diff --git a/test_requirements.txt b/test_requirements.txt
index dc658798..72cb9ad2 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1,6 +1,6 @@
 # Requirements to run unit tests. Tests import from
 # generated code.
-protobuf==4.25.3
+protobuf==5.26.1
 pytest==7.4.3
 pytest-asyncio==0.23.6
 grpc-stubs==1.53.0.2