diff --git a/source/codegen/validate_examples.py b/source/codegen/validate_examples.py
index 1bc2abc12..c23312f5d 100644
--- a/source/codegen/validate_examples.py
+++ b/source/codegen/validate_examples.py
@@ -61,7 +61,7 @@ def _validate_examples(
     with _create_stage_dir(staging_dir):
         _system("poetry new .")
         _system("poetry add grpcio")
-        _system("poetry add --dev grpcio-tools mypy mypy-protobuf types-protobuf grpc-stubs")
+        _system("poetry add --dev grpcio-tools mypy~=1.14 mypy-protobuf~=3.5 types-protobuf==5.29.1.20241207 grpc-stubs")
         _system("poetry add --dev black==23.3.0")
         _system("poetry install")