diff --git a/covid-inference/requirements.txt b/covid-inference/requirements.txt
index d77da3a..8fe95f6 100644
--- a/covid-inference/requirements.txt
+++ b/covid-inference/requirements.txt
@@ -35,7 +35,7 @@ opencv-python==4.2.0.34
 opt-einsum==3.2.1
 pandas==1.0.3
 Pillow==6.2.2
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycodestyle==2.5.0