diff --git a/skeleton/requirements.txt b/skeleton/requirements.txt
index f588b3d..07d60bc 100644
--- a/skeleton/requirements.txt
+++ b/skeleton/requirements.txt
@@ -23,7 +23,7 @@ markupsafe==1.1.1         # via jinja2
 mock==3.0.5               # via tensorflow-estimator
 numpy==1.18.4             # via h5py, keras-applications, keras-preprocessing, opencv-contrib-python, skeleton (setup.py), tensorboard, tensorflow, tensorflow-estimator
 opencv-contrib-python==3.4.9.33  # via skeleton (setup.py)
-protobuf==3.11.3          # via tensorboard, tensorflow
+protobuf==3.18.3          # via tensorboard, tensorflow
 pyyaml==5.3.1             # via skeleton (setup.py)
 requests==2.23.0          # via skeleton (setup.py)
 six==1.14.0               # via absl-py, grpcio, h5py, keras-preprocessing, mock, protobuf, tensorboard, tensorflow, tensorflow-estimator