diff --git a/test_requirements.txt b/test_requirements.txt
index 0ea4310a..43a6d5f1 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1,6 +1,6 @@
 # Requirements to run unit tests. Tests import from
 # generated code.
-protobuf==6.32.1
+protobuf==6.33.2
 pytest==8.4.2
 types-grpcio==1.0.0.20251009
 pytest-asyncio==0.25.3