diff --git a/composer.lock b/composer.lock
index b4731a0..d964fcd 100644
--- a/composer.lock
+++ b/composer.lock
@@ -522,23 +522,23 @@
         },
         {
             "name": "google/protobuf",
-            "version": "v4.33.2",
+            "version": "v4.33.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/protocolbuffers/protobuf-php.git",
-                "reference": "fbd96b7bf1343f4b0d8fb358526c7ba4d72f1318"
+                "reference": "84b008c23915ed94536737eae46f41ba3bccfe67"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/fbd96b7bf1343f4b0d8fb358526c7ba4d72f1318",
-                "reference": "fbd96b7bf1343f4b0d8fb358526c7ba4d72f1318",
+                "url": "https://api.github.com/repos/protocolbuffers/protobuf-php/zipball/84b008c23915ed94536737eae46f41ba3bccfe67",
+                "reference": "84b008c23915ed94536737eae46f41ba3bccfe67",
                 "shasum": ""
             },
             "require": {
                 "php": ">=8.1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": ">=5.0.0 <8.5.27"
+                "phpunit/phpunit": ">=10.5.62 <11.0.0"
             },
             "suggest": {
                 "ext-bcmath": "Need to support JSON deserialization"
@@ -560,9 +560,9 @@
                 "proto"
             ],
             "support": {
-                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v4.33.2"
+                "source": "https://github.com/protocolbuffers/protobuf-php/tree/v4.33.6"
             },
-            "time": "2025-12-05T22:12:22+00:00"
+            "time": "2026-03-18T17:32:05+00:00"
         },
         {
             "name": "grpc/grpc",
@@ -1633,5 +1633,5 @@
     "prefer-lowest": false,
     "platform": {},
     "platform-dev": {},
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }