diff --git a/experimental/CHANGELOG.md b/experimental/CHANGELOG.md
index c64dce988b5..be3cb728d90 100644
--- a/experimental/CHANGELOG.md
+++ b/experimental/CHANGELOG.md
@@ -14,6 +14,7 @@ For notes on migrating to 2.x / 0.200.x see [the upgrade guide](doc/upgrade-to-2
 
 * fix(otlp-exporter-base): remove sendBeacon in favor of fetch with keepalive [#6391](https://github.com/open-telemetry/opentelemetry-js/pull/6391) @overbalance
   * (user-facing) createOtlpSendBeaconExportDelegate will be removed in a future version
+* fix(otlp-transformer): downgrade `protobufjs` to version `^7.0.0` [#6418](https://github.com/open-telemetry/opentelemetry-js/pull/6418) @vitorvasc
 
 ### :books: Documentation
 
diff --git a/experimental/packages/otlp-transformer/package.json b/experimental/packages/otlp-transformer/package.json
index 95c3358114e..e1250e98170 100644
--- a/experimental/packages/otlp-transformer/package.json
+++ b/experimental/packages/otlp-transformer/package.json
@@ -87,7 +87,7 @@
     "@opentelemetry/sdk-logs": "0.212.0",
     "@opentelemetry/sdk-metrics": "2.5.1",
     "@opentelemetry/sdk-trace-base": "2.5.1",
-    "protobufjs": "8.0.0"
+    "protobufjs": "^7.0.0"
   },
   "homepage": "https://github.com/open-telemetry/opentelemetry-js/tree/main/experimental/packages/otlp-transformer",
   "sideEffects": false
diff --git a/package-lock.json b/package-lock.json
index 5af17a42713..68bc33a4018 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1185,7 +1185,7 @@
         "@opentelemetry/sdk-logs": "0.212.0",
         "@opentelemetry/sdk-metrics": "2.5.1",
         "@opentelemetry/sdk-trace-base": "2.5.1",
-        "protobufjs": "8.0.0"
+        "protobufjs": "^7.0.0"
       },
       "devDependencies": {
         "@opentelemetry/api": "1.9.0",
@@ -1212,30 +1212,6 @@
         "@opentelemetry/api": "^1.3.0"
       }
     },
-    "experimental/packages/otlp-transformer/node_modules/protobufjs": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-8.0.0.tgz",
-      "integrity": "sha512-jx6+sE9h/UryaCZhsJWbJtTEy47yXoGNYI4z8ZaRncM0zBKeRqjO2JEcOUYwrYGb1WLhXM1FfMzW3annvFv0rw==",
-      "hasInstallScript": true,
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "@protobufjs/aspromise": "^1.1.2",
-        "@protobufjs/base64": "^1.1.2",
-        "@protobufjs/codegen": "^2.0.4",
-        "@protobufjs/eventemitter": "^1.1.0",
-        "@protobufjs/fetch": "^1.1.0",
-        "@protobufjs/float": "^1.0.2",
-        "@protobufjs/inquire": "^1.1.0",
-        "@protobufjs/path": "^1.1.2",
-        "@protobufjs/pool": "^1.1.0",
-        "@protobufjs/utf8": "^1.1.0",
-        "@types/node": ">=13.7.0",
-        "long": "^5.0.0"
-      },
-      "engines": {
-        "node": ">=12.0.0"
-      }
-    },
     "experimental/packages/sampler-composite": {
       "name": "@opentelemetry/sampler-composite",
       "version": "0.212.0",