diff --git a/requirements.bazel.txt b/requirements.bazel.txt
index aab48484..41a772d5 100644
--- a/requirements.bazel.txt
+++ b/requirements.bazel.txt
@@ -4,7 +4,7 @@
 coverage>=4.0
 cython==0.28.3
 enum34>=1.0.4
-protobuf==3.5.0.post1
+protobuf==3.18.3
 six>=1.10
 wheel>=0.29
 futures>=2.2.0