diff --git a/composer.json b/composer.json
index 8666885..0ead254 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
   "description": "A php library for the codeCTRL logger.",
   "type": "library",
   "require": {
-    "google/protobuf": "^3.21",
+    "google/protobuf": "^3.21 || ^4.0",
     "grpc/grpc": "^1.42"
   },
   "license": "MIT",
diff --git a/composer.lock b/composer.lock
index 518a0a8..91a19d6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,27 +4,27 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "442d22234279222fb832687302f2d2bb",
+    "content-hash": "8586a37a17c237630079e4a09a4c1cb9",
     "packages": [
         {
             "name": "google/protobuf",
-            "version": "v3.21.6",
+            "version": "v4.33.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/protocolbuffers/protobuf-php.git",
-                "reference": "d8832b49cf82052bdd5d0bbb573210c473642249"
+                "reference": "84b008c23915ed94536737eae46f41ba3bccfe67"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/d8832b49cf82052bdd5d0bbb573210c473642249",
-                "reference": "d8832b49cf82052bdd5d0bbb573210c473642249",
+                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/84b008c23915ed94536737eae46f41ba3bccfe67",
+                "reference": "84b008c23915ed94536737eae46f41ba3bccfe67",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.0.0"
+                "php": ">=8.1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": ">=5.0.0"
+                "phpunit/phpunit": ">=10.5.62 <11.0.0"
             },
             "suggest": {
                 "ext-bcmath": "Need to support JSON deserialization"
@@ -46,9 +46,9 @@
                 "proto"
             ],
             "support": {
-                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v3.21.6"
+                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v4.33.6"
             },
-            "time": "2022-09-13T23:46:29+00:00"
+            "time": "2026-03-18T17:32:05+00:00"
         },
         {
             "name": "grpc/grpc",
@@ -98,10 +98,10 @@
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "platform": {},
+    "platform-dev": {},
+    "plugin-api-version": "2.9.0"
 }