diff --git a/composer.json b/composer.json
index bb86a551..90c7e741 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
         "ext-json": "*",
         "composer-runtime-api": "^2.2",
         "composer/class-map-generator": "^1.0",
-        "google/protobuf": "^4.26",
+        "google/protobuf": "^5.34",
         "jetbrains/phpstorm-stubs": "^2024.1",
         "nikic/php-parser": "^5.0",
         "phpstan/phpdoc-parser": "^1.20"
diff --git a/composer.lock b/composer.lock
index 12f257e7..1cb75eb1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b6b3bde37d568217b2771552fcbd4fc2",
+    "content-hash": "4ced6191f0381b76bb4e5894d8ddd93e",
     "packages": [
         {
             "name": "composer/class-map-generator",
@@ -156,23 +156,23 @@
         },
         {
             "name": "google/protobuf",
-            "version": "v4.33.3",
+            "version": "v5.34.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/protocolbuffers/protobuf-php.git",
-                "reference": "281537d44d6c270606354e65bfa75a0969dbd629"
+                "reference": "1debe453db83159b98a38df5a3737feb1e8ef016"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/281537d44d6c270606354e65bfa75a0969dbd629",
-                "reference": "281537d44d6c270606354e65bfa75a0969dbd629",
+                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/1debe453db83159b98a38df5a3737feb1e8ef016",
+                "reference": "1debe453db83159b98a38df5a3737feb1e8ef016",
                 "shasum": ""
             },
             "require": {
-                "php": ">=8.1.0"
+                "php": ">=8.2.0"
             },
             "require-dev": {
-                "phpunit/phpunit": ">=5.0.0 <8.5.27"
+                "phpunit/phpunit": ">=11.5.0 <12.0.0"
             },
             "suggest": {
                 "ext-bcmath": "Need to support JSON deserialization"
@@ -194,9 +194,9 @@
                 "proto"
             ],
             "support": {
-                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v4.33.3"
+                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v5.34.0"
             },
-            "time": "2026-01-09T21:49:37+00:00"
+            "time": "2026-02-25T21:19:40+00:00"
         },
         {
             "name": "jetbrains/phpstorm-stubs",