
+                    "Google\\Protobuf\\": "src/Google/Protobuf",
+                    "GPBMetadata\\Google\\Protobuf\\": "src/GPBMetadata/Google/Protobuf"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -85,7 +95,10 @@
             "keywords": [
                 "proto"
             ],
-            "time": "2018-07-27T20:30:28+00:00"
+            "support": {
+                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v4.33.6"
+            },
+            "time": "2026-03-18T17:32:05+00:00"
         },
         {
             "name": "grpc/grpc",
@@ -132,9 +145,10 @@
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": []
+    "platform": {},
+    "platform-dev": {},
+    "plugin-api-version": "2.9.0"
 }