diff --git a/contract-tests/images/mock-collector/pyproject.toml b/contract-tests/images/mock-collector/pyproject.toml
index 422e2a5b1..748cc516f 100644
--- a/contract-tests/images/mock-collector/pyproject.toml
+++ b/contract-tests/images/mock-collector/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "grpcio ~= 1.66.0",
     "opentelemetry-proto==1.25.0",
     "opentelemetry-sdk==1.25.0",
-    "protobuf==4.25.2",
+    "protobuf==4.25.8",
     "typing-extensions==4.12.2"
 ]
 
diff --git a/contract-tests/images/mock-collector/requirements.txt b/contract-tests/images/mock-collector/requirements.txt
index a0c5454cd..69ddf8205 100644
--- a/contract-tests/images/mock-collector/requirements.txt
+++ b/contract-tests/images/mock-collector/requirements.txt
@@ -1,5 +1,5 @@
 grpcio==1.66.2
 opentelemetry-proto==1.25.0
 opentelemetry-sdk==1.25.0
-protobuf==4.25.2
+protobuf==4.25.8
 typing-extensions==4.12.2