diff --git a/dev_tools/requirements/deps/protos.txt b/dev_tools/requirements/deps/protos.txt
index fc4da6912ef..a933f260218 100644
--- a/dev_tools/requirements/deps/protos.txt
+++ b/dev_tools/requirements/deps/protos.txt
@@ -3,4 +3,4 @@
 # This bundles protoc 3.23.1, which we use for generating proto code.
 grpcio-tools~=1.56.0
 
-mypy-protobuf==3.4
\ No newline at end of file
+mypy-protobuf==3.3
\ No newline at end of file