diff --git a/g-cloud/requirements.txt b/g-cloud/requirements.txt
index 54cb0b2..8ecdf43 100644
--- a/g-cloud/requirements.txt
+++ b/g-cloud/requirements.txt
@@ -176,7 +176,7 @@ pluggy==0.13.1
 ply==3.11
 prometheus-client==0.7.1
 prompt-toolkit==3.0.3
-protobuf==3.12.2
+protobuf==3.18.3
 psutil==5.6.7
 ptyprocess==0.6.0
 py==1.8.1